Non-chromatic-dispersion infrared gas sensor capable of lowering detection lower limit and detection method thereof

A non-dispersive infrared and gas sensor technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems that the length of the optical path cannot be increased infinitely, the detection accuracy is not high, and the cost of the optical path is increased, so as to reduce the standard deviation stdev, The effect of increasing the number of collections and reducing the lower limit of detection

Pending Publication Date: 2017-11-24
PROMISENSE ELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In order to obtain a better detection resolution, it is generally possible to increase the length L of the optical path, but increasing the length of the optical path will not only increase the cost but also limit the application of the product, and the length of the optical path cannot be in

Method used

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  • Non-chromatic-dispersion infrared gas sensor capable of lowering detection lower limit and detection method thereof
  • Non-chromatic-dispersion infrared gas sensor capable of lowering detection lower limit and detection method thereof
  • Non-chromatic-dispersion infrared gas sensor capable of lowering detection lower limit and detection method thereof

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Embodiment 1

[0044] The number of channels 31 of the infrared detector 3 is set to four: one reference channel, configured with a 3.9 μm filter; three for detecting CO 2 The gas measurement channel is equipped with a 4.26μm filter. The sampling period (scanning rate) of each channel 31 is consistent, which can reduce the CO in the gas to be measured 2 lower limit of detection.

Embodiment 2

[0046] The number of channels 31 of the infrared detector 3 is set to six: one reference channel, configured with a 3.9 μm filter; five for detecting CO 2 The gas measurement channel is equipped with a 4.26μm filter. The sampling period (scanning rate) of each channel 31 is consistent, which can further effectively reduce the CO in the gas to be measured 2 lower limit of detection.

Embodiment 3

[0048] The number of channels 31 of the infrared detector 3 is set to six: one reference channel, configured with a 3.9 μm filter; three for detecting CO 2 The gas measurement channel is configured with a 4.26μm filter; two are used to detect CH 4 The gas measurement channel is equipped with a 3.3μm filter. The sampling period (scanning rate) of each channel 31 is consistent, which can reduce the CO in the gas to be measured 2 、CH 4 lower limit of detection.

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Abstract

The invention provides a non-chromatic-dispersion infrared gas sensor capable of lowering detection lower limit. The sensor comprises an infrared transmitter, a first transmission window, an air chamber, a second transmission window, an infrared sensor and a control module, and the first transmission window and the second transmission window are arranged to be identical or different planar lenses, convex lenses, concave lenses or Fresnel lenses; the infrared detector comprises at least one reference channel and at least one measurement channel group, each measurement channel group comprises at least two measurement channels for detecting same predetermined gas, a plurality of light filters are arranged between the reference channels as well as the measurement channels and the second transmission window, and the light filters adopted by each measurement channel in a same measurement channel group are uniform in specification. By adopting the non-chromatic-dispersion infrared gas sensor and a detection method, collection amount of current signals or voltage signals within unit time is increased effectively, gas concentration detection lower limit is lowered, and resolution is improved.

Description

technical field [0001] The invention relates to the technical field of infrared gas sensors, in particular to a non-dispersive infrared gas sensor capable of reducing the detection lower limit and a detection method thereof. Background technique [0002] Non-dispersive infrared gas sensing (NDIR, Non-Dispersive Infrared) technology is a gas sensing technology with high precision, good stability and long life. Generally, the above-mentioned non-dispersive infrared gas sensor includes an infrared emitter, a gas chamber, Optical filter, infrared detector and control module. In the actual detection process, using the absorption characteristics of the gas to be tested for a certain band of infrared light, select a specific band of infrared light to pass through the gas to be tested, the attenuation of different bands of infrared light and the concentration of the corresponding components in the gas to be tested have an approximate relationship Comply with Beer-Lambert's law: I=I...

Claims

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Application Information

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IPC IPC(8): G01N21/3504G01N21/01
CPCG01N21/01G01N21/3504G01N2201/0662
Inventor 郭安波俞骁王子武刘玮
Owner PROMISENSE ELECTRONICS TECH CO LTD
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