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

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Problems solved by technology

[0005] However, the gas sensor is restricted by the price of the light source, the cost of single-point me

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

Example Embodiment

[0045] Example one

[0046] figure 1 A structural schematic diagram of the distributed gas sensing system provided in the first embodiment of the present invention is given, such 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 multiple 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 multiplex 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 multiple optical switch. The switch 13, and the laser signal fed back from the multiple optical switch 13 is transmitted to the g...

Example Embodiment

[0054] Example two

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

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

[0057] Among them, the display 20 can be connected to the gas detection main control board 11 through an 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 mirror arranged inside the other end directly opposite to the input / output end. The total mirror can refle...

Example Embodiment

[0070] Example three

[0071] Figure 4 The flow chart of the control method of the distributed gas sensing system provided by the third embodiment of the present invention is given, such as 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 the multiple optical switches to select one laser signal;

[0073] In this step, the controller of the gas detection main control board can send control signal instructions to the multi-path optical switch through the RS232 interface to realize the switching of the multi-path optical switch. The multi-path optical switch can choose 1×8 channels, and you can choose 1 ×16 channels, 1×32 channels can also be selected.

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

[0075] In this step, the gas detection main control board can output a DA control signal to...

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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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