CN109186781B - Non-contact temperature measuring device based on thermistor - Google Patents
Non-contact temperature measuring device based on thermistor Download PDFInfo
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- CN109186781B CN109186781B CN201810827340.XA CN201810827340A CN109186781B CN 109186781 B CN109186781 B CN 109186781B CN 201810827340 A CN201810827340 A CN 201810827340A CN 109186781 B CN109186781 B CN 109186781B
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- metal current
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- 239000002184 metal Substances 0.000 claims abstract description 43
- 239000013078 crystal Substances 0.000 claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 230000008859 change Effects 0.000 claims abstract description 16
- 239000000919 ceramic Substances 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000004861 thermometry Methods 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 3
- 230000018199 S phase Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
- G01J5/20—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors using resistors, thermistors or semiconductors sensitive to radiation, e.g. photoconductive devices
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Radiation Pyrometers (AREA)
Abstract
The invention discloses a thermistor-based non-contact temperature measuring device, which comprises a laser, a half-reflecting and half-transmitting mirror, a magneto-optical crystal, a first metal current conducting plate, a second metal current conducting plate, a reflector, a resistor, a thermistor, a power supply port, a ground port and an optical phase discriminator. When the temperature causes the resistance value of the thermistor to change, the voltage at the two ends of the thermistor changes along with the change of the temperature, so that the voltage between the first metal current-conducting plate and the second metal current-conducting plate changes, the magnetic field intensity generated between the two metal current-conducting plates changes along with the change of the voltage, the refractive index of the magneto-optical crystal changes, and the phase of the reflected laser is changed; and then the temperature value of the position where the thermistor is laid can be obtained through the phase change monitored by the optical phase discriminator in real time. The system of the invention has unique design, can effectively detect the temperature of the position where the thermistor is laid, and has the advantages of high precision, quick response, large dynamic range and the like.
Description
Technical Field
The invention provides a non-contact temperature measuring device, and particularly relates to a non-contact temperature measuring device based on a thermistor.
Background
A non-contact temperature measuring device based on an optical system is the mainstream direction in the technical field of non-contact temperature measurement, such as a non-contact infrared temperature measuring system, but the system has the defects of limited measuring environment and low precision; the system is high in debugging precision requirement and has the defect of high actual operation requirement like a non-contact temperature measuring device based on the optical interference principle.
Thermistors include resistors having a variable resistance based on temperature. Thus, the thermistor may be implemented in a temperature sensor. In particular, thermistor-based temperature sensors may be more accurate than other temperature sensors such as Resistance Temperature Detectors (RTDs). The thermistors further may include Negative Temperature Coefficient (NTC) thermistors and Positive Temperature Coefficient (PTC) thermistors. More specifically, as the temperature increases, the resistance value of the NTC thermistor decreases, and the resistance value of the PTC thermistor increases.
Disclosure of Invention
In order to overcome the defects or shortcomings of the technology, the non-contact temperature measuring device based on the thermistor is provided, the temperature of the position where the thermistor is laid can be effectively detected through a simple optical system, and the device has the advantages of high precision, quick response, large dynamic range and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a non-contact temperature measuring device based on thermistor which characterized in that: the magneto-optical phase discriminator comprises a laser, a half-reflecting and half-transmitting mirror, a magneto-optical crystal, a first metal current conducting plate, a second metal current conducting plate, a reflector, a first connecting wire, a second connecting wire, a resistor, a thermistor, a power supply port, a grounding port and an optical phase discriminator;
the laser generates a beam of laser, the laser enters a magneto-optical crystal after passing through a semi-reflective and semi-transparent mirror, the laser is reflected back to the semi-reflective and semi-transparent mirror on a reflector, the reflected laser enters an optical phase discriminator after passing through the semi-reflective and semi-transparent mirror, and the optical phase discriminator monitors the phase of the laser in real time;
the refractive index of the magneto-optical crystal is in direct proportion to the intensity of magnetic field borne by the magneto-optical crystal;
the first metal current-conducting plate and the second metal current-conducting plate are parallel to each other, and the magneto-optical crystal is positioned between the first metal current-conducting plate and the second metal current-conducting plate;
one end of each of the first connecting wire and the second connecting wire is connected with two ends of the thermistor respectively, and the other end of each of the first connecting wire and the second connecting wire is connected with the first metal current-conducting plate and the second metal current-conducting plate respectively;
the resistor is a fixed resistance value resistor;
the resistance value of the thermistor changes along with the change of the ambient temperature;
provide invariable supply voltage between power supply port and the ground connection port, when the temperature leads to thermistor resistance to change, the voltage at thermistor both ends changes thereupon, thereby make the voltage between first metal current conducting plate and the second metal current conducting plate change, because the magnetic field intensity that parallel first metal current conducting plate and second metal current conducting plate produced also changes thereupon, the refractive index of magneto-optical crystal can be changed in the change of magnetic field intensity, thereby change the phase place of reflection laser, rethread optical phase discriminator real-time supervision's phase change, can obtain the temperature value of the position that thermistor laid.
Further, the thermistor includes a Negative Temperature Coefficient (NTC) thermistor or a Positive Temperature Coefficient (PTC) thermistor, and wherein the thermistor includes a semiconductor-based thermistor, a ceramic-based thermistor, or a polymer-based thermistor.
Because the invention adopts the technical scheme, the invention has the following beneficial effects:
the temperature of the position where the thermistor is laid can be effectively detected by adopting a simple structure, and the method has the advantages of high precision, quick response, large dynamic range and the like;
secondly, a simple optical system is adopted, and debugging is simple;
thirdly, the direct proportion relation between the refractive index of the magneto-optical crystal and the magnetic field intensity is skillfully applied.
Drawings
Fig. 1 is a schematic diagram of the present invention.
In the figure: the optical phase detector comprises a 1-laser, a 2-half reflection and half transmission mirror, a 3-magneto-optical crystal, a 4-first metal conducting plate, a 5-second metal conducting plate, a 6-reflector, a 7-first connecting wire, a 8-second connecting wire, a 9-resistor, a 10-thermistor, an 11-power supply port, a 12-ground port and a 13-optical phase discriminator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
A non-contact temperature measuring device based on a thermistor is shown in figure 1, and is characterized in that: the magneto-optical phase detector comprises a laser 1, a half-reflecting and half-transmitting mirror 2, a magneto-optical crystal 3, a first metal conducting plate 4, a second metal conducting plate 5, a reflector 6, a first connecting wire 7, a second connecting wire 8, a resistor 9, a thermistor 10, a power supply port 11, a grounding port 12 and an optical phase discriminator 13;
the laser 1 generates a beam of laser, the laser enters the magneto-optical crystal 3 after passing through the transflective mirror 2, the laser is reflected back to the transflective mirror 2 on the reflector 6, the reflected laser enters the optical phase discriminator 13 after passing through the transflective mirror 2, and the optical phase discriminator 13 monitors the phase of the laser in real time;
the refractive index of the magneto-optical crystal 3 is in direct proportion to the intensity of the magnetic field borne by the magneto-optical crystal;
the first metal current-conducting plate 4 and the second metal current-conducting plate 5 are parallel to each other, and the magneto-optical crystal 3 is positioned between the first metal current-conducting plate 4 and the second metal current-conducting plate 5;
one ends of the first connecting wire 7 and the second connecting wire 8 are respectively connected with two ends of the thermistor 10, and the other ends of the first connecting wire and the second connecting wire are respectively connected with the first metal current-conducting plate 4 and the second metal current-conducting plate 5;
the resistor 9 is a resistor with a fixed resistance value, such as 10K omega;
the thermistor 10 resistance varies with ambient temperature, the thermistor 10 may be a Negative Temperature Coefficient (NTC) thermistor or a Positive Temperature Coefficient (PTC) thermistor, and wherein the thermistor 10 may be a semiconductor-based thermistor, a ceramic-based thermistor, or a polymer-based thermistor.
Constant power supply voltage is provided between the power supply port 11 and the ground port 12, for example, 220V, when the resistance value of the thermistor 10 changes due to temperature, the voltage at two ends of the thermistor 10 changes accordingly, so that the voltage between the first metal conducting plate 4 and the second metal conducting plate 5 changes, the magnetic field intensity generated by the parallel first metal conducting plate 4 and the second metal conducting plate 5 also changes accordingly, the change of the magnetic field intensity can change the refractive index of the magneto-optical crystal 3, the phase of reflected laser light is changed, and the phase change monitored in real time by the optical phase discriminator 13 can obtain the temperature value of the position where the thermistor 10 is laid.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (2)
1. The utility model provides a non-contact temperature measuring device based on thermistor which characterized in that: the magneto-optical phase detector comprises a laser (1), a half-reflecting and half-transmitting mirror (2), a magneto-optical crystal (3), a first metal conducting plate (4), a second metal conducting plate (5), a reflector (6), a first connecting wire (7), a second connecting wire (8), a resistor (9), a thermistor (10), a power supply port (11), a grounding port (12) and an optical phase discriminator (13);
the laser (1) generates a beam of laser, the laser enters the magneto-optical crystal (3) after passing through the half-reflecting and half-transmitting mirror (2), the laser is reflected back to the half-reflecting and half-transmitting mirror (2) on the reflector (6), the reflected laser enters the optical phase discriminator (13) after passing through the half-reflecting and half-transmitting mirror (2), and the optical phase discriminator (13) monitors the phase of the laser in real time;
the refractive index of the magneto-optical crystal (3) is in direct proportion to the intensity of the magnetic field borne by the magneto-optical crystal;
the first metal current-conducting plate (4) and the second metal current-conducting plate (5) are parallel to each other, and the magneto-optical crystal (3) is positioned between the first metal current-conducting plate (4) and the second metal current-conducting plate (5);
one ends of the first connecting wire (7) and the second connecting wire (8) are respectively connected with two ends of the thermistor (10), and the other ends of the first connecting wire and the second connecting wire are respectively connected with the first metal current-conducting plate (4) and the second metal current-conducting plate (5);
the resistor (9) is a fixed resistance resistor;
the resistance value of the thermistor (10) changes along with the change of the ambient temperature;
the constant power supply voltage is provided between the power supply port (11) and the grounding port (12), when the resistance value of the thermistor (10) changes due to temperature, the voltage at two ends of the thermistor (10) changes along with the resistance value, so that the voltage between the first metal conducting plate (4) and the second metal conducting plate (5) changes, the magnetic field intensity generated by the parallel first metal conducting plate (4) and the second metal conducting plate (5) also changes along with the resistance value, the refractive index of the magneto-optical crystal (3) can be changed due to the change of the magnetic field intensity, the phase of reflected laser is changed, and the temperature value of the position where the thermistor (10) is laid can be obtained through the phase change monitored by the optical phase discriminator (13) in real time.
2. A thermistor-based non-contact thermometry device according to claim 1, wherein the thermistor (10) comprises a negative temperature coefficient thermistor or a positive temperature coefficient thermistor, and wherein the thermistor (10) comprises a semiconductor-based thermistor, a ceramic-based thermistor or a polymer-based thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810827340.XA CN109186781B (en) | 2018-07-25 | 2018-07-25 | Non-contact temperature measuring device based on thermistor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810827340.XA CN109186781B (en) | 2018-07-25 | 2018-07-25 | Non-contact temperature measuring device based on thermistor |
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| CN109186781A CN109186781A (en) | 2019-01-11 |
| CN109186781B true CN109186781B (en) | 2020-07-24 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4563748A (en) * | 1981-10-20 | 1986-01-07 | Citizen Watch Company Limited | Temperature measuring system |
| JPH08220577A (en) * | 1995-02-09 | 1996-08-30 | Ando Electric Co Ltd | Higher harmonics generator using nonlinear optical crystal |
| US7059769B1 (en) * | 1997-06-27 | 2006-06-13 | Patrick Henry Potega | Apparatus for enabling multiple modes of operation among a plurality of devices |
| CN101825656A (en) * | 2009-12-31 | 2010-09-08 | 上海亨通光电科技有限公司 | Method for rapidly testing half-wave voltage value of lithium niobate optical modulator |
| CN101424708B (en) * | 2008-12-05 | 2011-06-22 | 北京航空航天大学 | Optical voltage transformer |
| KR101768601B1 (en) * | 2016-05-27 | 2017-08-18 | 주식회사 서울스탠다드 | LCD for Military Equipment |
-
2018
- 2018-07-25 CN CN201810827340.XA patent/CN109186781B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4563748A (en) * | 1981-10-20 | 1986-01-07 | Citizen Watch Company Limited | Temperature measuring system |
| JPH08220577A (en) * | 1995-02-09 | 1996-08-30 | Ando Electric Co Ltd | Higher harmonics generator using nonlinear optical crystal |
| US7059769B1 (en) * | 1997-06-27 | 2006-06-13 | Patrick Henry Potega | Apparatus for enabling multiple modes of operation among a plurality of devices |
| CN101424708B (en) * | 2008-12-05 | 2011-06-22 | 北京航空航天大学 | Optical voltage transformer |
| CN101825656A (en) * | 2009-12-31 | 2010-09-08 | 上海亨通光电科技有限公司 | Method for rapidly testing half-wave voltage value of lithium niobate optical modulator |
| KR101768601B1 (en) * | 2016-05-27 | 2017-08-18 | 주식회사 서울스탠다드 | LCD for Military Equipment |
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| CN109186781A (en) | 2019-01-11 |
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Effective date of registration: 20200630 Address after: 518000 Room 201, building F, 472-9 Jinbi Road, biling community, biling street, Pingshan District, Shenzhen City, Guangdong Province Applicant after: SHENZHEN KEYI TECHNOLOGY Co.,Ltd. Address before: 432100 Xiaogan, Hubei province Tung Lung Road, 6 residential units 2 units 1012 rooms. Applicant before: XIAOGAN RUICHUANG MACHINERY TECHNOLOGY Co.,Ltd. |
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