CN2173395Y - Ditial double-metal optic fibre temp. sensor - Google Patents
Ditial double-metal optic fibre temp. sensor Download PDFInfo
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- CN2173395Y CN2173395Y CN 93244153 CN93244153U CN2173395Y CN 2173395 Y CN2173395 Y CN 2173395Y CN 93244153 CN93244153 CN 93244153 CN 93244153 U CN93244153 U CN 93244153U CN 2173395 Y CN2173395 Y CN 2173395Y
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- 239000000835 fiber Substances 0.000 title claims description 11
- 239000002184 metal Substances 0.000 title abstract description 7
- 239000013307 optical fiber Substances 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims abstract description 6
- 230000008676 import Effects 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000003208 petroleum Substances 0.000 abstract 1
- 238000009529 body temperature measurement Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of optical fiber sensing. The device is composed of a light source, a light conducting unit, detecting heads, a temperature measuring unit, a detection unit and a display unit. The utility model is characterized in that the detecting heads are double metal sheets; the temperature measuring unit is composed of grid discs connected with the detecting heads, two pieces of input optical fiber, which are respectively arranged above the grid discs and below the grid discs, and two pieces of output optical fiber; the detection unit is composed of two optical detectors and a frequency multiplier circuit for judging phase. The device has the advantages of simple structure, stability and reliability. The measuring accuracy is within 0.2 DEG. The utility model is particularly suitable for temperature detection in flammable and exploded environment, such as petroleum, chemical industry, etc.
Description
The utility model relates to Fibre Optical Sensor and temperature control technology field.
Bimetallic thermograph be widely used at present that oil, chemical industry etc. are inflammable, a kind of temperature measuring device under the explosive environments, this thermometer is to utilize the sheet metal of two kinds of different thermal expansivity to make temperature-sensing element (device), when ambient temperature changes, bimetallic strip generation deformation, produce moment of torsion and drive the pointer rotation that is attached thereto, the angle that pointer rotates is the corresponding temperature variable quantity.That this thermometer has is simple in structure, long-time stability good, and the advantage of good mechanical property, its weak point are that measuring accuracy is low, be generally ± 2 ℃, direct reading measurement data at the scene in addition, can not with computernetworking, realize the temperature of measured object is controlled automatically.
The utility model purpose is to design a kind of novel dual metal sheet temperature sensor, the advantage that had both kept existing bimetallic thermograph, overcome its weak point again, make it to have the precision height, long-time stability are good, be convenient to measurement data and can further realize characteristics to the measured object temperature auto control.
The utility model is designed a kind of digital bimetallic strip fibre optic temperature sensor, formed by light source and light conduction cell, detecting head, temperature measuring unit and detection, display unit, be it is characterized in that said light source and light conduction cell comprise LASER Light Source, light beam that said light source is sent guides into two bundles bifurcation shape fiber coupler and first, second input optical fibres; Said detecting head is a bimetallic strip, its upper end links to each other with the rotating shaft lower end, said temperature measuring unit comprises the grid dish that links to each other with said rotating shaft upper end, will said two import light focuses on first, second concentrating element on the diverse location above the said grid dish respectively, be installed in said grid dish below, receive respectively by two of grid dish and import the 3rd, the 4th concentrating element of light and the 3rd, the 4th output optical fibre that is attached thereto; Said detection, display unit comprise two photo-detectors receiving said the 3rd, the 4th output beam respectively, amplifier, will declare phase, frequency multiplier circuit through what two signals that amplifier amplifies were handled.
The utility model principle of work is as follows: the bimetallic strip that is fixed together is because the thermal expansivity difference, when ambient temperature changes, produce moment of torsion, drive the rotation of grid dish by rotating shaft, two-beam by first, second input optical fibre outgoing focuses on the grid dish, behind the grid dish, two-beam phase phasic difference ± 90 °, when the grid dish rotates, two-beam is modulated, receive by two photelectric receivers by the 3rd, the 4th output optical fibre after the line focus and convert electric signal to, feed signals processing unit processes after amplifying.
The utility model is simple in structure, and is reliable and stable, and the long-time stability of its thermometric are good, and measuring accuracy can reach ± and 0.2 ℃, be applicable to that oil, chemical industry etc. are inflammable, the temperature of explosive environments is surveyed, and the temperature survey of other occasions.
Brief Description Of Drawings:
Fig. 1 is a kind of embodiment general structure of the utility model synoptic diagram;
Fig. 2 is the diagrammatic cross-section of present embodiment temperature measurement fraction;
Fig. 3 is the schematic perspective view of present embodiment temperature measurement fraction;
Fig. 4 is the frequency multiplication direction judgment circuit schematic diagram of present embodiment;
Fig. 5 is the signal waveforms of each node of present embodiment;
The utility model is designed a kind of digital bimetallic strip fibre optic temperature sensor embodiment.Accompanying drawings is as follows.
Fig. 1 is a present embodiment concrete structure synoptic diagram.It comprises light source and light conduction portion, detecting head, temperature measurement fraction and detection display part four parts.Its course of work is: the light that is sent by light source 1, scioptics 2 enter the light conduction portion, the light conduction portion is made up of optical fiber bifurcation type coupling mechanism 3 and the optical fiber 4,5 that is attached thereto, light enters and is divided into two the tunnel by bifurcation type fiber coupler behind the optical fiber and enters temperature measurement fraction 13, light by the temperature measurement fraction outgoing is imported two photo-detectors 10,11 respectively by two optical fiber 6,7 and coupled lens 8,9, detect the display part by photo-detector, amplifier, declare to frequency multiplier circuit unit and display unit 12 and form.After amplifying through amplifier by the electric signal of photo-detector output, again by declare to and frequency multiplier circuit determine the direction (being to heat up or cooling) of temperature variation, and the concrete numerical value of temperature is sent into the numerical value of display unit displays temperature at last.
Fig. 2 is the section of structure of temperature measurement fraction in the present embodiment, be described in detail as follows in conjunction with figure: the garden type holder of forming by upper cross plate 21 lower cross plates 22 that are connected as a single entity and base plate 23 20, wherein, upper cross plate 21 and lower cross plate 22 have two through hole respectively on correspondence position, the two through hole place of upper cross plate is fixed with two outer tubes 24,25, and first, second input optical fibre 4,5 and first, second condenser lens 26,27 are installed in respectively in two outer tubes 24,25.Three, the 4th output optical fibre 6,7 and the three or four condenser lens 28,29 are fixed in the lower cross plate two through hole.Fluted between the last lower cross plate, the part of grid dish is inserted in the groove.
Fig. 3 is present embodiment temperature measurement fraction and measuring probe structure synoptic diagram.Among the figure, bimetallic strip 31 is welded in a steel wire rotating shaft 32 times, and the steel wire rotating shaft other end and grid dish 33 center fixation are together, bimetallic strip and steel wire rotating shaft overcoat one metal tube 34, a metal tube and a cover plate 35 are fixed together, and garden type holder 20 is fixed with cover plate, and the grid dish is inserted in the holder groove.And the light of two input optical fibres transmission is accumulated on the grid dish through two groups of lens, gather into two luminous points respectively.Fixed seating one outer cover 13 is connected as a single entity (as shown in Figure 1) temperature measurement fraction and detecting head.Circuit part of the present utility model carry out frequency multiplication by the input pulse signal that two-way is differed 90 ° and declare to, and up-down counter is provided increase, subtract count signal, thereby play in fibre optic temperature sensor the effect of scale being segmented and heating-cooling being judged.
This circuit theory is made of frequency multiplier circuit and direction judgment circuit as shown in Figure 4, and empty frame inside is divided into frequency multiplier circuit, it is made up of the reverser of RC delay circuit and band application schmitt trigger, the held concurrently effect of shaping of reverser, what of the value decision time-delay of RC, it is neglected the pulsewidth of input signal greatly and decides.The empty frame of Fig. 4 outside is divided into direction judgment circuit, mainly is that signal is handled, make and in temperature-rise period, have only intensification signal UP to work, and in temperature-fall period, have only cooling signal DOWN to work, thereby up-down counter is provided increase, subtract count signal.
Consider the concrete condition of using among the embodiment, two-way input signal SIGNAL1 and SIGNAL2 are respectively the two-way output detection signal of fibre optic temperature sensor optical system, 90 ° of the two phase differential.(1) if signal SIGNAL1 lags behind signal SIGNAL2, shown in Fig. 5 waveform, input signal can obtain the waveform of each node as shown in Figure 5 through a series of reversers and R, C circuit and XOR gate etc.Can be easy to find out that by each waveform among the figure 3 places have obtained frequency-doubled signal at node, node a3,5 signal output waveform with, be always low level, and the signal Up that causes heating up is always low level, inoperative to counting.And cooling signal Down be frequency multiplication pulse signal.(2) as if 90 ° in signal 1 anticipating signal 2 phase places, with similar approach by analysis as can be known, node 6 waveforms are always low level, make cooling signal DOWN also be always low level, and are inoperative to counting.And the pulse signal that intensification signal Up is a frequency multiplication can make counter carry out the subtraction counting, shows it is temperature-rise period at this moment.
With intensification Up signal and the asynchronous up-down counter 74LS192 of the cooling Down signal input decimal system, can carry out the heating-cooling counting, and demonstrate count value by 74LS48 driving charactron LC-5011.
This device can be easily and computernetworking, realizes the monitoring temperature to measured object.
Claims (1)
- A kind of digital bimetallic strip fibre optic temperature sensor, formed by light source and light conduction cell, detecting head, temperature measuring unit and detection, display unit, be it is characterized in that said light source and light conduction cell comprise LASER Light Source, light beam that said light source is sent guides into two bundles bifurcation shape fiber coupler and first, second input optical fibres; Said detecting head is a bimetallic strip, its upper end links to each other with the rotating shaft lower end, said temperature measuring unit comprises the grid dish that links to each other with said rotating shaft upper end, will said two import light focuses on first, second concentrating element on the diverse location above the said grid dish respectively, be installed in said grid dish below, receive respectively by two of grid dish and import the 3rd, the 4th concentrating element of light and the 3rd, the 4th output optical fibre that is attached thereto; Said detection, display unit comprise two photo-detectors receiving said the 3rd, the 4th output beam respectively, amplifier, will declare phase, frequency multiplier circuit through what two signals that amplifier amplifies were handled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93244153 CN2173395Y (en) | 1993-11-12 | 1993-11-12 | Ditial double-metal optic fibre temp. sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93244153 CN2173395Y (en) | 1993-11-12 | 1993-11-12 | Ditial double-metal optic fibre temp. sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2173395Y true CN2173395Y (en) | 1994-08-03 |
Family
ID=33817422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93244153 Expired - Fee Related CN2173395Y (en) | 1993-11-12 | 1993-11-12 | Ditial double-metal optic fibre temp. sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2173395Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101216351B (en) * | 2008-01-11 | 2012-09-05 | 深圳大学 | Bimetal sheet type optical fiber microbending temperature sensor |
| CN107219006A (en) * | 2017-05-22 | 2017-09-29 | 安徽埃克森科技集团有限公司 | A kind of bimetallic thermometer structure |
| CN109974888A (en) * | 2019-03-15 | 2019-07-05 | 上海电仪仪器仪表有限公司 | A kind of temperature transmitter structure |
-
1993
- 1993-11-12 CN CN 93244153 patent/CN2173395Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101216351B (en) * | 2008-01-11 | 2012-09-05 | 深圳大学 | Bimetal sheet type optical fiber microbending temperature sensor |
| CN107219006A (en) * | 2017-05-22 | 2017-09-29 | 安徽埃克森科技集团有限公司 | A kind of bimetallic thermometer structure |
| CN109974888A (en) * | 2019-03-15 | 2019-07-05 | 上海电仪仪器仪表有限公司 | A kind of temperature transmitter structure |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |