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Enhanced cavity for a photoacoustic gas sensor

A photoacoustic gas and sensor technology, applied in instruments, material analysis using sound waves/ultrasonic waves/infrasonic waves, scientific instruments, etc., can solve problems affecting sensor sensitivity and operation, increasing optical path length, etc.

Inactive Publication Date: 2012-01-25
HONEYWELL INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increasing the optical path length may affect the sensitivity and operation of such sensors

Method used

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  • Enhanced cavity for a photoacoustic gas sensor
  • Enhanced cavity for a photoacoustic gas sensor
  • Enhanced cavity for a photoacoustic gas sensor

Examples

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Embodiment Construction

[0010] The following description should be read with reference to the drawings, wherein like reference numerals indicate like elements throughout the several views. The detailed description and drawings illustrate various embodiments of the claimed invention.

[0011] figure 1 is a schematic diagram of an illustrative photoacoustic gas detection system 10 that can be used to detect the concentration of a gas sample in an environment. In an illustrative embodiment, the photoacoustic gas detection system 10 may include an electromagnetic radiation source 12 configured to emit electromagnetic radiation, such as a light beam 26, a photoacoustic cell 18 configured to receive a gas sample to be detected, and a photoacoustic cell configured to A detector 22 detects the interaction (eg absorption) between electromagnetic radiation and said gas sample.

[0012] In this illustrative example, the electromagnetic radiation source 12 , which may be a laser, light emitting diode (LED), la...

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Abstract

Photoacoustic cells for gas sensors are described. In some instances, the photoacoustic cell may be configured to provide an increased internal path length of the light beam in the photoacoustic cell relative to, for example, a conventional cylindrical photoacoustic cell (18). The photoacoustic cell (18)may be shaped to provide increased internal reflection of the light (26)within the photoacoustic cell(18), thereby increasing the absorption of the light by a gas to be detected in the photoacoustic cell(18). One example photoacoustic cell (18)that can provide such increased internal reflection may be a generally conical-shaped.

Description

technical field [0001] The present invention relates generally to gas sensors, and more particularly to photoacoustic gas sensors. Background technique [0002] Gas sensors are widely used in many different applications, including commercial, military, and personal applications. The sensitivity of these gas sensors can vary, and the type of gas sensor used for a particular application is often selected based on the desired sensitivity and cost. For many commercially available photoacoustic gas sensors, the sensitivity can be based in part on the length of the internal optical path of the photoacoustic sensor. Increasing the optical path length may affect the sensitivity and operation of such sensors. Contents of the invention [0003] The present disclosure relates generally to gas sensors, and more particularly to photoacoustic gas sensors. In one illustrative embodiment, a photoacoustic gas sensor is disclosed that increases the internal path length of a light beam in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17
CPCG01N21/0303G01N21/031G01N2021/1704G01N29/2425G01N2291/0215G01N21/1702G01N2021/0382
Inventor B·弗里茨
Owner HONEYWELL INT INC