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Gas sensors

A gas sensor, gas technology, used in instruments, scientific instruments, color/spectral property measurement, etc.

Active Publication Date: 2014-08-06
DRAGER SAFETY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some cases, a warm-up time of several minutes was required before the measurement error was low enough

Method used

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Embodiment Construction

[0030] Turning first to Figures 1 and 2, it can be seen that Figure 1a with Figure 1b state-of-the-art doubling compensation sensors and Figure 2a with Figure 2b A comparison between embodiments of the invention in . Figure 1a The doubling compensation system shown in is commonly implemented in commercially available detectors for use in safety applications. In this doubling compensation system, two light sources A1 , A2 and two detectors B1 , B2 ensure that the measurement is minimally influenced eg by dirty optics, light source drift, temperature. Two different filters C1, C2 are used. One filter C1 transmits the band of wavelengths absorbed by the gas being measured. Another filter C2 is a reference filter for the wavelength band near the transmission.

[0031] as in Figure 1bAs can be seen in , light from one infrared source A2 passes through the measuring volume D and then reaches the beam splitter E such that it hits the two filters C1 and C2. If the gas of i...

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Abstract

A gas sensor for measuring concentration of a predetermined gas comprises a light source (2) arranged to emit pulses of light, a measurement volume (10), a detector (4) arranged to receive light that has passed through the measurement volume (10), and an adaptable filter (6) disposed between the light source (2) and the detector(4).The gas sensor has a measurement state in which it passes at least one wavelength band which is absorbed by the gas and a reference state in which said wavelength band is attenuated relative to the measurement state. The adaptable filter (6) is arranged to change between one of said measurement state and said reference state to the other at least once during each pulse.

Description

technical field [0001] The invention relates to a gas sensor, in particular to a sensor for measuring gas concentration by measuring the absorption of infrared light. Background technique [0002] In order to operate a gas sensor that relies on battery power for long periods of time (typically more than a year), the energy consumption must be low. One way to reduce energy consumption is to keep the sensor in sleep or off mode most of the time and turn it on periodically or occasionally. Typical power requirements for continuously powered infrared sensors are around 0.1-1W. If a measurement takes one second to complete for a non-continuously operated sensor, for example, and the required response time is 10s, the duty cycle becomes 10% and the power consumption is correspondingly reduced to 10-100mW. In the lower part of the range, battery operation becomes possible. Response time requirements will vary for different applications. There are two modes of operation which wo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504
CPCG01N2021/317G01N21/314G01N21/3504G01N2021/3513G01N2201/0693G01N21/61G01N21/35G01N2201/12784G01N2201/12761G01N2201/061G01N2201/0696G01N2201/128G01R27/2605
Inventor 哈康·萨格贝格布里塔·格伦贝格菲斯门卡里·安妮·赫斯特内斯巴克约恩·楚迪伊布-鲁内·约翰森克努特·贝罗·桑德文
Owner DRAGER SAFETY