A three-dimensional direction detection method of odor source

Abstract

The invention relates to an odor source three-dimensional direction detection method. Four odor sensors are arranged at four vertexes of a tetrahedron. The method includes: the four sensors acquire odor for a period and output a voltage time sequence; continuous wavelet transform of the output voltage time sequence is performed to obtain fluctuation signals in multiple scales; the modulus maximum value of the fluctuation signal in each scale is extracted, and modulus maximum lines are established; the similarities of the modulus maximum lines are defined, the final global similarity is obtained with the combination of three similarities and corresponding weights, the weights are set according to the significance degrees of various differences, and arrival or departure events of the same odor can be recognized; and according to the similarities of the modulus maximum lines, the modulus maximum lines of the four sensors are matched, and the modulus maximum lines with the highest global similarity are matched as a group so that the responses thereof to the arrival or departure events of the same odor can be found out.

Description

technical field [0001] The invention relates to a device and method for detecting the direction of an odor source, in particular capable of detecting the three-dimensional direction of an odor source. Background technique [0002] With the development of industrialization, more and more hazardous chemicals are directly or indirectly used in production and life. occur. The leakage of poisonous gas seriously threatens the safety of people's lives, the safety of social property and economic development. Therefore, it is very important to find out the location of the unknown leakage source quickly, accurately and reliably for the reasonable disposal and rescue in the later stage. [0003] At present, the odor source detection methods mainly include two paradigms. The more widely used method is to mine the orientation information of the odor source from the time series of odor sensors and wind measurement equipment, that is, to inversely deduce the orientation of the odor sourc...

AI Technical Summary

Problems solved by technology

However, this method has the following two disadvantages: 1) The concentration value of the sensor is directly used to judge the condition of the same package, and the baseline difference of different sensors is relatively large, and it is constantly changing with the use time, sensor life, environment and other factors. The sensor baseline needs to be calibrated; 2) When the sensor distance is relatively close, the commonly used metal oxide sensor is not easy to distinguish the concentration difference between the front and rear sensors, and increasing the sensor distance will increase the size of the detection device and affect portability

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