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Air measuring device with rotation speed automatic control function and air measuring method

A technology of gas measurement and speed, applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problems of affecting the speed of the motor, the speed of the motor is not completely the same, and there is no monitoring and control of the speed of the motor, so as to improve the stability and accuracy, improve accuracy, and ensure stability

Active Publication Date: 2007-12-12
SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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Problems solved by technology

However, in the prior art, the speed of the motor is not monitored and controlled
Due to the influence of factors such as motor performance and the quality of the modulation disc, the speed of different motors is not exactly the same under the same driving voltage, and external interference may also affect the speed of the motor.
The change of the motor speed will cause the frequency of the modulated light to change, which will change the signal strength monitored by the sensor and affect the measurement accuracy of the gas monitoring device

Method used

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  • Air measuring device with rotation speed automatic control function and air measuring method
  • Air measuring device with rotation speed automatic control function and air measuring method
  • Air measuring device with rotation speed automatic control function and air measuring method

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Embodiment Construction

[0032] The principle of the device of the present invention to measure gas concentration is: when infrared light passes through the gas to be measured, infrared light near a certain wavelength is absorbed, and the amount of absorption is related to the concentration of the gas to be measured, that is, the infrared light reaching the detector at this wavelength The energy varies with the concentration of the measured gas. First, the infrared light is modulated into an optical pulse signal by a chopper, and then the optical energy of the infrared light of this wavelength after passing through the gas to be measured is measured by an infrared sensor to calculate the real-time concentration of the gas to be measured. Because the infrared sensor has a certain response bandwidth, and this bandwidth is low. In medical gas monitoring, in order to measure the respiratory waveform at a high respiratory rate and reflect the details of the waveform, the frequency of the modulated optical ...

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Abstract

The revolution automatic control gas measurement device comprises the light, wave plate, measuring gas chamber, filter plate, sensor, drive motor, processing unit, drive signal generation unit, pulse signal generation unit and drive voltage control module, with the pulse signal generation unit generating pulse signal with the frequency in direct proportion with the motor revolution or wave plate revolution, based on the frequency outputting control signal of the frequency to the drive signal generation unit, with the drive signal generating unit modulating PWM wave based on the control signal. Through timely monitor and modulation to the motor or wave plate revolution, it can remove factors due to the motor or wave plate, ensure the wave plate having consistent frequency to modulate the light source. Meanwhile, it can ensure the accuracy of the testing result.

Description

【Technical field】 [0001] The invention relates to a medical gas measuring device, in particular to a gas measuring device and a measuring method for measuring gas concentration in a manner of modulating infrared light by mechanical chopping. 【Background technique】 [0002] In the medical process, gas detection equipment is used to measure the concentration of carbon dioxide exhaled by the patient. In order to eliminate the influence of environmental temperature changes and other factors on the measurement results during direct measurement, current medical gas monitoring equipment generally uses infrared light modulation. Measure in order to improve the anti-interference ability of the equipment. The modulation method of infrared light can be electrical modulation or mechanical modulation. Mechanical modulation is widely used because of its reliable implementation and low requirements on light sources. Mechanical modulation usually adopts the method of mechanical chopping. ...

Claims

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Application Information

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IPC IPC(8): G01N21/17
Inventor 张伟周慧玲武志刚
Owner SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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