Gas concentration measuring apparatus

A technology of gas concentration measurement and gas chamber, which is applied in the direction of measuring devices, color/spectral characteristic measurement, and material analysis through optical means, and can solve problems that affect the consistency, accuracy and stability of measurement results, low sensor responsivity, Channel mutual interference and other issues, to achieve good consistency, reduce mutual interference, and accurate results

Active Publication Date: 2009-07-01
SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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AI Technical Summary

Problems solved by technology

[0004] 1. Since the multi-channel light shares the same probe design and subsequent signal processing circuit, there is mutual interference between the channels, which affects the consistency, accuracy and stability of the measurement results
[0005] 2. The response of the sensor is low

Method used

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  • Gas concentration measuring apparatus
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Embodiment Construction

[0029] Please refer to figure 1 with figure 2 , The gas concentration measurement system includes a gas probe 1 (ie, a concentration measurement device) and a main control system 8 . The gas concentration measurement uses wide-spectrum infrared light for detection. Probe 1 is an infrared probe, and its structure is as follows figure 2 As shown, a broad-spectrum infrared light source 110 , a chopper wheel 140 , a chopper motor 100 , a measurement gas chamber 160 and a sensor 170 are included. The wide-spectrum infrared light source 110 provides broad-spectrum infrared light containing the absorbable band of the measured gas; at least two filter through-holes are opened on the chopper wheel 140, and the distribution positions of the filter through-holes on the chopper wheel 140 can be designed to be located at On a concentric circle, the filter through holes can pass the infrared light from the light source 110 to the sensor 170 when rotating with the chopper wheel 140, and ...

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Abstract

The invention discloses a gas concentration measurement device, comprising a light source; a sensor for inducing and converting light signals into electric signals to be output; a light source limit hole on the light path between the light source and the sensor for changing the shape of the light beam transmitted from the light source, while the light source limit hole is in the shaped fit with the light sensitive zone of the sensor; a rotary chopper wheel arranged between the light source and the sensor and provided with at least two light filter through holes; at least two filters respectively mounted in the filter through holes for transmitting the belt-pass light of a specific wavelength band; and a measurement gas chamber for containing object gas, while the measurement gas chamber is provided on the light path between the chopper wheel and the sensor, and the light emitted from the light source passes the filters and the measurement gas chamber to radiate the sensor. The gas concentration measurement device has simple design and low cost, has good detection consistence on gas concentration, high accuracy and stability.

Description

【Technical field】 [0001] The invention relates to the field of gas detection, in particular to a measuring device for gas concentration measurement. 【Background technique】 [0002] At present, the measurement principle of gas concentration detectors in the field of medical equipment is generally based on non-dispersive infrared spectroscopy analysis technology, that is, according to the absorption characteristics of a certain band of infrared light by the measured gas, the infrared light of a specific band is selected to pass through the gas sample. The light attenuation and the concentration of the measured gas sample conform to the Beer-Lambert law. Since different detected gases absorb infrared light of a specific wavelength, the content of the component of interest in the measured gas can be calculated by measuring the light intensity after absorption and attenuation. For example, existing measurement equipment and methods for detecting gas concentration in mixed gases ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35G01N21/3504
Inventor 周慧玲武志刚梁恺颜彦石川岑建叶继伦
Owner SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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