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Device and method for improving performance of photoacoustic spectral trace gas sensor

A trace gas, photoacoustic spectroscopy technology, applied in measurement devices, instruments, scientific instruments, etc., can solve the problem of low laser utilization rate, and achieve the effects of high signal amplification, reduced optical path, and improved detection performance

Active Publication Date: 2019-07-12
HARBIN INST OF TECH
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Problems solved by technology

[0005] In order to solve the technical problem of low laser utilization rate in the current photoacoustic spectrum sensing device based on microphone detection, the present invention uses a Pockels cell to change the polarization state of the laser and two right-angle prisms to realize multiple reflections of the beam, and provides a Device and method for improving performance of photoacoustic spectroscopy trace gas sensor

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  • Device and method for improving performance of photoacoustic spectral trace gas sensor
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  • Device and method for improving performance of photoacoustic spectral trace gas sensor

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[0026] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

[0027] The invention provides a device for improving the performance of a photoacoustic spectrum trace gas sensor based on a Pockels cell reflective cavity, such as figure 1 As shown, the device includes a pulsed laser 1, a laser collimation system 2, a film polarizer 3, a first rectangular prism 4, a Pockels cell 5, a photoacoustic cell 6, a second rectangular prism 7, a preamplifier 8, Control and data acquisition system 9 and computer 10, wherein: pulsed laser 1, laser collimation system 2, film polarizer 3, first rectangular prism 4, Pockels cell 5,...

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Abstract

The invention discloses a device and method for improving performance of a photoacoustic spectral trace gas sensor. The device comprises a pulsed laser, a laser collimation system, a thin film polarizer, a first right angle prism, a Pockels cell, a photoacoustic cell, a second right angle prism, a preamplifier, a control and data acquisition system, and a computer, wherein the pulsed laser, the laser collimation system, the thin film polarizer, the first right angle prism, the Pockels cell, the photoacoustic cell and the second right angle prism are sequentially set in the beam propagation direction; a microphone is disposed in the photoacoustic cell and connected to the preamplifier; the preamplifier is connected to the control and data acquisition system; and the control and data acquisition system is connected to the computer. The device and method provided by the invention utilize a Pockels cell to change the polarization state of the laser and two right angle prisms to achieve multiple reflections of the beam.

Description

technical field [0001] The invention relates to a device and a method for improving the performance of a photoacoustic spectrum trace gas sensor, in particular to a device and a method for improving the performance of a photoacoustic spectrum trace gas sensor based on a Pockels cell reflection cavity. Background technique [0002] Photoacoustic spectroscopy is an indirect absorption spectroscopy technique, which is widely used in trace gas detection due to its advantages of high sensitivity, good selectivity, and fast response. The detection performance of the photoacoustic spectroscopy sensor is related to the power of the laser, that is, the signal amplitude detected by the sensor system is proportional to the laser power that excites the gas molecules. Gain benefits in the power approach. [0003] The photoacoustic spectroscopy trace gas detection technology based on microphone detection is a sensitive trace gas detection method. The microphone is placed in the photoacou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01N21/01
CPCG01N21/1702G01N21/01G01N2021/1704
Inventor 马欲飞乔顺达何应彭江波于欣
Owner HARBIN INST OF TECH
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