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Cable type switching value temperature sensor with position information and position measurement method of over-temperature point

A technology of temperature sensor and location information, which is applied in the field of sensors, can solve the problem that the location information of temperature changes cannot be provided, and achieve the effect of long monitoring area

Inactive Publication Date: 2010-06-16
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its biggest disadvantage is that it cannot provide position information of temperature changes, so it is usually used in occasions where the minimum temperature-sensitive length is required to be high and the monitoring area is short

Method used

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  • Cable type switching value temperature sensor with position information and position measurement method of over-temperature point
  • Cable type switching value temperature sensor with position information and position measurement method of over-temperature point
  • Cable type switching value temperature sensor with position information and position measurement method of over-temperature point

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: see figure 1 with figure 2 , a number of linear temperature-sensitive switches 1 are arranged in a linear array, and the distance between two adjacent temperature-sensitive switches 1 is ≤1mm. Then arrange the line array composed of the temperature sensitive switch 1, the position signal line 2, the ground line 3, and the power line 4 in parallel, and wrap it into a cable with a high temperature resistant fireproof PVC sheath 5, wherein the position signal line 2, the ground line 3, The power cord 4 is an ordinary insulated flexible wire. The two switch lead wires 6 of each temperature sensitive switch 1 are respectively connected to the position signal line 2 and the ground wire 3 by the shortest path, and the power lead wire 7 of the temperature sensitive switch 1 is connected to the power line 4 by the shortest path. The present invention has only three lead wires, which are the position signal wire 2, the ground wire 3 and the power wire 4 respectively...

Embodiment 2

[0030] Embodiment 2: On the basis of Embodiment 1, the position signal line 2 and the ground wire 3 are first twisted and then arranged in parallel with the temperature-sensitive switch 1 line array and the power line 4, which can improve the anti-interference ability.

Embodiment 3

[0031] Embodiment 3: On the basis of Embodiment 2, the twisted wire of the position signal wire 2 and the ground wire 3 and the power wire 4 are shielded with a braided metal mesh, and then arranged in parallel with the temperature-sensitive switch 1 line array, which can further improve the resistance Interference ability.

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Abstract

The invention relates to a cable type switching value temperature sensor with position information and a position measurement method of over-temperature points. The sensor comprises a temperature sensitive switch linear array, position signal lines, grounding lines and a power line which are arranged side by side into a cable, wherein the temperature sensitive switch linear array is formed by arraying linear temperature sensitive switches with temperature sensing areas within the whole length range in a linear array mode; the temperature sensitive switches are in an open circuit state under a normal condition, and once the temperature exceeds a set value, the temperature sensitive switches are quickly closed; two switch leads of each temperature sensitive switch are respectively spanned to a position signal line and a grounding line adjacent to the temperature sensitive switch; and when the temperature of a point of the sensor is overhigh, a position signal line and a grounding line of the corresponding position of the point are short out. During measurement, low-voltage burst pulses are injected into the position signal lines, and when the pulses are spread to the short out position along the position signal lines, reflection occurs because of impedance mismatching so as to measure the time delta t used from transmitting to returning, and the accurate position of the over-temperature point can be obtained according to a formula l=v delta t / 2. The sensor has the advantages of obtain of specific position information of the over-temperature point, quite short sensitive length, longer monitoring area, and the like.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a cable-type switching value temperature sensor with position information and a method for measuring the position of an overtemperature point. Background technique [0002] Compared with the point-type temperature sensor, the cable-type temperature sensor has the characteristics of monitoring the temperature of approximately continuous points along the distribution area of ​​the sensor, simple installation, and no other wiring on site. , tunnels, and other industries or places are widely used. At present, the commonly used cable-type temperature sensors mainly include optical fiber distributed temperature sensors and temperature-sensing cables. [0003] The optical fiber distributed sensor adopts optical fiber and laser technology, and uses the back Raman scattering temperature effect of optical fiber and optical time domain reflection (OTDR) technology for temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/00G01K3/00
Inventor 扶新高潮贺俊杰段沽坪张超曾
Owner CHONGQING UNIV
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