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Gas concentration monitoring device by combining integrating sphere and diode laser absorption spectroscopy and monitoring method based on monitoring device

A diode laser and diode laser technology, applied in the direction of color/spectral characteristic measurement, can solve the problems of poor miniaturization and low sensitivity, and achieve the effect of low cost, high sensitivity and high reliability

Inactive Publication Date: 2012-12-19
昆山昱翌辉华电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problems of low sensitivity and poor miniaturization of existing gas concentration monitoring devices, thereby providing a gas concentration monitoring device using an integrating sphere combined with diode laser absorption spectroscopy technology and a monitoring method based on the monitoring device

Method used

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  • Gas concentration monitoring device by combining integrating sphere and diode laser absorption spectroscopy and monitoring method based on monitoring device

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specific Embodiment approach 1

[0019] Specific implementation mode 1. Combination figure 1 Describe this specific embodiment, the gas concentration monitoring device that utilizes integrating sphere combined with diode laser absorption spectroscopy technology, it includes modulating sine wave signal generator 1, scanning sawtooth wave signal generator 2, coupler 3, current controller 4, adjustable Diode laser 5, collimating lens 6, integrating sphere 7, focusing lens 8, light detector 9, acquisition card 10 and computer 11;

[0020] The modulated sine wave signal output end of the modulated sine wave signal generator 1 is connected to the modulated sine wave signal input end of the coupler 3; The input end is connected; the coupled signal output end of the coupler 3 is connected to the coupled signal input end of the current controller 4; the control signal output end of the current controller 4 is connected to the control signal input end of the tunable diode laser 5;

[0021] The tunable diode laser 5 em...

specific Embodiment approach 2

[0025] Embodiment 2. The difference between this embodiment and the gas concentration monitoring device using the integrating sphere combined with diode laser absorption spectroscopy technology described in Embodiment 1 is that the inner wall of the integrating sphere 7 is coated with light from the visible band to the near-infrared band. High reflective film.

specific Embodiment approach 3

[0026] Specific embodiment three, based on the gas concentration monitoring method utilizing integrating sphere in conjunction with diode laser absorption spectroscopy technology of specific embodiment one, it is realized by the following steps:

[0027] Step 1. Fill the gas to be measured into the integrating sphere; use the modulated sine wave signal generator 1 to generate a modulated sine wave signal; use the scanning sawtooth wave signal generator 2 to generate a scanning sawtooth wave signal;

[0028] Step 2, using a coupler 3 to couple the modulated sine wave signal and the scanning sawtooth wave signal generated in step 1, and input the coupled signal to the current controller 4;

[0029] Step 3, the current controller 4 controls the operating current parameters and operating temperature parameters of the tunable diode laser 5 according to the coupled signal in step 2, and the tunable diode laser 5 generates a laser beam according to the operating current parameters and...

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Abstract

The invention relates to a gas concentration monitoring device by combining integrating sphere and diode laser absorption spectroscopy and a monitoring method based on the monitoring device, and relates to the gas concentration monitoring device and the monitoring method based on the monitoring device, and the invention solves the problem of low sensitivity and poor miniaturization degree of the current gas concentration monitoring devices. According to the invention, a diode laser is employed as light source, the output light is passed through a collimating lens and then enters into an integrating sphere through a light entering hole of the integrating sphere, the integrating sphere is filled with gas to be measured with unknown, the laser is interacted with gas, an uniform light field is obtained by multiple uniform scattering in the integrating sphere, the scattered light enables emergence through a light outputting hole of the integrating sphere, the emergent light signals are focused to a light reception surface of a detector by a focusing lens, and transformed to electric signals and collected by a data collection card, and the data is input to a computer through a PCI interface for processing to obtain the gas concentration to be measured. The invention is suitable for monitoring the gas concentration.

Description

technical field [0001] The invention relates to a gas concentration monitoring device and a monitoring method based on the monitoring device. Background technique [0002] Real-time online monitoring of gas concentration is of great significance in the fields of industrial production, biomedicine and environmental monitoring. Today, when various gas monitoring technologies are becoming more and more mature, people are pursuing the miniaturization and low cost of instruments while pursuing high sensitivity. [0003] Tunable diode laser absorption spectroscopy (TDLAS) has the advantages of high sensitivity, high resolution, high speed, and real-time online monitoring, making it the mainstream method for optical gas monitoring. In order to improve the detection sensitivity, increasing the optical path on the basis of TDLAS is the most direct and effective means to improve the detection sensitivity. The multi-pass cell has a strong ability to extend the optical path, and is cu...

Claims

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Application Information

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IPC IPC(8): G01N21/39
Inventor 高强张治国曹文武
Owner 昆山昱翌辉华电子科技有限公司
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