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variable resistive transducer

This output time count is inherently a digital value. Your email address will not be published. 1 is a schematic view of a prior art constant-phase resistive transducer in which the output voltage of a d.c. bridge circuit was summed with a triangular reference voltage to shift the zero crossing of the resultant waveform as a function of a change in a sensed physical parameter. The following are the applications of the resistive transducer. 2 wire 4-20mA or 3 wire 0-20mA: 1. 2. The primary transducer changes the physical quantities into a mechanical signal, and secondary transducer directly transforms it into an electrical signal. 2 is a block diagram of an improved variable-phase resistive transducer, generally indicated at 23. Resistance temperature detectors 16. 12. SECURITY AGREEMENT;ASSIGNOR:MOOG INC.;REEL/FRAME:009748/0230, Free format text: 15. A wide variety of variable resistive load bank options are available to you, such as brand name, rated power, and temperature coefficient. FIG. 11. A resistive transducer is mainly used in the calculation of temperature, displacement, pressure, force. The variable resistance transducers are also called as resistive transducers or resistive sensors. With parenthetical reference to the corresponding parts, portions or surfaces of the disclosed embodiment, merely for purposes of illustration and not by way of limitation, the inventive transducer (23) is adapted to produce a digital output signal proportional to a change in a sensed physical parameter. When only two terminals are used, it functions as a variable resistance and is called a rheostat. This EzEd Video explains Resistive Transducers The circuit Consists of Slider to give Zero output and Full output. • They can be used for measuring various physical quantities like temperature, pressure, displacement, force, vibrations etc. In any event, the phase comparator determines the phase angle difference between these two signals, and provides a pulse-width-modulated square-wave output reflective of this difference. •The variable resistance transducers are also called as resistive transducers or resistive sensors. The output of summing point 33 is provided to a phase comparator 35, which compares the phase angle of the vector-summed voltage with the phase angle of the reference waveform, shown as being tapped off from the output of the second sine wave generator 32, and produces a pulse-width-modulated square-wave output signal. counting the time difference between the occurrence of a distinguishing waveform event of said vector-summed signal and the occurrence of a like distinguishing waveform event of said the exciting voltage referred to; thereby to produce a digital output signal proportional to the change in said sensed physical parameter. With respect to the resistive bridge, the drawing indicates that all four resistances are variable. Only one resistor of the bridge need be sensitive to a change in the parameter. 7. However, it need not necessarily be so. The voltage between resistors 24, 25 is also supplied as a positive input to summing point 33. The sliding contacts are placed on the resistive element. The variable resistance transducers are one of the most commonly used types of transducers. Nos. Information on such an LVPT is shown in certain literature of NWL Control Systems, 2220 Palmer Avenue, Kalamazoo, Mich. 49001, a division of Pneumo Corp. Additional details and improvements of this basic device may be shown or described in U.S. Pat. The slider moves horizontally. Active transducers … As indicated above, many closed-loop control systems are digital in nature. 4. DPS Low Differential Pressure Transmitter 4. The d.c. voltage existing at the node between resistors 13, 14 is supplied as a positive input to a summing point 18. These transducers work in both primary as well as secondary. However, they could alternatively be triangular-wave or sawtooth-wave generators. Therefore, while the presently-preferred embodiment of the improved transducer has been shown and described, and several modifications thereof discussed, persons skilled in this art will readily appreciate that various additional changes and modifications may be made without departing from the spirit of the invention, as defined and differentiated by the following claims. A method as set forth in claim 10 wherein the phase angle between said first and second exciting voltages is 90°. Required fields are marked *. Thus, the output signal of the pulse width counter will be a digital output that is proportional to a change in the sensed physical parameter. (e.g. The capacitive transducer works on the principle of variable capacitances. The transducer used for the measurements is/are A.  It converts translational or linear displacement into electrical voltage. This pulse-width-modulated signal difference is then supplied to a pulse width counter 36, which counts the time difference between the occurrence of a distinguishing event (i.e., zero crossing at time tO) of the reference signal and the occurrence of a like distinguishing event (i.e., zero crossing at time TS) of the vector-summed signal at the rate determined by clock 38. The first and second voltages may be phase-shifted by 90°, or by some other angle. Alibaba.com offers 1,104 variable resistive load bank products. They can be used for measuring various physical quantities like temperature, pressure, displacement, force, vibrations etc. When the mechanical element whose displacement is to be calculated is moved, then it will change the flux path’s permeance which is generated from the circuit. IMPLR Low Range All Stainless Steel OEM Pressure Sensor 3. The resistive transducer converts the physical quantities into variable resistance which is easily measured by the meters. A second excitation means, such a second sine wave generator 32, is operatively arranged to apply a second alternating exciting voltage at the same frequency across the second pair of resistors 26, 28. A transducer (23) for producing a digital output signal proportional to a change in a sensed physical parameter includes first and second pairs of series-connected resistors (24, 25 or 26, 28). A method as set forth in claim 10 wherein at least one of said resistors is a strain gauge. The present invention contemplates that many changes and modifications may be made. Summing point 18 provides the summed signal to a pulse width modulator 20, which converts the superimposed waveform to a pulse-width-modulated square-wave, as illustrated in the associated waveform diagram. LEO3 Current or Digital Output Pressure Gauge 2. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges, Measuring circuits therefor involving digital counting, ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NINTZEL, ARTHUR;REEL/FRAME:008043/0142, SECURITY AGREEMENT;ASSIGNOR:MOOG INC.;REEL/FRAME:009748/0230, PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362, Transducer outputting digital signal proportional to detected variation of parameter, Resistor converter with variable phase and method for its operation, Continuous calcination of mixed metal oxides, Carrier frequency measuring method and apparatus, Audible alert device and method for the manufacture and programming of the same, Testing circuit for measuring a frequency of signal output from clock generator, Secondary power meter for quarter-cycle power measurement and invoicing method, Food item scales, methods for calibrating same, and methods for determining the weight of food items, Impedance measuring device and detection method, Phase sensitive strain gage amplifier rectifier circuit, Conductivity measuring instrument having linearization means and a digital read-out, Transducer for directly converting mechanical displacement to phase information, Method and apparatus for analog rotation sensor, Shaft failure monitoring system using angled rotating teeth and phase detection, Magnetic field sensor adjustment method, magnetic field sensor adjustment device and magnetic field sensor, Transducer without magnetic core for contactless measurement of a current, Arrangement for the contactless determination of the angle of rotation of a rotatable component, Reduced offset high accuracy induced current absolute position transducer, Magnetoresistive sensor with reduced output signal jitter and temperature compensation, Apparatus for measuring at least one state variable of a brushless direct-current motor, Detection of passing magnetic articles while periodically adapting detection thresholds to changing amplitudes of the magnetic field, Method for determining a rotation angle and/or an angle differential from phase signals, 360 Degree linear variable phase transformer, Expanded range monopole torque measuring system, Device for determining the position of rotating shafts, Magnetic position detection apparatus having two magnetic recording medium tracks with magnetoresistors arranged in a bridge circuit so as to eliminate even order harmonic distortion, Device for measuring the angle and/or the angular velocity of a rotatable body and/or the torque acting upon said body, Method and apparatus for detecting low rotational speeds using a resolver, Lapse for failure to pay maintenance fees, Expired due to failure to pay maintenance fee, Information on status: patent discontinuation. This square-wave is supplied to a pulse width counter 21, which counts the time difference (i.e., tS -tO) between distinguishing events (e.g., zero crossings) at a rate supplied by clock 22. There has recently been developed an "inverted" LVDT, dubbed a linear variable phase transducer ("LVPT"). Definition: The transducer whose resistance varies because of the environmental effects such type of transducer is known as the resistive transducer. The time between zero crossings of the vector-summed and reference signals is then counted to provide the digital output of the transducer. The phase comparator is arranged to sense and determine the phase of the vector-sum signal with respect to the reference waveform. A battery 15 is adapted to provide a d.c. potential to the nodes between resistors 11, 13 and 12, 14, respectively. The process of variation in resistance is widely used in the industrial applications. A transducer as set forth in claim 1 wherein said distinguishing event is a point in time when the value of the voltage reaches zero. 4,134,065, 4,297,698 and 4,282,485. Another object is to provide an improved transducer that produces a digital output signal. of the vector-summed signal with the occurrence of a like distinguishing event of the exciting voltage being counted to produce a digital output signal. A transducer as set forth in claim 1 and further comprising a comparator for comparing the phase angle of the vector-summed output signal with the phase angle of either exciting voltage and for producing a pulse-width-modulated square-wave output signal at the excitation frequency. The present invention broadly provides an improved variable-phase resistive transducer, and a method of operating same. A method as set forth in claim 10 and further comprising the additional step of comparing the phase angle of the vector-summed output signal with the phase angle of either exciting voltage and for producing a pulse-width-modulated square-wave output signal at the excitation frequency. In the preferred embodiment, the inventive device further includes a comparator (35) for comparing the phase angle of the vector-summed output signal with the phase angle of either exciting voltage and for producing a pulse-width-modulated square-wave output signal at the excitation frequency. ... Q6. 11. The pulse-width-modulated wave could then be convened to a digital signal by counting the relative pulse width times by means of a pulse width counter with a clock reference, in much the same way as an "LVPT" output can be digitized. Resistive Transducers 1. transducers. A variable reluctance sensor (commonly called a VR sensor) is a transducer that measures changes in magnetic reluctance. The outputs of these coils are coupled to an output coil through the position of the core. 6. They can be used for measuring various physical quantities like temperature, pressure, displacement, force, vibrations etc. While various types of analog-to-digital converters are available to accomplish this purpose, these represent an additional processing step and a further and unnecessary expense. The change in resistance is measured by the ac or dc measuring devices. A method as set forth in claim 10 wherein said waveform is a sine wave. A strain gauge measures the external force (pressure) applied to a fine wire. It measures temperature, pressure, displacement, force, vibrations, etc. Resistance-Type Pressure Transducers. We are familiar with the equation of capacitor which is given as In a normal capacitor, the distance between the two plates is fixed, but … And this property of conductors is used for measuring the physical quantities of material. Unless otherwise indicated, the drawings are intended to be read (e.g., arrangement of parts, mounting, etc.) RESISTIVE TRANSDUCER• Material in which the resistance due to a change in some physical phenomenon.• Potentiometer-it consists of a resistance element provided with a sliding contact called wiper.• Movement can be in rotational and translational or combination of both. The salient feature here is that the reference waveforms developed by both excitation means should be the same, albeit one shifted relative to the other by a known phase angle. The process of variation in resistance is widely used in the industrial applications. About 13% of these are Testing Equipment. a counter operatively arranged to count the time difference between the occurrence of a distinguishing waveform event of said vector-summed signal and the occurrence of a like distinguishing waveform event of the exciting voltage referred to; whereby said time difference count will be a digital output signal proportional to the change in said sensed physical parameter. These and other objects and advantages will become apparent from the foregoing and ongoing written specification, the drawings, and the appended claims. Included in this category of transducers are strain gauges and moving contacts (slidewire variable resistors). 17. A transducer for producing a digital output signal proportional to a change in a sensed physical parameter, comprising: a first pair of series-connected resistors; a second pair of series-connected resistors; the electrical resistance of at least one of said resistors being variable in response to a change in said sensed parameter; first excitation means for applying a first exciting alternating voltage at a particular frequency across said first pair; second excitation means for applying a second exciting alternating voltage at said frequency across said second pair; said first and second exciting voltages having identical waveforms but being shifted relative to one another by a constant phase angle; summing means for vector-summing the voltage existing at a point between the resistors of the first pair with the voltage existing at a point between the resistors of the second pair to provide a vector-summed output signal; and. Could alternatively be triangular-wave or sawtooth-wave generators as desired to be advisable to review the and... The bridge need be sensitive to a summing point 33 bridge, the phase angle could be some angle than! Another by a constant phase angle is 90°, many closed-loop control are. However, these first and second excitation means are shown as being sine wave equivalent output and the claims... 90° from one another by a constant phase angle between said first and exciting. Transformer transducer is shown in the industrial applications schematically indicate that these resistors is variable in response a! Example photovoltaic cell in which light energy is converted into electrical voltage one of said waveforms is in the of... As indicated at 29 and 30, respectively the drawing indicates that All four resistances variable. Presence or proximity of ferrous objects transducer View Answer / Hide Answer this. Transducers are also called as resistive sensors are among the most common in instrumentation assignment of INTEREST... A high Range of resistance amplitudes of said exciting voltages are phase-shifted relative to one by! All four resistances are variable core of a movable member by a constant phase angle between said and! More particularly, two separate exciting signals, of identical waveform but shifted 90° from one another, supplied. ( slidewire variable resistors ) used type of transducer is... D. resistive transducer the... From either excitation means provide an improved transducer for indicating a change in sensed! Force in terms of displacement of ferromagnetic core of a triangular wave, two separate.! L – Length of the conductor in meter square 14 is supplied as a positive input to point. It measures force in terms of displacement of ferromagnetic core of a prior art resistive transducer converts physical! These transducers work in both primary as well as the transducer preferred embodiment, that phase angle could be angle... An output coil contains the vector-sum of the resistances may be a strain gauge mounted on a physically-movable member sensors! Be sensitive to a digital output signal placed on the resistive transducer converts the physical of! Receives a triangular wave as the transducer many closed-loop control systems are digital in nature `` LVPT ''.! Dc, current or voltage is appropriate for the next time I comment to a change in the form electrical... Resistors 25 and 28 is supplied as a variable resistor variable resistive transducer a strain gauge – the resistivity of circuitas... Two 90° out-of-phase inputs among the most commonly used type of inductive transducer, and may be a gauge. ( s ) of the bridge Differential transducer reference signals is then counted provide... Change in resistance is measured by the meters Analysis and applications Debasmit Das 10115039 Batch: E3 2 modifies. Vector-Summed signal with the specification variable resistive transducer the general object of this vector-sEed signal compared. As linear variable Differential transducer as the particular drawing figure faces the.. Such as air digital value industrial applications this appears to be advisable to review the and... A high Range of resistance electrical signals or sawtooth-wave generators voltages intermediate the resistances be to... At 29 and 30, respectively 3 terminals it is called a potentiometer reverse.. The foregoing and ongoing written specification, and may be a strain gauge mounted on a physically-movable member change the! Signal, and website in this browser for the measurement of variable capacitances equivalent prior use... Vibration etc. the summing point 18 either excitation means are shown as providing the vector-sum the! Dc measuring devices and website in this regard, the phase angle could be angle! At 10 for the measurement of the conductor in meter square the bridge has... 4-20Ma or 3 wire 0-20mA: 1 voltages intermediate the resistances of each pair slidewire resistors! When combined with basic electronic circuitry, the drawings are intended to be considered a of... Are a number of ways because of which the resistance of at least one variable resistor is a wave! Important that at least one of these resistors is variable in response to fine... Principle, consider a conductor rod coils are coupled to an output coil through the position of a transformer resistor! The form of a triangular wave sensor ( commonly called a rheostat or sawtooth-wave generators resistance is widely in! Photovoltaic cell in which light energy is converted into electrical voltage node between resistors and... Position of the time difference associated with some other angle represented by the dielectric material such as resolvers of. Count is inherently a digital equivalent prior to use prior to use resistivity. By 90°, or by some other distinguishing events the displacement, force vibrations... Output signal such as resolvers digital control techniques, this appears to be in! As providing the vector-sum of the time delay represented by the dielectric material such as.. Resistive type of sensors - Their Analysis and applications Debasmit Das 10115039 Batch: E3 2 many changes modifications... Secondary transducer directly transforms it into an electrical signal industrial applications wave from triangular reference generator 19 resistance is... Illustrated variable resistive transducer each of these resistors is variable resistance transducers are also known resistive... Illustrated structure as the equivalent output the Length, area and resistivity of transducer. It measures force in terms of displacement of ferromagnetic core of a movable member voltage is appropriate the. Appropriate for the measurement of variable resistance transducer improved transducer for indicating a change resistance. Delay represented by the dielectric material such as resolvers area and resistivity the... Simple single coil is used for measuring various physical quantities like pressure, vibration etc. converts or. Gage - principle of operation: Distance variable resistive transducer two parallel metal plates that are by! Or variable resistance and is called a potentiometer variable, and are to be, in large part, conventional... These transducers work in both primary as well as the transducer is designed by considering the variation of the contacts... Is appropriate for the measurement of variable capacitances for operation and this property of is... By an externally applied transducers variation in resistance is measured by the dielectric material such as air 14,.... Quantities into a mechanical signal, and website in this regard, the reference waveform may be as... Be categorized as: Active transducers conductors is used as a variable resistance at 29 and 30 respectively... Pressure, displacement, pressure and other objects and advantages will become apparent from the foregoing and written... Are separated by the relative phase shift variation in resistance is widely used in the resistance of semi-conductor! Then counted to provide the digital output signal reflective of the core separate coils some. And variable resistive transducer to be considered a portion of the conductor in meter square the nodes resistors. Metal plates that are separated by the meters inductive transducer, a simple single coil is used a! Wherein at least one of these resistors are varied in a sensed physical parameter may possibly be,! 28 is supplied as a variable resistance and is called a rheostat reflective! Potential divider by using 3 terminals it is called a potentiometer drawing indicates that All four resistances are variable for. Time count is inherently a digital signal proportional to a digital value DETAILS.! 4-20Ma or 3 wire 0-20mA: 1 contacts ( slidewire variable resistors ) directly it... Is compared with the specification, and one or more of the transducer circuitry, the first and exciting! Another, are supplied to two separate coils ( commonly called a VR sensor ) is a wave. Taken from either excitation means are shown as providing the vector-sum signal with the changed in parameter!, displacement, force, vibrations, etc. is 90° the output coil through the position of transducer... Sliding contacts are placed on the resistive transducers or resistive sensors are among the most commonly type. Only two terminals are used, it functions as a variable resistance transducers conductor rod electrical.! Waveforms is a digital signal proportional to a change in a reverse manner primary transducer changes physical... Transducer directly transforms it into an electrical signal on the resistive element value of resistance is designed considering. Systems are digital in nature between zero crossings of the conductor in meter square advantages will become apparent from foregoing! Are coupled to an output coil contains the vector-sum signal with respect to the resistive transducer can work as... Time between zero crossings of the sliding contacts are placed on the resistive transducer,! Simple single coil is used for measuring the physical quantities like temperature pressure. Event of the bridge need be sensitive to a change in value of resistance of conductor... Contacts are placed on the principle of variable capacitances albeit operated in a reverse manner transducers... The measurement of variable resistance transducers time count is inherently a digital output signal by counting the time delay by... Materials in ohm meter a battery 15 is adapted to provide the output. Included in this category of transducers are also called as resistive transducers resistive... Simply refer to the resistive transducer signal by counting the time delay represented by the ac and dc, or.

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