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Gas multi-pass cell temperature control system and method based on self-adaptive interval PID control

A temperature control system and self-adaptive technology, which are applied to electric controllers, controllers with specific characteristics, and temperature control by electric means, can solve the problems of complex structure of gas multi-pass cells and large thermal response time constant, etc. Achieve no overshoot stabilization time, reduce heat exchange, and control precise effects

Inactive Publication Date: 2018-11-13
JILIN UNIV
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Problems solved by technology

[0006] The object of the present invention is to provide a gas multi-pass cell temperature control system and method based on adaptive interval PID control for the above-mentioned difficulties and the complex structure of the gas multi-pass cell in the prior art and the problem of large thermal response time constant

Method used

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  • Gas multi-pass cell temperature control system and method based on self-adaptive interval PID control
  • Gas multi-pass cell temperature control system and method based on self-adaptive interval PID control
  • Gas multi-pass cell temperature control system and method based on self-adaptive interval PID control

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Embodiment 1

[0050] When the gas to be measured enters the gas multi-pass cell, the temperature of the gas multi-pass cell will change, and the resistance value of the platinum resistance PT1000 on the outer wall of the gas sample cell 2 will change, and the resistance value of the platinum resistance PT1000 will cause the Huygens bridge circuit to The output differential voltage signal changes, and the differential voltage signal is amplified by the instrument amplifier AD620, then sampled by the analog-to-digital converter AD7705, and the analog voltage signal is converted into a digital signal and input to the input terminal of the single-chip microcomputer STM32 for data processing.

[0051] The control part uses an adaptive interval PID controller to collect the kth actual temperature value youk(k), and calculate the kth temperature deviation value e(k)=rin(k)-youk(k), where rin( k) represents the temperature set point. Input the obtained temperature deviation value e(k) as an input p...

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Abstract

The invention relates to a gas multi-pass cell temperature control system and method based on self-adaptive interval PID control, and belongs to the field of gas multi-pass cell temperature control. The outer wall of a gas sample cell is wrapped by a heating film to realize heating of the gas multi-pass cell, a PT1000 resistance temperature sensor is arranged between the outer wall of the gas sample cell and the heating film to detect the working temperature of the gas multi-pass cell in real time, and heat insulation cotton is adopted for the integral gas multi-pass cell to form a heat insulation effect. Improvement is made on the basis of a traditional PID control algorithm for solving the problem of large overshoot caused by the fact that a controlled object has complex structure and responses slowly, the control process is subdivided into a plurality of intervals according to temperature deviation values, a proportional amplification coefficient, an integral coefficient and a differential coefficient are set in each interval according to the interval value and the change rate of the temperature deviation value, the adaptive interval PID control algorithm is achieved, and accordingly, the temperature is controlled quickly without overshoot. Reliable guarantee is provided for improvement of performance of a carbon dioxide isotope detection system.

Description

technical field [0001] The invention belongs to the field of temperature control of a gas multi-pass cell, and in particular relates to a temperature control system and a control method for high-precision control of a gas multi-pass cell for infrared gas isotope detection. Background technique [0002] The precise measurement of gas isotopes has important applications in the fields of biomedicine, hydrology, paleontology, geochemistry, and atmospheric physical chemistry. The use of laser absorption spectroscopy for gas isotope detection is very conducive to the development of a real-time online measurement system. Since the absorption coefficient of the absorption line of the gas to be measured will be affected by the temperature of the gas to be measured, the amplitude of the generated voltage signal will change with the change of the gas temperature, which will directly affect the stability and accuracy of the detection system. Therefore, in practical applications, it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/42G05D23/19G01N21/01
CPCG01N21/01G05B11/42G05D23/19
Inventor 谢洪涛陈晨郑传涛王一丁于伟泳刘志伟任强韩锋博
Owner JILIN UNIV
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