Method for detecting methane concentration by ultrasonic waves
A methane concentration and detection method technology, which is applied in the direction of material analysis, measuring devices, and instruments using sound waves/ultrasonic waves/infrasonic waves. It can solve problems such as being easily interfered by water vapor and other impurities, and achieve the elimination of compensation calculations and low power consumption. , the effect of simple structure
Active Publication Date: 2014-09-10
GL TECH CO LTD
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[0003] The object of the present invention is to provide a method for detecting methane concentration using ultrasonic waves, so as to solve the technical problem that the results of measuring methane concentration in the prior art are easily interfered by water vapor and other impurities
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[0018] An embodiment of a detection method for detecting methane concentration using ultrasonic waves, the detection method in this embodiment is: when the gas to be measured flows through the measuring tube, it freely diffuses into two static tubes connected with the measuring tube. Ultrasonic transducers used to measure the propagation velocity of ultrasonic waves in the static tubes are respectively arranged on the static tubes. According to the layout of the ultrasonic transducers on the static tubes, the measurement sound path of the ultrasonic waves propagating in the corresponding static tubes is obtained. The length of the two measurement sound paths on the velocity tube is 1 times different, and the ultrasonic transducer on the corresponding static velocity tube emits and receives the ultrasonic wave to obtain the actual propagation time of the ultrasonic wave in the corresponding measurement sound path, and the corresponding measurement sound path The propagation spee...
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The invention discloses a method for detecting methane concentration by ultrasonic waves. The method includes that gas to be detected is freely dispersed into two static speed pipes communicated with a measuring pipe after flowing through the measuring pipe, ultrasonic transducers used for measuring propagation velocity of ultrasonic waves in the static speed pipes are disposed on the two static speed pipes respectively and transmit and receive the ultrasonic waves so as to acquire practical propagation time of the ultrasonic waves during corresponding sonic path measuring, and the corresponding measured sonic path divides the practical propagation time of the ultrasonic waves in the corresponding static speed pipes to obtain propagation speed Cf1 and Cf2 of the ultrasonic waves in the two static speed pipes; the propagation speeds Cf1 and Cf2 of the ultrasonic waves are introduced into a calculating formula to obtain propagation speed of the ultrasonic waves in the gas to be detected, and then the methane concentration is obtained. The method for detecting the methane concentration by the ultrasonic waves realizes online detection of the methane concentration, and increase of danger coefficient due to delay of measuring results is avoided.
Description
technical field [0001] The invention belongs to the technical field of methane concentration detection, and in particular relates to a detection method and device for detecting methane concentration by ultrasonic waves. Background technique [0002] The measurement of methane concentration in the underground environment of coal mines generally uses catalytic components. In practical applications, due to the interference of water vapor and other gases, it must be calibrated at least once every 7 days. The workload is heavy and the maintenance is cumbersome; The gas content in the pipeline is relatively high, and the thermal conductivity method and infrared measurement method are often used to monitor it, but the measurement results of these two methods are easily affected by water vapor and dust. It is bound to contain dust and water. Therefore, the application of the above two methods in such an environment has great limitations. Contents of the invention [0003] The obj...
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IPC IPC(8): G01N29/024
Inventor 赵彤凯吕照辉李文广李波郭晨伟赵彤亚
Owner GL TECH CO LTD