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Intermediate infrared laser gas sensing detecting device and intermediate infrared laser gas sensing detecting method

An infrared laser and gas sensing technology, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., to achieve the effects of low cost, noise reduction, and dark current drift elimination

Active Publication Date: 2015-05-06
NANJING UNIV +1
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Problems solved by technology

[0004] Purpose of the invention: The present invention provides a driving and switching unit for a mid-infrared laser tube in view of the problems existing in the mid-infrared laser gas sensing detection in the prior art

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  • Intermediate infrared laser gas sensing detecting device and intermediate infrared laser gas sensing detecting method
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  • Intermediate infrared laser gas sensing detecting device and intermediate infrared laser gas sensing detecting method

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Embodiment Construction

[0037] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0038] see figure 1 , figure 2 , image 3 with Figure 4As shown, the mid-infrared laser gas sensing and detection device of the present invention includes a driving and switching unit for a mid-infrared laser tube. Among them, the driving and switching unit of the mid-infrared laser tube includes a triode Q1, a triode Q2, a dual-control switch S1, a dual-control switch S2, a triode Q3, and a triode Q4. The collector of the triode Q1 is connected to the VCC voltage t...

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Abstract

The invention discloses an intermediate infrared laser gas sensing detecting device. An intermediate infrared laser LED and an orthogonal phase-locking detection technique are adopted for effectively detecting the trace gas. The light source of the device is composed of two pieces of far infrared laser LEDs and respectively covers a gas absorption spectrum of the gas and a non-gas absorption spectrum. The detecting signal is amplified by a driving and switching unit and two laser tubes can be controlled by the driving and switching unit so as to emit the light according to the time sequence, meanwhile, the gas is detected, the impact caused by the environment and the circuit drift is effectively eliminated, the precision is high, the cost is low and the noise is low.

Description

technical field [0001] The invention relates to a mid-infrared laser gas sensing and detection device and method. Background technique [0002] Among the light sources used by infrared absorption technology at present, the broadband light sources mainly use pyroelectric devices or infrared lamps as detection light sources, and the narrow-band sources mainly include grating cascade lasers with Bragg feedback. However, the former has a large thermal inertia and cannot be modulated, resulting in excessive noise floor and low resolution of the detection system. The latter has a high resolution and can distinguish different absorption lines, but requires accurate and stable laser wavelength and amplitude, high cost, and frequent adjustment of the wavelength and temperature of the laser. [0003] Therefore, a new mid-infrared laser gas sensing and detection device is needed to solve the above problems. Contents of the invention [0004] Purpose of the invention: The present in...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504
Inventor 司峻峰金勇
Owner NANJING UNIV
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