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Distributed gas sensing system and control method thereof

A gas sensing and control method technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of difficult networking, inability to meet regional multi-point measurement, high cost of single-point measurement, and achieve the effect of reducing system cost

Inactive Publication Date: 2015-04-22
BEIJING AEROSPACE YILIAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the gas sensor is restricted by the price of the light source, the cost of single-point measurement is high, and the networking is difficult, which cannot meet the regional multi-point measurement

Method used

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  • Distributed gas sensing system and control method thereof
  • Distributed gas sensing system and control method thereof
  • Distributed gas sensing system and control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] figure 1 A schematic structural diagram of the distributed gas sensing system provided by Embodiment 1 of the present invention is given, as figure 1 As shown, the distributed gas sensing system includes: a laser 10, a gas detection main control board 11, an optical circulator 12, a multi-channel optical switch 13 and at least one gas detection gas chamber 14;

[0047] Among them, the gas detection main control board 11 is used to drive the laser 10 and control the gating of the multi-channel optical switch 13;

[0048] The first port of the optical circulator 12 is connected to the output end of the laser 10, the second port is connected to the multi-channel optical switch 13, and the third port is connected to the gas detection main control board 11, which is used to transmit the laser signal output by the laser 10 to the multi-channel optical switch 13. switch 13, and transmit the laser signal fed back from the multi-channel optical switch 13 to the gas detection ma...

Embodiment 2

[0055] figure 2 A schematic structural diagram of the distributed gas sensing system provided by Embodiment 2 of the present invention is given, as figure 2 As shown, the difference from Embodiment 1 of the present invention is that the system also includes:

[0056] The display 20 is used to display the gas concentration calculation result, and the display 20 is connected with the gas detection main control board 11 through a serial communication interface.

[0057] Wherein, the display 20 can be connected with the gas detection main control board 11 through the RS-232 interface, and the gas detection main control board 11 calculates the gas concentration through a corresponding algorithm, and displays it to the user through the display 20 .

[0058] In this embodiment, the gas detection gas chamber 14 includes an outer tube and a total reflection mirror arranged inside the other end facing the input / output end. The total reflection mirror can reflect back all the laser li...

Embodiment 3

[0071] Figure 4 A flow chart of the control method of the distributed gas sensing system provided by Embodiment 3 of the present invention is given, as shown in Figure 4 As shown, the control method of the distributed gas sensing system includes the following steps:

[0072] S10. The gas detection main control board controls multiple optical switches to select one laser signal;

[0073] In this step, the controller of the gas detection main control board can send a control signal instruction to the multi-channel optical switch through the RS232 interface to realize the switching of the multi-channel optical switch. ×16 channels, 1×32 channels can also be selected.

[0074] S11. The gas detection main control board drives the laser light source to scan the laser modulation wavelength;

[0075] In this step, the gas detection main control board can output a DA control signal to the laser through the RS232 interface to drive the laser to output laser of corresponding wavelen...

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Abstract

The invention provides a distributed gas sensing system and a control method thereof. The system comprises a laser device, a gas detection main control board, an optical circulator, a multi-way optical switch and at least one gas detection gas chamber; the gas detection main control board is used for driving the laser device and controlling gating of the multi-way optical switch; the optical circulator is used for transmitting a laser signal outputted by the laser device to the multi-way optical switch, and transmitting a laser signal fed back from the multi-way optical switch to the gas detection main control board; the multi-way optical switch is used for gating a one-way laser signal; and the at least one gas detection gas chamber is used for absorbing spectra and reflecting the laser signal back to the multi-way optical switch; the gas detection main control board is also used for receiving a laser signal outputted by a third port of the optical circulator, and after photoelectric conversion, the gas concentration is calculated. The main control board controls the multi-way optical switch, one laser device controls multiple ways to perform gas detection, and thus the cost of the system is greatly reduced.

Description

technical field [0001] The invention belongs to the field of gas sensors, and relates to a distributed gas sensing system and a control method thereof. Background technique [0002] A gas sensor is a device that converts information such as gas composition and concentration into information that can be used by personnel, instruments, computers, etc. Among them, the gas sensor based on tunable semiconductor laser absorption spectroscopy technology is an existing device for measuring gas concentration. The gas sensor measures the concentration of the gas by measuring the change of the spectrum after the laser passes through the gas, and has high detection accuracy. , high accuracy, fast response, intrinsically safe, and strong anti-interference characteristics. [0003] Tunable diode laser absorption spectroscopy (TDLAS) technology uses the narrow linewidth and wavelength tunable characteristics of tunable semiconductor lasers to detect single molecular absorption lines of ga...

Claims

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Application Information

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IPC IPC(8): G01N21/39
Inventor 李刚常洋姚晓永宁召科芮雪于东伟
Owner BEIJING AEROSPACE YILIAN TECH DEV
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