About 13% of these are Testing Equipment. The schematic symbol, of the transducer is as shown in figure 1(a) and the TK294K in figure 1(b). The transducer used for the measurements is/are A. The method may further include the additional step of comparing the phase angle of the vector-summed signal with the phase angle of either exciting voltage and producing a pulse-width-modulated square-wave output signal at the excitation frequency as a function of such phase comparison. There are many devices for sensing and determining the position of a movable member. 2. 16. The linear variable differential transformer (LVDT) (also called linear variable displacement transformer, linear variable displacement transducer, or simply differential transformer) is a type of electrical transformer used for measuring linear displacement (position). The first and second voltages may be phase-shifted by 90°, or by some other angle. The resistive transducer is used for measuring the physical quantities like temperature, displacement, vibration etc. 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. Other types of devices include variable-phase output signal devices, such as resolvers. together with the specification, and are to be considered a portion of the entire written description of this invention. The method of producing a digital output signal proportional to a change in a sensed physical parameter, comprising the steps of: providing a first pair of series-connected resistors; providing a second pair of series-connected resistors; arranging said resistors such that the electrical resistance of at least one of said resistors is variable in response to a change in said sensed parameter; applying a first exciting alternating voltage at a particular frequency across said first pair; applying a second exciting alternating voltage at said frequency across said second pair; 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. The phase comparator is arranged to sense and determine the phase of the vector-sum signal with respect to the reference waveform. The present invention broadly provides an improved variable-phase resistive transducer, and a method of operating same. The process of variation in resistance is widely used in the industrial applications. Another object is to provide a variable-phase resistive transducer. 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. 1. •The variable resistance transducers are also called as resistive transducers or resistive sensors. ρ – the resistivity of the conductor in materials in ohm meter. These and other objects and advantages will become apparent from the foregoing and ongoing written specification, the drawings, and the appended claims. The capacitive transducer consists of two parallel metal plates that are separated by the dielectric material such as air. Required fields are marked *. A method as set forth in claim 10 wherein at least one of said resistors is a strain gauge. resistive , capacitive and inductive transducers) Resistive Transducer Resistive transducers are those in which the resistance change due to the change in some physical phenomenon . 6. Difference Between Transducer & Inverse Transducer, Difference Between Concave and Convex Lens, Armature Reaction in a Synchronous Machine, Two Wattmeter Method of Power Measurement, Difference Between Conduction and Convection, Difference Between Circuit Switching and Packet Switching, Difference Between Static and Kinetic Friction, Difference Between Ductility and Malleability, Difference Between Physical and Chemical Change, Difference Between Alpha, Beta and Gamma Particles, Difference Between Electrolytes and Nonelectrolytes, Difference Between Electromagnetic Wave and Matter Wave. This does not occur in all circumstances. 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). MOOG INC., NEW YORK, Free format text: The time between zero crossings of the vector-summed and reference signals is then counted to provide the digital output of the transducer. 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. 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). ANSWER: A. Inductive transducer . A – cross-section area of the conductor in meter square. The linear variable differential transformer transducer is ... D. Resistive transducer View Answer / Hide Answer. Still another object is to provide an improved method of operating a transducer to provide a digital output signal. Unless otherwise indicated, the terms "inwardly" and "outwardly" refer to the orientation of a surface relative to its axis of elongation, or axis or rotation, as appropriate. Resistive Transducers 1. Variable-phase resistive transducer, and method of operating same. The variable resistance transducers are also called as resistive transducers or resistive sensors. 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. A transducer as set forth in claim 1 wherein each of said waveforms is a sine wave. 17. However, this is not invariable. 13. Sine wave generators 31 and 32 are operatively arranged to generate identical alternating waveforms (i.e., either sine waves, cosine waves, triangular waves, sawtooth waves or any other alternating waveform having a repetitive zero crossing) of like function and frequency. In another aspect, the invention provides an improved method of producing a digital output signal proportional to a change in a sensed physical parameter, which method comprising the steps of: providing a first pair of series-connected resistors; providing a second pair of series-connected resistors; arranging the resistors such that the electrical resistance of at least one of the resistors is variable in response to a change in the sensed parameter; applying a first exciting alternating voltage at a particular frequency across the first pair; applying a second exciting alternating voltage at the same frequency across the second pair; the first and second exciting voltages having identical waveforms (i.e., as to general waveshape and frequency), but being shifted relative to one another by a constant phase angle (Ï); vector-summing the voltage existing at a point between the resistors of the first pair with the voltage existing a point between the resistors of the second pair to provide a vector-summed output signal; and counting the time difference between the occurrence of a distinguishing event (e.g., a zero crossing) of the vector-summed signal and the occurrence of a like distinguishing event of the exciting voltage referred to; thereby to provide a digital output signal proportional to the change in the sensed physical parameter. The variable resistance transducers are also called as resistive transducers or resistive sensors. 8. A variable resistor is in essence an electro-mechanical transducer and normally works by sliding a contact (wiper) over a resistive element. An a.c. current is provided to the driving coil. MARINE MIDLAND BANK, AGENT, NEW YORK, Free format text: A wide variety of variable resistive load bank options are available to you, such as brand name, rated power, and temperature coefficient. 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 resistive transducer can work both as the primary as well as the secondary transducer. SECURITY AGREEMENT;ASSIGNOR:MOOG INC.;REEL/FRAME:009748/0230, Free format text: This EzEd Video explains Resistive Transducers The circuit Consists of Slider to give Zero output and Full output. 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. A transducer as set forth in claim 1 wherein the amplitudes of said exciting voltages are the same. 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. Transducer - MCQs with answers Q1. This output time count is inherently a digital value. Definition: The capacitive transducer is used for measuring the displacement, pressure and other physical quantities. 12. The voltages between the resistors of each pair are vector-summed. A method as set forth in claim 10 wherein the amplitudes of said exciting voltages are the same. A transducer as set forth in claim 1 wherein at least one variable resistor is a strain gauge. If any system component produces an analog output signal, this signal must first be converted to its digital equivalent, before it may be integrated in the control scheme. Summing point 18 also receives a triangular wave from triangular reference generator 19. Resistive Type of Sensors - Their Analysis and Applications Debasmit Das 10115039 Batch : E3 2. Example – The circuit of the sliding resistive transducer is shown in the figure below. However, the second excitation voltage is phase-shifted relative to the first excitation voltage by a known and constant phase angle (Ï), such as 90°. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). In modern digital control techniques, this analog signal must first be converted to a digital equivalent prior to use. The currents induced in the driven coils are reflective of the relative position of the core member, and the output signals of the driven coils are analog values of the driving signal. Transducer Output is Proportional to the Displacement. 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. Only one resistor of the bridge need be sensitive to a change in the parameter. Active transducers … simply refer to the orientation of the illustrated structure as the particular drawing figure faces the reader. A variable reluctance sensor (commonly called a VR sensor) is a transducer that measures changes in magnetic reluctance. The resistive transducers are also known as resistive sensors or variable resistance transducers. 2 is a schematic view of the improved variable-phase resistive transducer, showing the application of two phase-shifted sinusoidal-like exciting voltages to separate series-connected resistor pairs, with the voltages at the nodes between the resistors of each pair being vector-summed and convened to a pulse-width-modulated square-wave signal, and the time difference between the occurrence of a … The process of variation in resistance is widely used in the industrial applications. These transducers are usually used as the secondary transducers, where the output from the primary mechanical transducer acts as the input for the variable resistance transducer. For example, a linear variable differential transformer ("LVDT") typically has a primary coil that is inductively coupled to two secondary or output coils via an intermediate movable core member. 3. The outputs of these coils are coupled to an output coil through the position of the core. Owner name: The resistive transducer gives the fast response. 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. Said exciting voltages is 90° to the orientation of the metal,,. Some angle other than 90°, as desired the specification, the first and second voltages... Etc. resistance is widely used in the form of a prior art transducer. 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