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Passive wireless multi-parameter sensor system and multi-parameter measurement method thereof

A passive wireless and sensor technology, which is applied in the direction of converting sensor output, measuring devices, and using electric/magnetic devices to transfer sensing components, etc., can solve the problems of synchronous clocks, complex internal circuits, and limited applications, and achieve timing control Simple, strong anti-interference, saving system resources

Inactive Publication Date: 2014-02-12
SOUTHEAST UNIV
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Problems solved by technology

The internal circuit is complicated, relying on single-chip microcomputer, memory, etc. for signal transmission, which requires a synchronous clock, high cost, and limited application

Method used

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  • Passive wireless multi-parameter sensor system and multi-parameter measurement method thereof
  • Passive wireless multi-parameter sensor system and multi-parameter measurement method thereof

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Embodiment Construction

[0015] The present invention will be further explained below in conjunction with the accompanying drawings.

[0016] like figure 1 As shown, a passive wireless multi-parameter sensor system includes a primary system and a secondary system; the primary system and the secondary system are connected by inductive coupling to transfer energy and signals. Wherein, the main system includes a carrier generation circuit 2 and an envelope detection circuit 3 respectively connected to the first coupled inductor, and also includes a signal amplification circuit 4 connected to the envelope detection circuit 3 . The subsystem includes a rectifying and stabilizing circuit 5 connected to the second coupled inductor, and also includes a multi-parameter sensor C-F conversion circuit 6 , a time-division multiplexing circuit 7 and a load modulation circuit 8 connected in sequence. Among them, the carrier generating circuit 2 adopts a high-efficiency class E switching power amplifier, and transmi...

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Abstract

The invention discloses a passive wireless multi-parameter sensor system and a multi-parameter measurement method of the passive wireless multi-parameter sensor system. Multi-parameter measurement and signal transmission are achieved according to the time-division multiplexing technology. The system comprises a primary system and a subsystem. A signal transmitted by the primary system serves as a modulation carrier and also provides energy for the subsystem. The subsystem receives the signal transmitted by the primary system, and the signal is subject to circuit rectification and voltage stabilization and then provides energy for the subsystem. The subsystem comprises a plurality of capacitance-type sensors sensing changes of system-environment physical quantities. Capacitance signals of the sensors are converted into frequency signals through a C-F conversion circuit; then switching-on and switching-off of a load switch are controlled by multi-path frequency signals through one transmission channel according to the time-division multiplexing technology, and load modulation of a circuit is completed by changing the load impedance of the subsystem. Modulated signals are received by the primary system through inductive coupling to carry out demodulation and amplifying processing. Due to the adoption of the system, the number of measured parameters can be conveniently increased, and it is only required that the number of frequency dividers is increased and the state switching ability of a multiple-way switch is improved.

Description

technical field [0001] The invention relates to a passive wireless multi-parameter sensor telemetry technology, in particular to a passive wireless multi-parameter sensor system and a multi-parameter measurement method thereof. Background technique [0002] The passive wireless multi-parameter sensor system does not need a line to transmit signals, nor does it need a power supply. It has a relatively optimistic application prospect in the monitoring of complex industrial environments, and has a great effect on promoting the development of my country's Internet of Things. The previous RFID technology required batteries and had a short lifespan. Generally, only single-parameter measurement can be realized, and it needs to work at a specific frequency. The internal circuit is complex, relying on single-chip microcomputer, memory, etc. for signal transmission, requiring a synchronous clock, high cost, and limited application. Contents of the invention [0003] Purpose of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/24G01D5/243
Inventor 唐丹王立峰董蕾黄庆安
Owner SOUTHEAST UNIV
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