CN211401477U - Distributed optical fiber temperature measurement system applied to granary - Google Patents
Distributed optical fiber temperature measurement system applied to granary Download PDFInfo
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- CN211401477U CN211401477U CN201922152332.2U CN201922152332U CN211401477U CN 211401477 U CN211401477 U CN 211401477U CN 201922152332 U CN201922152332 U CN 201922152332U CN 211401477 U CN211401477 U CN 211401477U
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Abstract
The utility model discloses a be applied to distributed optical fiber temperature measurement system of granary, the system includes pulse laser, spectral module, photomultiplier, sensing optical fiber and signal processing module. The grain pile is characterized by also comprising fixed boxes, wherein the fixed boxes are arranged on the top surface of the grain pile and are arranged in multiple rows and multiple columns; each row of fixed boxes corresponds to one sensing optical fiber, each sensing optical fiber connects the fixed boxes in one row in series, and the fixed boxes can axially fix the sensing optical fibers at connection points; the sensing optical fiber is positioned at the grain pile part and comprises a vertical section and a horizontal section, the horizontal section is arranged along the bottom of the grain pile, and the vertical section is respectively positioned at two ends of the horizontal section. Compared with the traditional electrical sensor, the sensor does not need repeated wiring, can flexibly insert and extract the grain pile, adapts to the scene of the granary, improves the robustness of the system and reduces the maintenance cost.
Description
Technical Field
The utility model relates to a granary temperature measurement field, concretely relates to be applied to distributed optical fiber temperature measurement system based on spontaneous raman scattering effect of granary.
Background
In common words: food plays an important role in people's life. The incompatible contradiction exists between seasonal discontinuous grain production and continuous grain consumption throughout the year, and moreover, the quality guarantee period of the grain is limited, so that the safe and healthy storage of the grain is difficult to realize. Whether the grains can be safely stored or not is the most important temperature, and the grains can be mildewed due to the temperature rise, so that the grains are easily damaged in a large range.
At present, a domestic granary temperature measurement system mainly adopts a cable temperature measurement method, and the problems of high fault rate of temperature sensing cables, inconvenience in maintenance, large temperature measurement error, long time, easy temperature drift and the like exist.
The optical fiber sensing technology is a new sensing technology accompanied with the development of optical fiber and optical fiber communication technology. Is the fastest high-tech application technology internationally developed since the middle of the 70 s of the 20 th century. The fiber optic SENSOR (FOS fiber SENSOR) is essentially different from an electrical based SENSOR, and has the following characteristics: 1) the sensor is free from electromagnetic interference and corrosion-resistant, 2) passive real-time monitoring, electric insulation and good explosion-proof performance, 3) small volume, light weight, flexible, 4) high sensitivity, long service life, 5) long transmission distance and convenient maintenance.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a simple structure's that can be applied to the granary distributed optical fiber temperature measurement system, improve the measurement performance of granary to effective reduce cost.
In order to solve the technical problem, the utility model discloses a technical scheme be: a distributed optical fiber temperature measurement system applied to a granary comprises a pulse laser, a light splitting module, a photomultiplier, a sensing optical fiber and a signal processing module; the pulse laser is used for generating laser pulses to be incident into the sensing optical fiber; the light splitting module is used for filtering Rayleigh scattered light backscattered by the sensing optical fiber and transmitting anti-stokes signal light sensitive to temperature and stokes reference light insensitive to temperature; the photomultiplier is used for receiving the signal light transmitted through the light splitting module and is connected with the signal processing module; the signal processing module calculates the temperature according to the ratio of the two light transmittances and acquires and measures the echo time of the scattering signal to determine the optical fiber position corresponding to the scattering signal; each row of fixed boxes corresponds to one sensing optical fiber, each sensing optical fiber connects the fixed boxes in one row in series, and the fixed boxes can axially fix the sensing optical fibers at connection points; the sensing optical fiber is positioned at the grain pile part and comprises a vertical section and a horizontal section, the horizontal section is arranged along the bottom of the grain pile, and the vertical section is respectively positioned at two ends of the horizontal section.
Furthermore, fixed box includes a bottom plate and a curb plate, all is provided with the via hole on bottom plate and the curb plate, and the bottom plate setting is on the grain heap surface, and the via hole on the bottom plate is used for leading in sensing optical fiber or deriving the grain heap, and sensing optical fiber bends between two via holes.
Furthermore, still include a plurality of fixed pull rings, fixed pull ring is located the grain heap bottom and is located under fixed box, is provided with the ring on the fixed pull ring outer peripheral face, and sensing optical fiber passes the ring and fixes on fixed pull ring.
According to the above technical scheme, the utility model has the advantages of it is following: the temperature change of each point along the optical fiber within the full-length 10km range can be monitored, the monitoring distance is long, the position of a temperature abnormal point can be accurately positioned, and the highest spatial resolution can be up to 0.5 m. The temperature resolution reaches 0.5 ℃, and the temperature precision is 1 ℃; compared with the traditional electrical sensor, the optical fiber is not required to be repeatedly wired, can be flexibly inserted into and pulled out of a grain stack, adapts to the scene of a granary, improves the robustness of the system and reduces the maintenance cost; optical signal transmission, complete electrical insulation, intrinsic safety and electromagnetic interference resistance; the material of the fumigation agent has strong corrosion resistance, and the fumigation agent does not need to be taken out specially when the granary is fumigated, so that the working efficiency of granary custodians is improved.
Drawings
FIG. 1 is a plan view of the utility model when it is laid on a bungalow barn;
fig. 2 is a front view of the utility model when being laid on the bungalow granary.
Detailed Description
The following description will specifically explain embodiments of the present invention with reference to the accompanying drawings.
The utility model discloses a distributed optical fiber temperature measurement system based on spontaneous Raman scattering effect, which is applied to a granary, comprising a pulse laser, a light splitting module, a photomultiplier, a sensing optical fiber and a signal processing module; the pulse laser is used for generating high-power narrow-pulse-width laser pulses LD to be incident into the sensing optical fiber; the light splitting module is a Raman filter and is used for filtering Rayleigh scattered light backscattered by the sensing optical fiber and transmitting temperature-sensitive anti-stokes signal light and temperature-insensitive stokes reference light; the photomultiplier is used for receiving the signal light that passes through the light splitting module to light signal amplification, convert light signal into the signal processing module with the signal transmission again. The signal processing module calculates the temperature according to the ratio of the two light transmittances, an OTDR unit based on optical time domain reflection is integrated in the signal processing module, and the optical fiber position corresponding to the scattering signal can be determined by acquiring and measuring the echo time of the scattering signal by using high-speed data.
As shown in fig. 1 and 2. The utility model discloses still include a plurality of fixed boxes 2, fixed box 2 sets up and arranges at grain heap top surface and 4 lines of 6 rows. Each row of fixed boxes 2 corresponds to one sensing optical fiber 1, each sensing optical fiber 1 connects the fixed boxes in one row in series, and the fixed boxes 2 can axially fix the sensing optical fibers at connection points; the sensing optical fiber 1 is positioned on the grain pile and comprises a vertical section and a horizontal section, the horizontal section is arranged along the bottom of the grain pile, and the vertical section is respectively positioned at two ends of the horizontal section.
Taking the example that one granary comprises 2 channels, one channel (corresponding to 1 optical fiber) can monitor a row of monitoring points in one direction in one channel. The distributed temperature measurement host in the scheme can support 16 channels at most, and can support and monitor 4 channels and 2 grain bins if 4 rows of monitoring points are needed according to one channel, so that the cost is greatly reduced.
Every fixed box 2 includes a bottom plate and a curb plate, all is provided with the via hole on bottom plate and the curb plate, and the bottom plate setting is piled the surface at the grain, and fixed box can prevent except playing the fixed action to sensing optical fiber that optical fiber from being drawn into the grain completely and piling, can adopt screw assembly to fix optical fiber in the via hole. The through holes on the bottom plate are used for leading the sensing optical fibers into or out of the grain pile, the sensing optical fibers are bent into an arc shape between the two through holes, and the surface of the sensing optical fibers is excessively bent and damaged.
The outer peripheral surface of the fixed pull ring is provided with a plurality of small rings 5 which are arranged along the radial direction, and the tube penetrating optical fiber passes through the small rings 5 and is arranged on the fixed pull ring through the small rings.
The utility model discloses need select the optic fibre that both accords with measurement accuracy requirement and economy in the implementation process, when the granary was used, can be according to the granary size and nimble installation to the requirement of point of measuring temperature for the inside temperature variation of real-time supervision granary.
Claims (3)
1. A distributed optical fiber temperature measurement system applied to a granary comprises a pulse laser, a light splitting module, a photomultiplier, a sensing optical fiber and a signal processing module; the pulse laser is used for generating laser pulses to be incident into the sensing optical fiber; the light splitting module is used for filtering Rayleigh scattered light backscattered by the sensing optical fiber and transmitting anti-stokes signal light sensitive to temperature and stokes reference light insensitive to temperature; the photomultiplier is used for receiving the signal light transmitted through the light splitting module and is connected with the signal processing module; the signal processing module calculates the temperature according to the ratio of the two light transmission rates, acquires and measures the echo time of the scattering signal and determines the position of the optical fiber corresponding to the scattering signal, and is characterized in that: the grain pile is characterized by also comprising fixed boxes, wherein the fixed boxes are arranged on the top surface of the grain pile and are arranged in multiple rows and multiple columns; each row of fixed boxes corresponds to one sensing optical fiber, each sensing optical fiber connects the fixed boxes in one row in series, and the fixed boxes can axially fix the sensing optical fibers at connection points; the sensing optical fiber is positioned at the grain pile part and comprises a vertical section and a horizontal section, the horizontal section is arranged along the bottom of the grain pile, and the vertical section is respectively positioned at two ends of the horizontal section.
2. The distributed optical fiber temperature measurement system applied to the granary according to claim 1, wherein: the fixed box comprises a bottom plate and a side plate, through holes are formed in the bottom plate and the side plate, the bottom plate is arranged on the surface of the grain pile, the through holes in the bottom plate are used for leading the sensing optical fibers into or out of the grain pile, and the sensing optical fibers are bent between the two through holes.
3. The distributed optical fiber temperature measurement system applied to the granary according to claim 1, wherein: still include a plurality of fixed pull rings, fixed pull ring is located the grain heap bottom and is located fixed box under, is provided with the ring on the fixed pull ring outer peripheral face, and sensing optical fiber passes the ring and fixes on fixed pull ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922152332.2U CN211401477U (en) | 2019-12-04 | 2019-12-04 | Distributed optical fiber temperature measurement system applied to granary |
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| CN201922152332.2U CN211401477U (en) | 2019-12-04 | 2019-12-04 | Distributed optical fiber temperature measurement system applied to granary |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323335A (en) * | 2022-03-16 | 2022-04-12 | 浙江大学湖州研究院 | Distributed optical fiber temperature measurement system for high-temperature pipeline group |
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2019
- 2019-12-04 CN CN201922152332.2U patent/CN211401477U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323335A (en) * | 2022-03-16 | 2022-04-12 | 浙江大学湖州研究院 | Distributed optical fiber temperature measurement system for high-temperature pipeline group |
| CN114323335B (en) * | 2022-03-16 | 2022-06-21 | 浙江大学湖州研究院 | Distributed optical fiber temperature measurement system for high-temperature pipeline group |
| WO2023173609A1 (en) * | 2022-03-16 | 2023-09-21 | 浙江大学湖州研究院 | Distributed optical fiber temperature measurement system for high-temperature pipeline group |
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