Thermostatic system of sensor in NIR spectrometer based on PID control

Zhihong Wang; Liwei Qiao; Xufei Ji

doi:10.1117/12.2251849

7 November 2016 Thermostatic system of sensor in NIR spectrometer based on PID control

Zhihong Wang, Liwei Qiao, Xufei Ji

Proceedings Volume 10141, Selected Papers of the Chinese Society for Optical Engineering Conferences held July 2016; 1014114 (2016) https://doi.org/10.1117/12.2251849
Event: Selected Proceedings of the Chinese Society for Optical Engineering Conferences held July 2016, 2016, Changchun, China

Abstract

Aiming at the shortcomings of the primary sensor thermostatic control system in the near infrared (NIR) spectrometer, a novel thermostatic control system based on proportional-integral-derivative (PID) control technology was developed to improve the detection precision of the NIR spectrometer. There were five parts including bridge amplifier circuit, analog-digital conversion (ADC) circuit, microcontroller, digital-analog conversion (DAC) circuit and drive circuit in the system. The five parts formed a closed-loop control system based on PID algorithm that was used to control the error between the temperature calculated by the sampling data of ADC and the designed temperature to ensure the stability of the spectrometer’s sensor. The experimental results show that, when the operating temperature of sensor is -11℃, compared with the original system, the temperature control precision of the new control system is improved from ±0.64℃ to ±0.04℃ and the spectrum signal to noise ratio (SNR) is improved from 4891 to 5967.

Citation Download Citation

Zhihong Wang, Liwei Qiao, and Xufei Ji "Thermostatic system of sensor in NIR spectrometer based on PID control", Proc. SPIE 10141, Selected Papers of the Chinese Society for Optical Engineering Conferences held July 2016, 1014114 (7 November 2016); https://doi.org/10.1117/12.2251849

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