Laser radiation source

A technology of coherent radiation and laser diodes, applied in the field of laser radiation sources, can solve the problems of weak absorption, inability to completely eliminate interference sources, low-cost open-circuit gas detectors, etc., and achieve the effect of improving coupling

Inactive Publication Date: 2008-11-05
HONEYWELL ANALYTICS AG
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  • Abstract
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AI Technical Summary

Problems solved by technology

The amount of radiation reflected from the window 16 can be reduced by using an anti-reflection coating applied to the window, but this does not completely eliminate the source of interference
[0008] Therefore, no low-cost, reliable open-path gas detectors have been available so far for a wide variety of toxic gases, those that exhibit weak absorption and target gas concentrations as low as 10 ppm

Method used

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Embodiment Construction

[0029] refer to figure 2 , showing the same figure 1 The package is similar to package 2, but the TEC temperature stabilizer is omitted, and only the front of the housing 34 is shown; the front of the housing has a connector 35 that enables the housing 34 to be connected to the base, sealing the space in housing 34.

[0030] The housing or cover 34 has a window 36 which allows a radiation beam 38 emitted by the laser 30 to be directed along a desired path. The angle α formed by the window with respect to the axis 39 of the beam is approximately 45 degrees. Laser diode 30 is positioned such that it is not in any perpendicular position to window 36 . Reference numeral 40 shows one such vertical position. This means that radiation incident directly on the window 36 from the diode will not be reflected by said window back to the emitter, causing interference. In other words, any images of the emitters reflected in the window are not in the beam 38 transmitted through the win...

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Abstract

A transmitter unit is described for an open path gas detector. The unit comprises: an enclosure (14) having a window (16); and a coherent radiation transmitter (10) , e.g. a tuneable laser diode transmitter, located within the enclosure and configured to direct a beam of radiation through the window. Th window is slanted with respect to the axis of the beam emitted by the transmitter such that no radiation from the transmitter that is directly incident on the window is reflected by the window directly onto the transmitter. Thereby interference fringes within the emitted radiation are reduced. Alternatively, the window may be replaced by a lens followed by an aperture such that the beam emitted by the transmitter is focused onto the aperture, thereby forming a beam of radiation passing out of the enclosure.

Description

technical field [0001] The invention relates to the use of lasers as light sources. As used in this specification, the term "light" is intended to cover electromagnetic radiation, whether visible or not, especially radiation in the infrared range. The invention also relates to the use of such a laser in an open path gas detector for the detection of gases; such a detector comprises an emitter unit and a detection unit, said emitter unit comprising a laser and emitting a beam of radiation through the space to be monitored In the path, the detection unit is used to detect radiation passing through space. The term "open path gas detector" is used to cover gas detectors regardless of the length of the path and whether the path is open or closed to the atmosphere. Background technique [0002] Non-dispersive infrared spectroscopy has been well applied in the detection of hydrocarbon gases. It primarily involves emitting infrared radiation along a path in the monitored area; th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01N21/35G01N21/61H01S5/022
CPCG01N21/3504G01N2021/399G01N21/39H01S5/02296G01N2021/3513G01N2201/0612G01N21/61H01S5/02257
Inventor 斯蒂芬·N·萨顿罗德尼·罗伊斯顿·瓦茨
Owner HONEYWELL ANALYTICS AG
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