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A linear, millimetre displacement-to-frequency transducer.

Agee JT, Petto FK - Sensors (Basel) (2012)

Bottom Line: Experimental results confirm that a displacement of 0-100 mm is converted into a frequency range of 0-100 kHz, with a normalised fidelity factor of 99.91%, and a worst-case nonlinearity of less than 0.08%.Tests using laboratory standards show that a displacement of 10 mm is transduced with an accuracy of ± 0.6%, and a standard deviation of 530 Hz.Estimates included in the paper show that the transducer could cost less than 1% of existing systems for millimeter displacement measurement.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical Engineering, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa. ageejt@tut.ac.za

ABSTRACT
The paper presents a novel linear, high-fidelity millimetre displacement-to-frequency transducer, based on the resistive conversion of displacement into a proportional voltage, and then frequency. The derivation of the nonlinearity, fidelity and sensitivity of the transducer is presented. Experimental results confirm that a displacement of 0-100 mm is converted into a frequency range of 0-100 kHz, with a normalised fidelity factor of 99.91%, and a worst-case nonlinearity of less than 0.08%. Tests using laboratory standards show that a displacement of 10 mm is transduced with an accuracy of ± 0.6%, and a standard deviation of 530 Hz. Estimates included in the paper show that the transducer could cost less than 1% of existing systems for millimeter displacement measurement.

No MeSH data available.


Equivalent millimeter output from frequency measurements.
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f12-sensors-12-10820: Equivalent millimeter output from frequency measurements.

Mentions: The experimental setup is shown in Figure 7. For the experiments, a slide wire potentiometer was used as the submeter displacement sensor. It had a maximum displacement dT = 100 mm = 10−1 m, and a total resistance of 11.2 kΩ (instead of the design maximum resistance of 10 kΩ). The potentiometer was supplied by a 1volt DC supply. The Thevenin voltage of the sensor, as a function of displacement, is shown in Figure 8. A plot of the amplified sensor voltage as function of detected displacement is shown in Figure 9. The overall displacement-to-frequency transduction is shown in Figure 10. For the analysis of the accuracy and precision of transducing displacement inputs into frequency, repeated measurements of 10 mm displacement were undertaken. The results are shown in Figures 11 and 12.


A linear, millimetre displacement-to-frequency transducer.

Agee JT, Petto FK - Sensors (Basel) (2012)

Equivalent millimeter output from frequency measurements.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472859&req=5

f12-sensors-12-10820: Equivalent millimeter output from frequency measurements.
Mentions: The experimental setup is shown in Figure 7. For the experiments, a slide wire potentiometer was used as the submeter displacement sensor. It had a maximum displacement dT = 100 mm = 10−1 m, and a total resistance of 11.2 kΩ (instead of the design maximum resistance of 10 kΩ). The potentiometer was supplied by a 1volt DC supply. The Thevenin voltage of the sensor, as a function of displacement, is shown in Figure 8. A plot of the amplified sensor voltage as function of detected displacement is shown in Figure 9. The overall displacement-to-frequency transduction is shown in Figure 10. For the analysis of the accuracy and precision of transducing displacement inputs into frequency, repeated measurements of 10 mm displacement were undertaken. The results are shown in Figures 11 and 12.

Bottom Line: Experimental results confirm that a displacement of 0-100 mm is converted into a frequency range of 0-100 kHz, with a normalised fidelity factor of 99.91%, and a worst-case nonlinearity of less than 0.08%.Tests using laboratory standards show that a displacement of 10 mm is transduced with an accuracy of ± 0.6%, and a standard deviation of 530 Hz.Estimates included in the paper show that the transducer could cost less than 1% of existing systems for millimeter displacement measurement.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical Engineering, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa. ageejt@tut.ac.za

ABSTRACT
The paper presents a novel linear, high-fidelity millimetre displacement-to-frequency transducer, based on the resistive conversion of displacement into a proportional voltage, and then frequency. The derivation of the nonlinearity, fidelity and sensitivity of the transducer is presented. Experimental results confirm that a displacement of 0-100 mm is converted into a frequency range of 0-100 kHz, with a normalised fidelity factor of 99.91%, and a worst-case nonlinearity of less than 0.08%. Tests using laboratory standards show that a displacement of 10 mm is transduced with an accuracy of ± 0.6%, and a standard deviation of 530 Hz. Estimates included in the paper show that the transducer could cost less than 1% of existing systems for millimeter displacement measurement.

No MeSH data available.