Surface acoustic wave temperature detection system and detection method based on phased array antenna

Abstract

The invention discloses an acoustic surface wave temperature detection system based on a phased-array antenna and a detection method thereof. The system is characterized in that a reader adopts the phased-array antenna and each sensor node adopts acoustic surface wave devices with a same resonant frequency and a same bandwidth. The temperature detection system is formed by an acoustic surface wave temperature sensor node and the reader. The reader comprises a microcontroller module, an emission module, a transmit-receive isolation module, a receiving module, a phase control module and an array antenna module. The controls a phase of each antenna unit in the array antenna module so as to realize automatic wave beam scanning, and a space division multiple access mode is used to complete temperature detection to different orientations of a space. In the invention, because of a narrow wave beam formed by the phased-array antenna, emission power is concentrated so that a wireless temperature measurement distance and temperature measurement stability can be increased. Compared to a frequency division multiple access mode of an existing detection system, by using the system and the method of the invention, a quantity of sensor nodes can be increased, and simultaneously ISM and national standard frequency band requirements can be satisfied.

Description

Technical field: [0001] The invention relates to a surface acoustic wave temperature detection system and a detection method based on a phased array antenna, belonging to the field of wireless sensing. Background technique: [0002] The surface acoustic wave sensor is a new type of resonant sensor. The surface acoustic wave temperature sensor uses piezoelectric material as the sensitive device, uses the piezoelectric effect, and excites the surface acoustic wave on the piezoelectric substrate through the interdigital transducer, and realizes it according to the change of the resonant frequency of the surface acoustic wave device with the temperature to be measured temperature sensing function. With the cooperation of the reader and the antenna, the surface acoustic wave sensor does not need a power source while performing wireless sensing. The most striking thing about the surface acoustic wave temperature sensor is its wireless function and passive nature, so it has gaine...

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Problems solved by technology

[0004] (1) When measuring outdoors, take the node temperature detection of high-voltage transmission lines as an example. The temperature measurement nodes are located in different directions in space and are far away from each other. It is impossible to measure the temperature through a single reader antenna, and higher requirements are placed on the wireless temperature measurement distance.

[0005] (2) The actual test environment is complex and the interference phenomenon is serious, which affects the wireless temperature measurement distance and temperature measurement stability

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