Permeability-enhanced off-axis integral cavity structure

An off-axis integrating cavity, enhanced technology, applied in the field of spectral detection of the output of the integrating cavity, can solve the problems of low light intensity of the detection light, complex structure, high manufacturing and use costs, and achieve improved signal-to-noise ratio, improved detection sensitivity, and improved The effect of the number of reflections

Active Publication Date: 2017-05-24
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

[0013] The purpose of the present invention is to provide a transmission-enhanced off-axis integrating cavity structure to solve the problems of low light intensity, complex structure and high manufacturing and use costs of the probe light transmitted by the existing integrating cavity

Method used

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  • Permeability-enhanced off-axis integral cavity structure
  • Permeability-enhanced off-axis integral cavity structure
  • Permeability-enhanced off-axis integral cavity structure

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Embodiment 1

[0030] like image 3 and 4As shown, in this embodiment, a transmission-enhanced off-axis integrating cavity structure is shown for the detection of atmospheric formaldehyde (HCHO). The transmission-enhanced off-axis integrating cavity structure includes a laser 1, a first cavity mirror 3 and a second cavity mirror Second cavity mirror 4. The laser 1 is a wavelength tunable laser 1, specifically a 3.5um interband cascade laser (3.5um ICL laser). The front and rear ports of the cavity housing 23 are respectively provided with a front port and a rear port, the first cavity mirror 3 is installed in the front port, the second cavity mirror 4 is installed in the rear port, and the cavity housing 23 is also provided with a A first air inlet nozzle 21 and a first air outlet nozzle 22 communicate with each other inside the cavity housing 23 . The first air inlet nozzle 21 is arranged at the position close to the front end of the cavity housing 23 , the first air outlet nozzle 22 is ...

Embodiment 2

[0032] like Figure 5 As shown, this embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the condenser lens 5 in this embodiment is an off-axis parabolic mirror coated with a 1.653um high-reflection film. Correspondingly, When an off-axis parabolic mirror is used, the laser 1 is a DFB laser, and the concave surfaces of the first cavity mirror 3 and the second cavity mirror 4 are coated with a 1.653um high-reflection film, and the off-axis parabolic mirror will transmit the probe light for 90° reflection Converge and be received by the detector 6, and finally obtain the detection result.

[0033] Image 6 It is an example of the spot pattern generated by the spherical mirror used in the above embodiment, and the example is the spot pattern of different reflection times generated by the dimming process. It can be seen from the figure that compared with the spherical surface used in the traditional off-axis integrating cavity, th...

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Abstract

The invention relates to a permeability-enhanced off-axis integral cavity structure which comprises a laser, a first endoscope and a second endoscope, wherein the first endoscope and the second endoscope are plane-concave lenses; a concave surface of the first endoscope and a concave surface of the second endoscope are oppositely arranged to form an optical cavity; a plane of the first endoscope is a non-polished surface; the concave surface of the first endoscope is a fine polished surface and is plated with a high-reflective film; and after light beams sent by the laser enter to the concave surface of the second endoscope through a taper hole, the light beams are reflected to the concave surface of the first endoscope and then reflected to the concave surface of the second endoscope, reflection back and forth is repeated, light spots are formed on the concave surface of the first endoscope and the concave surface of the second endoscope, and a large amount of weak light beams transmit out through the high-reflective film of the second endoscope to from required probe light. The permeability-enhanced off-axis integral cavity structure has the advantages that the intensity of the transmitted probe light is high, the structure is simple, and the manufacturing cost and the using cost are low.

Description

technical field [0001] The invention relates to the technical field of output spectrum detection of an integrating cavity, in particular to a transmission-enhanced off-axis integrating cavity structure. Background technique [0002] Absorption spectroscopy detection technology is widely used in the detection and research of atmospheric trace gases, isotopes, free radicals and molecular spectra. Increasing the effective absorption path length and increasing the transmitted light intensity are two key factors to improve its detection sensitivity. [0003] In terms of absorption path, optical multipass cell technology and cavity ring-down absorption spectroscopy technology (“Cavity Ring-down Optical Spectrometer for Absorption Measurements Using Pulsed Laser Sources”, Review of Scientific Instruments, 1988, 59(12): 2544~2511) , Integrating Cavity Output Spectrum Cavity or Enhanced Absorption Spectroscopy (“Integrated Cavity Output Analysis of Ultra-Weak Absorption”, Chemical Ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/09G01J3/42
CPCG01J3/42G01J2003/423G01J2003/425G02B27/0977
Inventor 方波赵卫雄张为俊
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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