CN109060041A - Fiber optic temperature humidity sensor - Google Patents
Fiber optic temperature humidity sensor Download PDFInfo
- Publication number
- CN109060041A CN109060041A CN201811066489.7A CN201811066489A CN109060041A CN 109060041 A CN109060041 A CN 109060041A CN 201811066489 A CN201811066489 A CN 201811066489A CN 109060041 A CN109060041 A CN 109060041A
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- Prior art keywords
- optical fiber
- gas
- tail optical
- fluid column
- pipe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses fiber optic temperature humidity sensors, it include: light source, coupler, pipe, fluid column, optical detector and cloth, the first port of coupler is connected by tail optical fiber one with light source, the second port of coupler is connected by tail optical fiber two with optical detector, the one end and sealing of the third port of coupler by three access tube of tail optical fiber, the other end and sealing of the 4th port of coupler by four access tube of tail optical fiber；In pipe, fluid column is in the middle part of pipe, with the filling of gas one between fluid column and tail optical fiber three, with the filling of gas two between fluid column and tail optical fiber four；Cloth is wrapped in pipe close to one end of gas one；Fluid column is h1 close to the end face of one side of gas and the threshold value of tail optical fiber three, and it is positive number that the fluid column, which is h2, h1 and h2 close to the end face of two side of gas and the threshold value of tail optical fiber four,.Beneficial effects of the present invention: reducing measurement error, improves sensitivity, and output data is easy to quantify, continuously measures and records data for a long time.
Description
Technical field
The present invention relates to machinery industry and instrument manufacturing technology field, in particular to a kind of based on principle of interference
Fiber optic temperature humidity sensor.
Background technique
Thermometer and hygrometer are the sensing utensils for measuring environment temperature and air humidity, are mainly used in indoor and outdoor surroundings
The occasions such as monitoring, weather forecast, common thermometer mainly include quick based on liquid thermal expansion type, solid thermal expansion type, resistance
Sense type etc., hygrometer mainly include relative humidity type and absolute humidity type.
Currently, existing thermometer, hygrometer have been difficult meet the needs of production and development, scale is especially commonly leaned on
The liquid column type of line reading and the electronic temp humidity sensor based on electrically susceptible sense are not able to satisfy required precision, are mainly manifested in tune
Energy saving power is weaker, not high to the process sensitivity of data.So resolution ratio is higher, the better new-type temperature humidity of performance for research
Sensor has important practical significance.With the development of optical field, also there is laser leveler.Laser leveler due to
Have many advantages, such as that measurement is accurate, rapid to be widely applied by heavy construction and fitting-out work, but it requires light source and structural failure
Harshness, and structure is complicated, expensive.
Summary of the invention
To solve the above problems, measuring more accurate, the higher optical fiber of sensitivity the purpose of the present invention is to provide a kind of
Humidity temperature pickup.
The present invention provides fiber optic temperature humidity sensors, comprising: light source, coupler, pipe, fluid column, optical detector and cloth
Material；
The first port of the coupler is connected by tail optical fiber one with the light source, and the second port of the coupler passes through
Tail optical fiber two is connected with the optical detector, the one end and sealing of the third port of the coupler by three access tube of tail optical fiber, institute
State the other end and sealing of the 4th port of coupler by four access tube of tail optical fiber；In pipe, fluid column is in the middle part of pipe, fluid column
With the filling of gas one between tail optical fiber three, with the filling of gas two between fluid column and tail optical fiber four；Cloth is wrapped in pipe close to gas one
One end；
The fluid column is h1 close to the end face of one side of gas and the threshold value of tail optical fiber three, and the fluid column is close to gas two
It is positive number that the end face of side and the threshold value of tail optical fiber four, which are h2, h1 and h2,.
As further improvement of the invention, three end reflections rate of membrane change tail optical fiber, reflection are plated in the end of the tail optical fiber three
Rate value range 1%~60%；Plate four end reflections rate of membrane change tail optical fiber, reflectivity value range in the end of the tail optical fiber four
1%~60%.
Improved as of the invention further, the axis shape of the pipe be respectively linear, U-shaped, V-arrangement, arc one
Kind.
As further improvement of the invention, the sectional dimension inside the pipe is less than 1mm.
As further improvement of the invention, the tail optical fiber three and tail optical fiber four are inserted into respectively at the central axes of the pipe.
As further improvement of the invention, the fluid column is mercury, and the length of the fluid column axial direction is greater than radial diameter.
As further improvement of the invention, the gas one and gas two are the gas insoluble in the fluid column, gas
One with gas two is gas of the same race, or gas not of the same race.
The invention has the benefit that
Response time is short, at low cost, and measurement accuracy is high, and output data is easy to quantify, continuously measures and records number for a long time
According to.
Detailed description of the invention
Fig. 1 is fiber optic temperature humidity sensor described in first embodiment of the invention；
Fig. 2 is fiber optic temperature humidity sensor described in second embodiment of the invention；
Fig. 3 is fiber optic temperature humidity sensor described in third embodiment of the invention；
Fig. 4 is fiber optic temperature humidity sensor described in fourth embodiment of the invention.
In figure,
1, light source；2, coupler；3, it manages；4, fluid column；5, optical detector；6, cloth；71, gas one；72, gas two；21,
Tail optical fiber one；22, tail optical fiber two；23, tail optical fiber three；24, tail optical fiber four.
Specific embodiment
The present invention is described in further detail below by specific embodiment and in conjunction with attached drawing.
Embodiment 1, as shown in Figure 1, the fiber optic temperature humidity sensor of first embodiment of the invention, comprising: light source 1, coupling
Clutch 2, pipe 3, fluid column 4, optical detector 5 and cloth 6.
The first port of coupler 2 is connected by tail optical fiber 1 with light source 1, and the second port of coupler 2 passes through tail optical fiber two
22 are connected with optical detector 5, the one end and sealing of the third port of coupler 2 by 3 23 access tube 3 of tail optical fiber, coupler 2
The other end and sealing of 4th port by 4 24 access tube 3 of tail optical fiber；In pipe 3, fluid column 4 is in the middle part of pipe 3, fluid column 4 with
With the filling of gas 1 between tail optical fiber 3 23, with the filling of gas 2 72 between fluid column 4 and tail optical fiber 4 24；Cloth 6 is wrapped in pipe 3 and leans on
One end of nearly gas 1.
Fluid column 4 is h1 close to the end face of one 71 side of gas and the threshold value of tail optical fiber 3 23, and fluid column 4 is close to gas 2 72
It is positive number that the end face of side and the threshold value of tail optical fiber 4 24, which are h2, h1 and h2,.
Plate 3 23 end reflections rate of membrane change tail optical fiber, reflectivity value range 1%~60% in the end of tail optical fiber 3 23；Tail optical fiber
Plate 4 24 end reflections rate of membrane change tail optical fiber, reflectivity value range 1%~60% in 4 24 end.
The axis shape of pipe 3 is linear, and the sectional dimension inside pipe 3 is less than 1mm, and tail optical fiber 3 23 and tail optical fiber 4 24 are distinguished
At the central axes of insertion tube 3.
Fluid column 4 uses mercury in the present embodiment, it is not limited to this, any energy reflecting part is divided and has heat expansion cold
The liquid of contracting characteristic is ok, and the axial length of fluid column 4 is greater than radial diameter.
Gas 1 and gas 2 72 are the gas insoluble in fluid column 4, and gas 1 and gas 2 72 are gas of the same race.
The optical signal that light source 1 generates is transmitted to coupler 2 by tail optical fiber 1, is divided into two beams, a branch of to pass through tail optical fiber 3 23
Be transmitted in pipe 3, tail optical fiber 3 23 end and fluid column 4 close to cloth 6 end face occur light reflection, reflected light again by
Tail optical fiber 3 23 is back to coupler 2；Another beam is transferred in pipe 3 by tail optical fiber 4 24, remote in the end of tail optical fiber 4 24 and fluid column 4
The reflection of light occurs for the end face from cloth 6, and reflected light is back to coupler 2 again by tail optical fiber 4 24.Optical signal eventually by
Tail optical fiber 2 22 is transmitted to optical detector 5.By the calculating to the optical signal received, the length situation of change of h1 and h2 is obtained,
The axial length for calculating fluid column 4, determines ambient temperature value.
When sensor is in running order, cloth 6 is dipped into a certain amount of water, due to the evaporation of water in moving air
Heat absorption, leads to cloth temperature decline nearby, and the amplitude of temperature decline is related to air humidity；Fluid column 4 is expanded with heat and contract with cold due to liquid
Characteristic, axial flexible, the length reaction environment temperature value of fluid column 4 can be generated.
The temperature value of the thermotonus environment of gas 2 72, the temperature of gas 1 are lower than the temperature of gas 2 72.When pipe 3
When horizontal positioned, gas 1 is identical with the air pressure of gas 2 72, determines gas 1 and gas according to the length of h1 and h2
The humidity value of air is obtained by calculation in 2 72 temperature difference；When 3 non-aqueous placing flat of pipe, gas 1 and gas 2 72
Air pressure is not identical, and air pressure difference is determined by the vertical drop of 4 two liquid levels of fluid column, determines gas in conjunction with the length of h1 and h2
1 and gas 2 72 temperature difference, the humidity value of air is obtained by calculation.
Embodiment 2, as shown in Fig. 2, the fiber optic temperature humidity sensor of second embodiment of the invention, different from embodiment 1
Place is that the axis shape of pipe 3 is U-shaped in the present embodiment.
Gas 1 and gas 2 72 are gas not of the same race, the temperature value of the thermotonus environment of gas 2 72, gas one
71 temperature is lower than the temperature of gas 2 72.The air pressure difference of gas 1 and gas 2 72 is vertical by 4 two liquid levels of fluid column
Difference in height determines, the temperature difference of gas 1 and gas 2 72 is determined in conjunction with the length of h1 and h2, air is obtained by calculation
Humidity value.
Embodiment 3, as shown in figure 3, the fiber optic temperature humidity sensor of third embodiment of the invention, different from embodiment 2
Place is that the axis shape of pipe 3 is V-arrangement in the present embodiment.
Embodiment 4, as shown in figure 4, the fiber optic temperature humidity sensor of fourth embodiment of the invention, different from embodiment 2
Place is that the axis shape of pipe 3 is arc in the present embodiment.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of fiber optic temperature humidity sensor characterized by comprising light source (1), coupler (2), pipe (3), fluid column (4),
Optical detector (5) and cloth (6)；
The first port of the coupler (2) is connected by tail optical fiber one (21) with the light source (1), and the of the coupler (2)
Two-port netwerk is connected by tail optical fiber two (22) with the optical detector (5), and the third port of the coupler (2) passes through tail optical fiber three
(23) the 4th port of one end of access tube (3) and sealing, the coupler (2) passes through the another of tail optical fiber four (24) access tube (3)
One end simultaneously seals；In pipe (3), fluid column (4) is in the middle part of pipe (3), with gas one between fluid column (4) and tail optical fiber three (23)
(71) it fills, with gas two (72) filling between fluid column (4) and tail optical fiber four (24)；Cloth (6) is wrapped in pipe (3) close to gas one
(71) one end；
The fluid column (4) is h1, the fluid column (4) close to the end face of gas one (71) side and the threshold value of tail optical fiber three (23)
It is positive number that the end face of close gas two (72) side and the threshold value of tail optical fiber four (24), which are h2, h1 and h2,.
2. fiber optic temperature humidity sensor according to claim 1, which is characterized in that plate the end of the tail optical fiber three (23)
Membrane change tail optical fiber three (23) end reflections rate, reflectivity value range 1%~60%；The end plated film of the tail optical fiber four (24) changes
Tail optical fiber four (24) the end reflections rate of change, reflectivity value range 1%~60%.
3. fiber optic temperature humidity sensor according to claim 1, which is characterized in that the axis shape of the pipe (3) point
It Wei not one of linear, U-shaped, V-arrangement, arc.
4. fiber optic temperature humidity sensor according to claim 3, which is characterized in that the internal section ruler of the pipe (3)
It is very little to be less than 1mm.
5. fiber optic temperature humidity sensor according to claim 1, which is characterized in that the tail optical fiber three (23) and tail optical fiber four
(24) it is inserted into respectively at the central axes of the pipe (3).
6. fiber optic temperature humidity sensor according to claim 1, which is characterized in that the fluid column (4) is mercury, described
The length of fluid column (4) axial direction is greater than radial diameter.
7. fiber optic temperature humidity sensor according to claim 1, which is characterized in that the gas one (71) and gas two
It (72) is the gas insoluble in the fluid column (4), gas one (71) and gas two (72) are gas of the same race, or gas not of the same race.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811066489.7A CN109060041B (en) | 2018-09-10 | 2018-09-10 | Optical fiber temperature and humidity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811066489.7A CN109060041B (en) | 2018-09-10 | 2018-09-10 | Optical fiber temperature and humidity sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109060041A true CN109060041A (en) | 2018-12-21 |
| CN109060041B CN109060041B (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811066489.7A Active CN109060041B (en) | 2018-09-10 | 2018-09-10 | Optical fiber temperature and humidity sensor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109664A (en) * | 2007-08-21 | 2008-01-23 | 李亚滨 | Optical fiber temp/moisture sensor and manufacturing method and metering installation thereof |
| CN102393359A (en) * | 2011-10-18 | 2012-03-28 | 大连理工大学 | Fiber bragg grating temperature sensor |
| CN204346962U (en) * | 2014-10-15 | 2015-05-20 | 廊坊市大华夏神农信息技术有限公司 | Relative air humidity sensor under a kind of high humidity condensation environment |
| WO2015181155A1 (en) * | 2014-05-26 | 2015-12-03 | Danmarks Tekniske Universitet | Optical sensor for measuring humidity, strain and temperature |
| CN107655514A (en) * | 2016-07-26 | 2018-02-02 | 吴苗成 | Popped one's head in using the wet-dry change temperature and humidity sensing of fiber-optic grating sensor |
-
2018
- 2018-09-10 CN CN201811066489.7A patent/CN109060041B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109664A (en) * | 2007-08-21 | 2008-01-23 | 李亚滨 | Optical fiber temp/moisture sensor and manufacturing method and metering installation thereof |
| CN102393359A (en) * | 2011-10-18 | 2012-03-28 | 大连理工大学 | Fiber bragg grating temperature sensor |
| WO2015181155A1 (en) * | 2014-05-26 | 2015-12-03 | Danmarks Tekniske Universitet | Optical sensor for measuring humidity, strain and temperature |
| CN204346962U (en) * | 2014-10-15 | 2015-05-20 | 廊坊市大华夏神农信息技术有限公司 | Relative air humidity sensor under a kind of high humidity condensation environment |
| CN107655514A (en) * | 2016-07-26 | 2018-02-02 | 吴苗成 | Popped one's head in using the wet-dry change temperature and humidity sensing of fiber-optic grating sensor |
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|---|---|
| CN109060041B (en) | 2020-07-10 |
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