The present invention provides a multi-sensor recognition-based temperature detection system, which comprises a reader, a broadband antenna and N surface acoustic wave sensors, wherein each surface acoustic wave sensor comprises a one-way interdigital transducer and a frequency orthogonal reflection grating code group; the reader sends a query signal to the surface acoustic wave sensors via the broadband antenna; the surface acoustic wave sensors receive an orthogonal frequency coded signal and transforms the orthogonal frequency coded signal into a surface acoustic wave signal according to the trigger of the query signal; the reader receives an echo signal via the broadband antenna. The remote multipoint-connection anti-interference surface acoustic wave wireless sensors based on the combination of orthogonal frequency and code division multiplexing code is adopted, the near-far effect of a passive sensor system for code division multiplexing coding is solved, and demands of an intelligent power grid on the wireless monitoring on the temperature of power equipment are met.

Multi-sensor recognition-based temperature detection system

The invention relates to an on-line temperature monitoring system and method for power cables, in particular to an on-line temperature monitoring system and method for intermediate joints of a buried cable The monitoring system is composed of wireless sensor nodes, TEGs, a wireless temperature measurement concentrator and a monitor center, wherein the intermediate joints of the buried cable are located below cable work wells; the wireless sensor nodes and the TEGs are installed on the outer surfaces of the intermediate joints of the buried cable; the wireless temperature measurement concentrator is installed in a switching station or a ring main unit or a cable branch box at a cable terminal or a branch joint; an antenna of the wireless temperature measurement concentrator extends into a cable channel to collect monitor data of the wireless sensor nodes and send the monitor data to the monitor center through a GPRS or an optical fiber According to the on-line temperature monitoring system and method for the intermediate joints of the buried cable, the TEGs and an energy collector are adopted to convert temperature difference into electric energy to be supplied for a wireless sensor, and at the same time, the monitor data are collected in a wireless mode; the wireless sensor nodes work in a low-power dissipation mode, and therefore the power dissipation of the whole monitoring system is reduced

On-line temperature monitoring system and method for intermediate joints of buried cable

The invention provides a sensor for use in long-distance passive wireless temperature monitoring of power equipment. The sensor comprises a one-way interdigital transducer and a frequency orthogonal reflecting grating chip group, wherein the frequency orthogonal reflecting grating chip group comprises n chips which are arranged in sequence and construct a sensor code; each chip consists of a periodic electrode, thereby forming reflection of one orthogonal sub-frequency; sub-frequencies formed among the chips are orthogonal; the time domain length of each chip reflected signal keeps consistent, and the orthogonality condition is satisfied. The invention further provides a corresponding system. By adopting a long-distance multi-point-connection and anti-interference sound surface wave wireless sensor method, the 'near-far effect' of a code division multiplexing coding passive sensor system is eliminated, and requirement of a smart power grid on wireless monitoring of the temperature of power equipment can be met.

Sensor for use in long-distance passive wireless temperature monitoring of power equipment and system thereof

Systems and methods for directly sensing, measuring, or monitoring the temperature of an electrical conductor (31) of a power cable (10), are provided. A surface acoustic wave (SAW) temperature sensor (20) is used that includes a substrate (20S) with a transducer (20T) disposed thereon. The transducer (20T) conducts conversion between an electromagnetic signal and a SAW signal that propagates on the substrate (20S). At least a portion of the substrate (20S) is disposed in thermal contact with the electrical conductor (31) such that the SAW signal varies with the temperature of the electrical conductor (31).

Surface acoustic wave (saw) based temperature sensing for electrical conductor

The invention belongs to an insulating plug and especially relates to a temperature-measuring insulating plug. The temperature-measuring insulating plug comprises an insulator covered with a heat-conducting connector, wherein a wireless temperature measuring device arranged in the insulator is in contact with the heat-conducting connector. The temperature-measuring insulating plug can be used for directly measuring the temperature at a joint of an electric cabinet set and wirelessly transmitting the measured temperature information; the temperature-measuring insulating plug is high-pressure isolating, safe and reliable; and the mounting is simple and the maintenance is convenient.

Temperature-measuring insulating plug

The utility model belongs to the field of temperature measurement technology, and relates to an acoustic surface wave temperature sensing system used for a buried cable, comprising one or more signal reader-writer, a signal reader-writer comprises at least one acoustic surface wave temperature sensor located at the cable node, the acoustic surface wave temperature sensor is a passive type, and is connected with a built-in antenna, the signal reader-writer comprises a microprocessor, a radio-frequency signal emitting module, a radio-frequency receiving module, and a communication module respectively connected with the microprocessor, the microprocessor sends radio-frequency signals to the acoustic surface wave temperature sensor via the radio-frequency signal emitting module, an interdigital transducer of the acoustic surface wave temperature sensor converts the received radio-frequency signals to acoustic surface signals via an inverse piezoelectric effect, the radio-frequency receiving module processes the received radio-frequency signals with temperature information to temperature data signals and sends the temperature data signals to the microprocessor. The acoustic surface wave temperature sensing system in the utility model can perform a real-time monitoring of temperature of a plurality of (inspection tour) underground cable nodes, and is advantaged by convenience, fastness, and low cost.

Lintao Fan

Papers

Acoustic surface wave temperature sensing system used for buried cable