CN210862727U - Fiber bragg grating temperature and humidity measuring system applied to granary - Google Patents
Fiber bragg grating temperature and humidity measuring system applied to granary Download PDFInfo
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- CN210862727U CN210862727U CN201922129097.7U CN201922129097U CN210862727U CN 210862727 U CN210862727 U CN 210862727U CN 201922129097 U CN201922129097 U CN 201922129097U CN 210862727 U CN210862727 U CN 210862727U
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Abstract
The utility model discloses a be applied to fiber grating temperature measurement humidity system of granary, the system includes light source system, coupler, demodulation appearance, computer and has fiber grating humidity transducer's optic fibre. The utility model discloses a system frame, the space in the granary arrange and fiber grating's fixed mode, can support the inside humiture condition of real-time measurement grain heap, only use single optic fibre can carry out the humiture monitoring of one row (vertical section) measuring point inside the grain heap, along with the increase of between and granary, unit granary temperature measurement humidity cost greatly reduced, this is also this system for traditional cable temperature measurement humidity system's apparent advantage.
Description
Technical Field
The utility model relates to a temperature and humidity measurement system, concretely relates to fiber grating temperature measurement humidity system.
Background
In the grain storage industry, the humidity seriously influences the safe storage of grains. Generally, grain is safe to store at 70% -75% humidity with 13% -13.5% moisture inside. And when the grains are in a safe storage condition, the water content in the grains is generally lower than 12 percent. When the moisture in the grain is increased to more than 20 percent due to the fact that the grain is affected with damp, the metabolism of the grain is accelerated, the respiratory heat is continuously generated, the temperature of local grain is raised, the condition that grain germinates is met, the grain is heated and mildewed inevitably, and the circulation reaction is very easy to generate. To reduce the loss of the grain, it is necessary to maintain a proper humidity and a balanced moisture.
At present, the domestic granary mainly adopts the cable to measure the temperature, the cable has the problems of larger measurement error, low sensitivity, high failure rate and the like, and the precision and the reliability of the granary need to be improved; the humidity sensor is used for measuring the air humidity inside and outside the granary, and the internal condition of the grain pile cannot be directly reflected.
The fiber grating belongs to a fiber passive device, has a plurality of unique advantages, has no electricity, compact structure, small volume, light weight, electromagnetic interference resistance and excellent radiation resistance, has extremely high sensitivity and resolution, and also has the advantage of incomparable ratio in the aspect of transmission distance. Especially, with the rapid development of erbium-doped fiber amplifiers and wavelength division multiplexing technologies, fiber gratings are widely used in the fields of fiber communication, fiber sensing, and the like. Therefore, the fiber bragg grating temperature and humidity measuring system applied to the granary has a very high application value.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a fiber grating temperature measurement humidity system that can be applied to the granary, improve the measurement performance of granary to reduce the laying cost.
In order to solve the technical problem, the utility model discloses a technical scheme be: a fiber grating temperature and humidity measuring system applied to a granary comprises a light source system, an optical coupler, an optical fiber, a fiber grating temperature and humidity sensor, a wavelength demodulator and a signal processing system; the temperature measurement device comprises a light source system, a wavelength demodulator, a signal processing unit and a plurality of fixed boxes, wherein the light source system sends light with a certain bandwidth to enter a fiber bragg grating temperature and humidity sensor through a light optical coupler, the light coupler is connected with the wavelength demodulator to transmit reflected light signals, the wavelength demodulator is connected with the signal processing unit, the signal processing unit deduces a measured temperature value according to wavelength data, and the fixed boxes are arranged on the surface of a grain pile; the number of the optical fibers and the number of the optical couplers are multiple, one end of each optical fiber is inserted into the optical coupler, a plurality of measuring sections are arranged on the optical fibers, a plurality of fiber bragg grating temperature and humidity sensors which are arranged at equal intervals are arranged on each measuring section, the measuring sections are fixed by fixing boxes, and the measuring sections can extend into grain piles.
Further, fixed box includes a bottom plate and two curb plates that are located the bottom plate, and two curb plates parallel arrangement are provided with two via holes on the bottom plate, set up a via hole on every curb plate, and optic fibre passes the via hole of one of them curb plate, two via holes on the bottom plate and the via hole of another curb plate in proper order, carries out axial fixity to optic fibre in via hole department, and optic fibre between two via holes of bottom plate forms the measurement section.
Furthermore, a circular pull ring is arranged in the middle of the optical fiber positioned at the measuring section and used for manually pulling the measuring section to enter the grain pile, and the peripheral surface of the pull ring is attached to the optical fiber to guide the bending of the optical fiber.
Furthermore, a plurality of circular rings are uniformly arranged on the circular pulling peripheral surface, and the optical fibers sequentially penetrate through the circular rings to be bent.
Furthermore, the coating layer of the fiber grating temperature and humidity sensor is a humidity sensitive material-fluorine-containing polyimide film.
According to the above technical scheme, the utility model has the advantages of it is following: the fiber grating type humidity sensor integrates the characteristics of good wet expansion linearity, high temperature resistance, corrosion resistance, high measurement precision, miniaturization, easy multiplexing and the like of the Pt film, and has more advantages compared with the traditional cable measurement technology. In addition, the multi-point whole-row arrangement mode improves the working efficiency, reduces the cost and has good application prospect in the granary.
Drawings
FIG. 1 is a top view of the present invention;
FIG. 2 is a schematic view of the optical fiber laying of the present invention;
fig. 3 is a schematic structural diagram of the middle optical fiber measuring section of the present invention.
Detailed Description
The following description will specifically explain embodiments of the present invention with reference to the accompanying drawings.
Use 2 nest of cars to contain in a granary as the embodiment, as shown in figure 1, the utility model discloses a be applied to fiber grating temperature measurement humidity system of granary includes light source system, optical coupler, optic fibre, fiber grating temperature and humidity sensor, wavelength demodulator and signal processing system. The light source system comprises a light emitting diode, an amplified spontaneous emission light source and the like, light with a certain bandwidth emitted by the light source system enters the fiber bragg grating temperature and humidity sensor through the optical coupler, the optical coupler is responsible for transmission and conversion of the light, and the optical coupler is connected with the wavelength demodulator. The optical fiber grating is used for selecting the central wavelength signal, the light which accords with the wavelength relation is reflected, and then the light is sent into the demodulation device through the optical coupler to demodulate the reflection wavelength change of the optical fiber grating. The optical fiber is erbium-doped fiber. The wavelength demodulator is connected with a signal processing unit, and the signal processing unit can adopt a computer (built-in software). In the embodiment, the humidity-sensitive material, namely the fluorine-containing Polyimide (PI) film, is used as the Fiber Bragg Grating (FBG) coating layer to form the fiber bragg grating type humidity sensor, when the environmental humidity changes, the coating layer expands, so that the fiber bragg grating is elongated and is strained, the Bragg central wavelength is changed, and the computer deduces the measured temperature value by demodulating the drift of the central wavelength, so that the humidity change quantity is indirectly calculated.
As shown in fig. 1 and 2, assume that 5 rows of test points are required for one time. Five rows of fixed boxes 2 (the fixed boxes are not shown in figure 1) are arranged at the top of each grain stack between the cars, and the fixed boxes 2 are arranged on the surfaces of the grain stacks; the quantity of every optical fiber and optical coupler between the car is 5, and every optical fiber 1 corresponds one row of fixed box 2, is provided with 6 measurement sections on every optical fiber 2, is equipped with 3 fiber grating temperature and humidity sensor 3 that equidistant setting is equipped with on every measurement section 6, and the measurement section is fixed by fixed box, and the measurement section can extend to the grain heap.
Fixed box 2 includes a bottom plate and two curb plates that are located the bottom plate, and two curb plate parallel arrangement are provided with two via holes on the bottom plate, set up a via hole on every curb plate, and optic fibre passes the via hole of one of them curb plate, two via holes on the bottom plate and the via hole of another curb plate in proper order, carries out axial fixity to optic fibre in via hole department, can adopt bolt 6 to fix etc. the optic fibre of via hole department. The optical fiber between the two vias of the backplane forms a measurement section. The optical fiber inside the box is arc-shaped, so that the optical fiber is prevented from being excessively bent and damaged.
As shown in figure 3, a circular pull ring 4 is arranged in the middle of the optical fiber of the measuring section and used for manually pulling the measuring section into the grain pile, and the peripheral surface of the pull ring is attached to the optical fiber to guide the bending of the optical fiber. 5 rings are uniformly arranged on the circular pulling peripheral surface, and the optical fiber sequentially penetrates through the rings to be bent. The optical fiber is fixed by the circular ring.
Taking a tall and big horizontal warehouse as an example, when the granary is laid, the whole granary model is divided into 5 rows in the Z-axis direction, optical fibers with fiber bragg grating humidity sensors are inserted downwards from a grain pile at equal intervals in each row, a granary keeper can grab a circular pull ring through a tool and insert downwards until a box for fixing the optical fibers reaches the grain surface, and finally the tool is pulled out. By analogy, each row is inserted with 6 sections of optical fibers, and each section of optical fiber is uniformly distributed with 3 sensors. In the vertical height, the depth of the optical fiber embedded into the grain stack is slightly smaller than the height of the grain stack when the grain stack is full, and the relative positions of the box, the circular pull ring and the sensor on the optical fiber can be adjusted before the distribution according to the requirements of the grain stack. A certain distance needs to be reserved between the wavelength demodulating device and the first section of optical fiber to be inserted, and the distance is used for the waste of on-site implementation of wire dragging; a certain distance needs to be reserved between every two fixed boxes, and the temperature and humidity measuring box can be adjusted according to the requirements of the granary on the space density of temperature and humidity measurement.
The utility model discloses a granary fiber grating temperature measurement humidity system's working process is as follows, light source system sends the light signal, in the fibre of inciding through the coupler, and the incident light meets sensing fiber grating back partly by the reflection, again through the coupler to light signal conversion is the signal of telecommunication, again through the demodulation appearance, demodulates out humiture and corresponding positional information, gathers and shows through the computer at last.
In the implementation process, an optical fiber which meets the measurement precision requirement and is economical needs to be selected, and an optical fiber Bragg grating humidity sensor element is packaged in advance.
Claims (5)
1. A fiber grating temperature and humidity measuring system applied to a granary comprises a light source system, an optical coupler, an optical fiber, a fiber grating temperature and humidity sensor, a wavelength demodulator and a signal processing system; the light source system sends out light of certain bandwidth and gets into in the fiber grating temperature and humidity sensor through the optical coupler, and the optical coupler is connected wavelength demodulator transmission reflected light signal, and wavelength demodulator connects signal processing unit, and signal processing unit deduces the temperature value of measurationing according to wavelength data, its characterized in that: the grain pile comprises a grain pile body and a plurality of fixed boxes, wherein the fixed boxes are arranged on the surface of the grain pile body; the number of the optical fibers and the number of the optical couplers are multiple, one end of each optical fiber is inserted into the optical coupler, a plurality of measuring sections are arranged on the optical fibers, a plurality of fiber bragg grating temperature and humidity sensors which are arranged at equal intervals are arranged on each measuring section, the measuring sections are fixed by fixing boxes, and the measuring sections can extend into grain piles.
2. The fiber bragg grating temperature and humidity measuring system applied to the granary according to claim 1, wherein: the fixed box comprises a bottom plate and two side plates located on the bottom plate, the two side plates are arranged in parallel, two through holes are formed in the bottom plate, a through hole is formed in each side plate, optical fibers sequentially penetrate through the through hole of one side plate, the two through holes in the bottom plate and the through hole of the other side plate, the optical fibers are axially fixed at the through holes, and the optical fibers between the two through holes in the bottom plate form a measuring section.
3. The fiber bragg grating temperature and humidity measuring system applied to the granary according to claim 1 or 2, wherein: a circular pull ring is arranged in the middle of the optical fiber positioned at the measuring section and used for manually pulling the measuring section to enter the grain pile, and the peripheral surface of the pull ring is attached to the optical fiber to guide the optical fiber to bend.
4. The fiber bragg grating temperature and humidity measuring system applied to the granary according to claim 3, wherein: a plurality of circular rings are uniformly arranged on the circular pulling peripheral surface, and the optical fibers sequentially penetrate through the circular rings to be bent.
5. The fiber bragg grating temperature and humidity measuring system applied to the granary according to claim 3, wherein: the coating layer of the fiber grating temperature and humidity sensor is a humidity sensitive material-fluorine-containing polyimide film.
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| CN201922129097.7U CN210862727U (en) | 2019-12-02 | 2019-12-02 | Fiber bragg grating temperature and humidity measuring system applied to granary |
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| CN201922129097.7U CN210862727U (en) | 2019-12-02 | 2019-12-02 | Fiber bragg grating temperature and humidity measuring system applied to granary |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112255200A (en) * | 2020-10-20 | 2021-01-22 | 中国计量科学研究院 | Fiber grating air refractive index measuring device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112255200A (en) * | 2020-10-20 | 2021-01-22 | 中国计量科学研究院 | Fiber grating air refractive index measuring device and method |
| CN112255200B (en) * | 2020-10-20 | 2022-09-27 | 中国计量科学研究院 | Fiber grating air refractive index measuring device and method |
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