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A versatile interface circuit for capacitive and resistive sensors
(2017-12-13)
Petchmaneelumka, Wandee
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Mano, Pitsini
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Wutikun, Tanatat
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Riewruja, Vanchai
This paper presents a circuit design technique for realization of a versatile interface circuit for capacitive and resistive sensors. The proposed method is based on the use of operation of relaxation oscillator. Time periods generated from two relaxation oscillators are employed for the reference signal and another sensing signal from sensor. The output signal obtained in the form of time period is proportional to the sensing value from sensor. The proposed approach provides the attraction in terms of simple configuration and low cost. The proposed circuit performances confirmed by the experimental results using commercial devices are agreed with the expected values.
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Simple capacitance-to-time converter
(2017-02-18)
Petchmaneelumka, Wandee
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Wutikun, Tanatat
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Rerkratn, Apinai
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Riewruja, Vanchai
A method for implementing of a capacitive sensor interfacing circuit is proposed in this paper. The time period generated from a simple relaxation oscillator is utilized to determine the time period obtained from the capacitive sensor. The output parameter of the proposed converter is in the form of the time period. The capacitance of the sensor can then be calculated using ratio metric operation. The proposed converter can linearly convert the capacitance from the sensor to the time period. The purpose of the proposed converter plays an attention in terms of simple configuration and low cost. Performance of the proposed scheme is demonstrated by experimentally implementation. The resulting confirmed that the performance of the proposed converter is in good agreement with the expected value.
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Interface circuit using operational conveyors for differential resistive sensors
(2013-09-02)
Julsereewong, Amphawan
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Julsereewong, Prasit
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Rungkhum, Tipparat
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Sasaki, Hirofumi
In this paper, a simple and accurate circuit for interfacing differential resistive sensors is presented. The realization method employs three operational conveyors as active elements to provide voltage output linearly proportional to sensing resistance change. The performance is confirmed through PSPICE simulation and experimental results. © 2013 IEEE.
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Simple resistance-to-frequency converter with lead-wire-resistance compensation
(2013-03-28)
Julsereewong, Amphawan
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Petchmaneelumka, Wandee
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Rungkhum, Tipparat
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Yahara, Mitsutoshi
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Fujimoto, Kuniaki
This article presents a simple technique to realize a resistance-to-frequency converter for single resistive sensor-based remote measurements. The proposed realization method uses commercially available devices to generate output frequency, which is linearly proportional to sensing resistance deviation. Experimental results are shown that not only the good circuit operation but also the effective lead-wire-resistance compensation of the proposed technique can be obtained. © 2013 ICIC International.
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Simple interface circuit for resistive/capacitive sensors
(2013-01-01)
Tongcharoen, Jakkapun
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Petchmaneelumka, Wandee
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Cheypoca, Thepjit
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Rerkratn, Apinai
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Riewruja, Vanchai
This paper presents a method to realize interface circuit for resistive and capacitive sensors. The proposed circuit employs commercially available devices to generate the output signal in form of time period, which is linearly proportional to the both of sensing resistance and capacitance. Circuit configuration is simple and small in size. Experimental results verifying the performances of the proposed circuit are also included.
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Simple interface circuit with lead-wire-resistance compensation for single resistive sensors
(2012-12-01)
Petchmaneelumka, Wandee
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Julsereewong, Prasit
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Julsereewong, Amphawan
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Tongpakpanang, Jaturon
A simple interface circuit for single resistive sensor-based remote measurements is presented. The realization method using commercially available devices provides not only the output signal linearly related to resistive sensor changes but also the compensation of effect due to lead-wire resistances. Performance of the proposed circuit is confirmed through experimental results. © 2012 ICROS.
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Simple resistance-to-period converter for resistive sensors
(2012-12-01)
Tongpakpanang, Jaturon
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Rerkratn, Apinai
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Kaewpoonsuk, Anucha
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Riewruja, Vanchai
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Petchmaneelumka, Wandee
A method for realization of resistance-to-period converter is introduced in this article. The principle of converter utilizes the behavior of designed astable multivibrator, which is implemented using commercial available and low cost devices. The operation of proposed converter circuit is in current mode. Therefore, the resistance is linearly converted to period and also converted to frequency with invert proportional relationship. The conversion gain of the proposed converter can be adjusted by electronic means. The configuration of the proposed converter is simple and small in size. Experimental results verifying the proposed converter performance are included in detail. The relative error of about 0.8 % is observed. © 2012 ICROS.
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Resistive sensor interface circuits using operational conveyor and operational amplifier
(2012-03-01)
Julsereewong, Amphawan
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Julsereewong, Prasit
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Rungkhum, Tipparat
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Sasaki, Hirofumi
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Isoguchi, Hiroshi
A simple technique based on commercially available devices to implement three interface circuits for both differential resistive sensors and single resistive sensors is presented in this article. Each proposed scheme uses an operational conveyor and an operational amplifier as active elements. Surpassing the previously reported circuits, the proposed circuits provide not only simpler structures but also higher accuracy. Performances of the proposed circuits are verified through computer simulations. © 2012 ICIC International.
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Simple linearization technique for remotely measuring resistance changes
(2011-08-01)
Julsereewong, Amphawan
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Julsereewong, Prasit
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Rungkhum, Tipparat
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Sasaki, Hirofumi
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Isoguchi, Hiroshi
A simple linearization technique for remotely measuring resistance changes of single-element resistive-type sensors is presented in this article. The proposed circuit configuration uses commercially available devices to generate the output voltage, which is linearly proportional to the sensing resistance change. PSPICE simulation results are included to confirm not only the good operation but also the effective lead-resistance compensation of the proposed technique.
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Interface circuit for single active element resistive sensors
(2010-10-01)
Julsereewong, Amphawan
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Julsereewong, Prasit
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Rungkhum, Tipparat
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Sasaki, Hirofumi
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Isoguchi, Hiroshi
This article presents an effective method to realize interface circuit for single active element resistive sensors. The realization is composed of op-amp in conjunction with current conveyors. Surpassing the previous circuit using only single current conveyor, the proposed configuration affords significant improvement in accuracy. PSPICE simulation results are used to confirm the performance of the proposed circuit. © 2010 ICIC International.

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