Simple linearization of measurement based on photovoltaic voltage

Changsheng Li

doi:10.1117/12.806739

13 October 2008 Simple linearization of measurement based on photovoltaic voltage

Changsheng Li

Proceedings Volume 7128, Seventh International Symposium on Instrumentation and Control Technology: Measurement Theory and Systems and Aeronautical Equipment; 71281S (2008) https://doi.org/10.1117/12.806739
Event: Seventh International Symposium on Instrumentation and Control Technology, 2008, Beijing, China

Abstract

Based on the logarithmic relationship between photovoltaic voltage and incident light intensity of a photo-detector, a simple and low-cost method is proposed to linearize the measurement of nonlinear variables related to light intensity. Theoretical analysis shows that this linear measurement method is feasible in a large measurement range if we choose a proper load resistance for the photodiode. Based on the Lambert-Beer law and the photovoltaic voltage-based measurement method, the linear measurements of liquid level and liquor concentration have been achieved experimentally by directly detecting the output voltage of a solar cell, and their nonlinearities are both less than 2.0%.

Citation Download Citation

Changsheng Li "Simple linearization of measurement based on photovoltaic voltage", Proc. SPIE 7128, Seventh International Symposium on Instrumentation and Control Technology: Measurement Theory and Systems and Aeronautical Equipment, 71281S (13 October 2008); https://doi.org/10.1117/12.806739

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