CN101738267A - Cable type switching value temperature sensor with position information and position measurement method of over-temperature point - Google Patents
Cable type switching value temperature sensor with position information and position measurement method of over-temperature point Download PDFInfo
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- CN101738267A CN101738267A CN200910191950A CN200910191950A CN101738267A CN 101738267 A CN101738267 A CN 101738267A CN 200910191950 A CN200910191950 A CN 200910191950A CN 200910191950 A CN200910191950 A CN 200910191950A CN 101738267 A CN101738267 A CN 101738267A
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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
The invention belongs to sensor technical field, be specifically related to a kind of cable type switching value temperature sensor and position measurement method of over-temperature point with positional information.
Background technology
Cable type temperature sensor is compared with point temperature sensor, owing to have and can carry out temperature monitoring to the approximately continuous each point of sensor distributed areas along the line, simple, on-the-spot other wiring of not having are installed, and obtain such as petrochemical industry, electric power, smelting, storage, tunnel, etc. the widespread use in industry or place.Cable type temperature sensor at present commonly used mainly contains two kinds of fiber optic distributed temperature sensor and temperature sensing cables.
Optical fibre distribution type sensor has adopted optical fiber and laser technology, utilizes the Raman scattering temperature effect dorsad of optical fiber and optical time domain reflection (OTDR) technology to carry out temperature detection.Major advantage is to detect approximately continuous thousands of temperature values in the optical fiber whole length range along the line, and because temperature data carries positional information, therefore can provide complete temperature distributing curve diagram.It is comparatively advanced in the world at present a kind of online distributed temperature detection method.The major defect of optical fibre distribution type sensor is length 〉=0.25m of minimum temperature sensitive length, is difficult to use for the less occasion of some heat generating spot, and its higher package price has also restricted it and applies in addition.
Temperature sensing cable is to fill a kind of special negative temperature coefficient material between two plain conductors, makes the resistance between two leads present negative temperature characteristic (NTC).Substantially meet the logarithmic scale relation between its resistance and the temperature.Can obtain temperature sensing cable medial temperature situation of change along the line by the resistance of measuring between two leads.The minimum temperature sensitive length of temperature sensing cable can reach 10mm, and this is that optical fibre distribution type sensor is incomparable, and this also is the great advantage of temperature sensing cable as cable type sensor.Its disadvantage is not for providing the positional information of temperature variation, the occasion that the monitored area is short so be applied in higher to the temperature sensitive length requirement of minimum usually.
In a lot of application scenarios, how many people are to the actual temp value of certain point very is concerned about, what more be concerned about is whether the temperature variation of this point surpasses setting value and the particular location of overtemperature takes place, and requires to have very short responsive length and very long monitored area.
Summary of the invention
At deficiency and the actual demand that above-mentioned two class cable type temperature sensors exist, the invention provides a kind of, renewable type switching value cable type temperature sensor very short, that the monitored area is long and position measurement method of over-temperature point with temperature sensitive length positional information, minimum.
The present invention is realized by following scheme:
A kind of cable type switching value temperature sensor with positional information is characterized in that:
Described cable type switching value temperature sensor comprises temperature-sensitive switch linear array, position signalling line, ground wire, power lead, described temperature-sensitive switch linear array, position signalling line, ground wire, power lead parallel arranged stranding;
Wherein, the temperature-sensitive switch linear array is arranged with the linear array form by some wire temperature-sensitive switches and is formed, and described temperature-sensitive switch is the temperature zone in its whole length range;
Two switch extension lines of described temperature-sensitive switch jump to respectively with this temperature-sensitive switch section position adjacent signal wire and ground wire on, the power outlet of described temperature-sensitive switch is connected on the power lead adjacent with this temperature-sensitive switch section;
Each temperature-sensitive switch all is open-circuit condition, and when cable type sensor point temperature surpassed setting value, the temperature-sensitive switch rapid closing at this place made the position signalling line and the earth short of this section.
Further preferred, described temperature-sensitive switch linear array, position signalling line, ground wire, power lead parallel arranged are by fire resistant PVC sheath parcel stranding.Described position signalling line, ground wire, power lead can be common insulating soft wire.
In described temperature-sensitive switch array, adjacent temperature-sensitive switch spacing distance is preferably less than 1mm; Two switch extension lines of described temperature-sensitive switch and power outlet all with shortest path be connected respectively to this temperature-sensitive switch section position adjacent signal wire, ground wire and power lead on.
The invention also discloses a kind of overtemperature independent positioning method, may further comprise the steps according to the cable type switching value temperature sensor of being with positional information:
Narrow-pulse generator is placed an end of described cable type switching value temperature sensor, and two signal output parts of described narrow-pulse generator link to each other with ground wire with the position signalling line of described sensor respectively;
Inject the low pressure burst pulse by narrow-pulse generator to the position signalling line, this burst pulse is propagated forward with uniform velocity v along the position signalling line;
When propagating into by the position of temperature-sensitive switch short circuit, form reflection owing to impedance mismatching having occurred, burst pulse is reflected back to transmitting terminal;
Measure burst pulse and return used time Δ t from sending to, just can obtain the accurate position of cable type sensor overtemperature point according to l=v Δ t/2, wherein, positional precision and resolution are determined by temperature-sensitive switch length.
Advantage of the present invention is: very weak point, temperature can be recovered after returning automatically, the monitored area is long, can make the sensor of any operating temperature etc. to obtain the accurate location information when some temperature surpass setting value arbitrarily on the whole piece cable type sensor, minimum temperature sensitive length.
The present invention be applicable to whole piece cable type sensor only some the situation that temperature surpasses setting value appears, if more than one some temperature surpasses the situation of setting value, can only obtain positional information apart from the narrow-pulse generator closest approach.
Description of drawings
Fig. 1 is the structural representation of embodiment 1 of the present invention;
Fig. 2 is the sectional view of Fig. 1;
Fig. 3 is the method synoptic diagram that embodiment 4 of the present invention locates.
Embodiment
Below according to Figure of description, and in conjunction with specific embodiments, technical scheme of the present invention is described in further details.
Temperature-sensitive switch linear array, position signalling line, ground wire, power lead parallel arranged stranding are constituted cable type temperature sensor, and sensor has three extension lines, is respectively position signalling line, ground wire and power lead.Wherein the temperature-sensitive switch linear array is arranged with the linear array form by some wire temperature-sensitive switches and is formed, this temperature-sensitive switch is the temperature zone in its whole length range, its temperature zone manufacturing technology adopts the prior art of temperature sensing cable, has the very short advantage of minimum temperature sensitive length; For avoiding temperature sensitive blind area, only separate very little spacing between temperature-sensitive switch and the temperature-sensitive switch; Two switch extension lines of each temperature-sensitive switch are connected across respectively between this temperature-sensitive switch section position adjacent signal wire and the ground wire.Under the normal condition, each temperature-sensitive switch all is open-circuit condition, and when cable type sensor point temperature surpassed setting value, the temperature-sensitive switch rapid closing at this place made the position signalling line and the earth short of this section.
Position measurement method of over-temperature point of the present invention is: according to the echo-bearing principle of electric Time Domain Reflectometry (ETDR), inject the low pressure burst pulse by narrow-pulse generator to the position signalling line, this burst pulse is propagated forward with uniform velocity v along the position signalling line, when propagating into by the position of temperature-sensitive switch short circuit, form reflection owing to impedance mismatching having occurred, burst pulse is reflected back to transmitting terminal; Measure burst pulse and return used time Δ t from sending to, just can obtain the accurate position of cable type sensor overtemperature point according to l=v Δ t/2, positional precision and resolution are mainly determined by temperature-sensitive switch length.
Below by several preferred embodiments technical scheme of the present invention is described in detail.
Embodiment 1: referring to Fig. 1 and Fig. 2, the temperature-sensitive switch 1 of some wire arranged in the linear array mode form the spacing distance≤1mm of adjacent two temperature-sensitive switches 1.Linear array, position signalling line 2, ground wire 3, power lead 4 parallel arranged that temperature-sensitive switch 1 is formed use fire resistant PVC sheath 5 with its parcel stranding then, and wherein position signalling line 2, ground wire 3, power lead 4 are common insulating soft wire.Two switch leads 6 of each temperature-sensitive switch 1 link to each other with ground wire 3 with position signalling line 2 with shortest path respectively, and the power supply lead wire 7 of temperature-sensitive switch 1 links to each other with power lead 4 with shortest path.The present invention only has three extension lines, is respectively position signalling line 2, ground wire 3 and power lead 4.
Embodiment 2: on the basis of embodiment 1, after position signalling line 2 and ground wire 3 are earlier stranded again with temperature-sensitive switch 1 linear array, power lead 4 parallel arranged, can improve antijamming capability.
Embodiment 3: on the basis of embodiment 2, the twisted wire and the power lead 4 usefulness braided metal screens of position signalling line 2 and ground wire 3 are covered, with temperature-sensitive switch 1 linear array parallel arranged, can further improve antijamming capability again.
Embodiment 4: referring to Fig. 3, the method that locates: inject the low pressure narrow pulse signal to position signalling line 2 with narrow-pulse generator 8, this burst pulse is propagated forward with uniform velocity v along position signalling line 2, until propagating into because temperature-sensitive switch 1 closure when making position signalling line 2 form the position 9 of short circuits with ground wire 3, form reflection owing to impedance mismatching occurring, burst pulse is reflected back to transmitting terminal.Measure burst pulse and return used time Δ t from sending to, just obtain the accurate position of cable type sensor overtemperature point according to 1=v Δ t/2, positional precision and resolution are mainly determined by temperature-sensitive switch length.
Claims (7)
1. cable type switching value temperature sensor with positional information is characterized in that:
Described cable type switching value temperature sensor comprises temperature-sensitive switch linear array, position signalling line, ground wire, power lead, described temperature-sensitive switch linear array, position signalling line, ground wire, power lead parallel arranged stranding;
Wherein, the temperature-sensitive switch linear array is arranged with the linear array form by some wire temperature-sensitive switches and is formed, and described temperature-sensitive switch is the temperature zone in its whole length range;
Two switch extension lines of described temperature-sensitive switch jump to respectively with this temperature-sensitive switch section position adjacent signal wire and ground wire on, the power outlet of described temperature-sensitive switch is connected on the power lead adjacent with this temperature-sensitive switch section;
Each temperature-sensitive switch all is open-circuit condition, and when cable type sensor point temperature surpassed setting value, the temperature-sensitive switch rapid closing at this place made the position signalling line and the earth short of this section.
2. the cable type switching value temperature sensor of band positional information according to claim 1, it is characterized in that: described cable type switching value temperature sensor also further comprises fire resistant PVC sheath, and described temperature-sensitive switch linear array, position signalling line, ground wire, power lead parallel arranged are also further wrapped up stranding by described fire resistant PVC sheath.
3. the cable type switching value temperature sensor of band positional information according to claim 1 and 2 is characterized in that: described position signalling line, ground wire, power lead are common insulating soft wire.
4. the cable type switching value temperature sensor of band positional information according to claim 1 and 2 is characterized in that: in described temperature-sensitive switch array, adjacent temperature-sensitive switch spacing distance is less than 1mm; Two switch extension lines of described temperature-sensitive switch and power outlet all with shortest path be connected respectively to this temperature-sensitive switch section position adjacent signal wire, ground wire and power lead on.
5. the cable type switching value temperature sensor of band positional information according to claim 1 and 2 is characterized in that: after position signalling line and ground wire are earlier stranded again with described power lead, temperature-sensitive switch linear array parallel arranged, can improve antijamming capability.
6. the cable type switching value temperature sensor of band positional information according to claim 5, it is characterized in that: after the twisted wire of described position signalling line and ground wire and power lead cover with the braided metal screen, with described temperature-sensitive switch linear array parallel arranged, further improve antijamming capability again.
7. the overtemperature independent positioning method of the cable type switching value temperature sensor of the above described band positional information of arbitrary claim of a basis is characterized in that:
Narrow-pulse generator is placed an end of described cable type switching value temperature sensor, and two signal output parts of described narrow-pulse generator link to each other with ground wire with the position signalling line of described sensor respectively;
Inject the low pressure burst pulse by narrow-pulse generator to the position signalling line, this burst pulse is propagated forward with uniform velocity v along the position signalling line;
When described burst pulse propagates into by the position of temperature-sensitive switch short circuit, form reflection owing to impedance mismatching having occurred, burst pulse is reflected back to transmitting terminal;
Measure described burst pulse and return used time Δ t from sending to, just can obtain the accurate position of cable type sensor overtemperature point according to l=v Δ t/2, wherein, positional precision and resolution are determined by temperature-sensitive switch length.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101919506A CN101738267B (en) | 2009-12-16 | 2009-12-16 | Cable type switching value temperature sensor with position information and position measurement method of over-temperature point |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101919506A CN101738267B (en) | 2009-12-16 | 2009-12-16 | Cable type switching value temperature sensor with position information and position measurement method of over-temperature point |
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| CN101738267A true CN101738267A (en) | 2010-06-16 |
| CN101738267B CN101738267B (en) | 2011-10-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102209110A (en) * | 2011-05-18 | 2011-10-05 | 东南大学 | Online controllable sensing node positioning method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102209110A (en) * | 2011-05-18 | 2011-10-05 | 东南大学 | Online controllable sensing node positioning method |
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