KEYWORDS: Sensors, Near infrared, Spectroscopy, Control systems, Temperature metrology, Microcontrollers, Signal to noise ratio, Bridges, Control systems design, Lead
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.
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