CN111579113A - Temperature field measuring device and method - Google Patents
Temperature field measuring device and method Download PDFInfo
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- CN111579113A CN111579113A CN201910121043.8A CN201910121043A CN111579113A CN 111579113 A CN111579113 A CN 111579113A CN 201910121043 A CN201910121043 A CN 201910121043A CN 111579113 A CN111579113 A CN 111579113A
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- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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Abstract
The invention provides a temperature field measuring device and a temperature field measuring method. The temperature field measuring device includes: the fiber grating array is packaged with a capillary glass tube and used for detecting an optical signal converted from the temperature change of the liquid to be detected; and the signal processing unit comprises a light source and a spectrometer module and is used for demodulating the temperature information of the liquid to be measured from the optical signal. The temperature field measuring device and the temperature field measuring method adopt a glass tube packaging mode, so that the temperature field measuring device and the temperature field measuring method are in non-contact with liquid to be measured, the sensitivity of temperature measurement of the liquid to be measured is improved, and the influence of pressure and other external conditions on the measurement is eliminated, so that the measurement accuracy is improved, and the packaging steps are reduced. In addition, the optical signal measurement and transmission are integrated, and the fiber bragg gratings are arranged in an array form, so that the purpose of remote real-time monitoring is achieved.
Description
Technical Field
The invention relates to the technical field of temperature measurement, in particular to a temperature field measuring device and method.
Background
The temperature of the liquid to be measured is an important parameter, and the temperature distribution condition of the whole liquid to be measured can be directly reflected. The temperature of the liquid to be measured is accurately measured, and the method has important significance for researching the overall temperature distribution condition of the liquid to be measured. A mixed layer is formed on the surface of the liquid to be detected due to the stirring effect of wind power, the thickness of the mixed layer is usually 10-200m, and if the temperature distribution condition of the liquid to be detected within the range of 5cm on the surface of the liquid to be detected is known, the temperature distribution condition of the liquid to be detected within the range of 10-200m of the liquid to be detected can be deduced.
At present, except for an electrical CTD instrument, the most common passive optical device for measuring the temperature of the liquid to be measured is an optical fiber sensor, and the existing optical fiber sensor developed in the measurement of the temperature of the liquid to be measured is a sensor based on an optical fiber grating, in particular a sensor made of the optical fiber grating with a short period (wherein the period lambda is less than 1 mu m). Compared with the long-period fiber grating, the short-period fiber grating has the advantages of being provided with the same end for transmitting and receiving optical signals, resistant to bending, easy to manufacture and the like. After the short-period fiber grating is subjected to sensitization packaging, the reflection peak of the short-period fiber grating has sensitivity to the temperature of the liquid to be measured, but because the fiber grating has sensitivity to temperature, pressure and other external conditions, the sensitization needs to be considered during packaging, and the influence of the pressure and other external conditions on measurement needs to be eliminated, so that the packaging steps are increased.
Disclosure of Invention
Technical problem to be solved
In view of the above technical problems, the present invention provides a temperature field measuring device and method to at least partially solve the above technical problems.
(II) technical scheme
According to one aspect of the present invention, a temperature field measuring device is provided. The temperature field measuring device includes:
the fiber grating array is packaged with a capillary glass tube and used for detecting an optical signal converted from the temperature change of the liquid to be detected; and
and the signal processing unit comprises a light source and a spectrometer module and is used for demodulating the temperature information of the liquid to be measured from the optical signal.
In some embodiments, each fiber grating in the fiber grating array is a short-period fiber grating and the period Λ < 1 μm.
In some embodiments, the fiber grating array includes a plurality of short-period fiber gratings that are equally spaced apart.
In some embodiments, an optical splitter is also included for transmitting the optical signal detected by the fiber grating array.
In some embodiments, the liquid temperature measuring device further comprises a signal transmitting unit, wherein the signal transmitting unit is used for transmitting the temperature information of the liquid to be measured demodulated by the signal processing unit to the receiving device.
In some embodiments, the optical fiber grating optical splitter further comprises a carrying device for embedding the optical fiber grating array, the optical splitter, the signal processing unit and the signal transmitting unit.
In some embodiments, the capillary glass tube is closed at one end, the closed end is located outside the ride, and the open end is located inside the ride and is sealed with glue.
In some embodiments, one end of the optical splitter is connected to the corresponding group of the fiber gratings by a jumper, the other end is connected to one end of the signal processing unit by a jumper, and the other end of the signal processing unit is connected to one end of the signal transmitting unit by a jumper.
In some embodiments, the ride feature has a counterweight.
According to another aspect of the present invention, a temperature field measuring method is provided. The method comprises the following steps:
the temperature change of the liquid to be measured is transmitted to the short-period fiber bragg grating in the capillary glass tube, so that the reflection peak of the short-period fiber bragg grating shifts, and the conversion from the temperature change of the liquid to be measured to an optical signal is completed;
the optical signal is transmitted to the signal processing unit through the optical splitter;
a spectrometer module in the signal processing unit collects wave crests of the optical signals, and corresponding demodulation programs demodulate corresponding temperature information of the liquid to be detected from the wave crests of the optical signals to complete the conversion from the optical signals to the temperature information of the liquid to be detected; and
the temperature information of the liquid to be measured is transmitted to the receiving equipment by the signal transmitting unit
In some embodiments, the fiber gratings are connected in series or in parallel to form a fiber grating array.
In some embodiments, a packet of optical signals detected by the fiber grating array enters a corresponding optical splitter.
(III) advantageous effects
According to the technical scheme, the temperature field measuring device and the temperature field measuring method have one of the following beneficial effects:
(1) the glass tube packaging mode is adopted, so that the influence of pressure and other external conditions on measurement is eliminated;
(2) the device immersed in the liquid to be measured is only the fiber bragg grating, and has the advantages of small volume, low cost, electric insulation, no power consumption, long-term reuse and the like;
(3) the temperature field of 5cm on the surface of the liquid to be detected can be detected in real time, which is beneficial supplement to the detection of the temperature of the surface of the liquid to be detected;
(4) the whole device is transmitted by optical fibers and optical devices, and has the advantages of high speed, high precision and no electromagnetic interference.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent from the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, which are not intended to be drawn to scale, emphasis instead being placed upon illustrating the principles of the disclosure.
FIG. 1 is a schematic structural diagram of a temperature field measuring apparatus according to an embodiment of the present invention, in which the number of fiber gratings connected in parallel is 48;
FIG. 2 is a schematic structural diagram of a temperature field measuring apparatus according to an embodiment of the present invention, in which the number of fiber gratings connected in parallel is 24;
FIG. 3 is a schematic structural diagram of a temperature field measuring apparatus according to an embodiment of the present invention, in which the number of fiber gratings connected in parallel is 12;
fig. 4 is a schematic structural diagram of a temperature field measuring apparatus according to an embodiment of the present invention, wherein each group of fiber gratings is connected in series to a signal processing unit.
< description of reference >
1-capillary glass tube 2-fiber grating 3-optical splitter 4, 6-jumper 5-signal processing unit 7-signal transmitting unit 8-riding device
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The temperature of the liquid to be measured is an important parameter, and the temperature distribution condition of the whole liquid to be measured can be directly reflected. The temperature of the liquid to be measured is accurately measured, and the method has important significance for researching the overall temperature distribution condition of the liquid to be measured. A mixed layer is formed on the surface of the liquid to be detected due to the stirring effect of wind power, the thickness of the mixed layer is usually 10-200m, and if the temperature distribution condition of the liquid to be detected within the range of 5cm on the surface of the liquid to be detected is known, the temperature distribution condition of the liquid to be detected within the range of 10-200m of the liquid to be detected can be deduced.
At present, except for an electrical CTD instrument, the most common passive optical device for measuring the temperature of the liquid to be measured is an optical fiber sensor, and the existing optical fiber sensor developed in the measurement of the temperature of the liquid to be measured is a sensor based on an optical fiber grating, in particular a sensor made of the optical fiber grating with a short period (wherein the period lambda is less than 1 mu m). Compared with the long-period fiber grating, the short-period fiber grating has the advantages of being provided with the same end for transmitting and receiving optical signals, resistant to bending, easy to manufacture and the like. After the short-period fiber grating is subjected to sensitization packaging, the reflection peak of the short-period fiber grating has sensitivity to the temperature of the liquid to be measured, but because the fiber grating has sensitivity to temperature, pressure and other external conditions, the sensitization needs to be considered during packaging, and the influence of the pressure and other external conditions on measurement needs to be eliminated, so that the packaging steps are increased. Based on the above, the temperature field measuring device and method provided by the invention are improved over the existing sensor made of the short-period fiber grating aiming at the sensitivity of the short-period fiber grating to temperature, pressure and other external conditions, and the innovation point is that the device and method adopt a glass tube packaging mode to enable the device and method to be in non-contact with the liquid to be measured, so that the sensitivity of the temperature measurement of the liquid to be measured is improved, the influence of the pressure and other external conditions on the measurement is eliminated, the measurement accuracy is improved, and the packaging steps are reduced. In addition, the optical signal measurement and transmission are integrated, and the fiber bragg gratings are arranged in an array form, so that the purpose of remote real-time monitoring is achieved.
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
In one exemplary embodiment of the present invention, a temperature field measuring device is provided. Fig. 1 is a schematic structural diagram of a temperature field measuring apparatus according to an embodiment of the present invention, in which the number of fiber gratings connected in parallel is 48. The temperature field measuring device comprises a fiber grating array 2, an optical splitter 3, a signal processing unit 5, a signal transmitting unit 7 and a riding device 8.
Specifically, the fiber grating array 2 is used for detecting an optical signal converted from the temperature change of the liquid to be detected, and is formed by arranging a plurality of fiber gratings at equal intervals, wherein the plurality of fiber gratings are short-period fiber gratings, the reflection peak of the short fiber gratings has the sensitivity characteristic to the temperature but also has the sensitivity to the pressure and some other external conditions, the contact with the liquid to be detected is avoided by utilizing the capillary glass tube 1 with one closed end, the influence of the pressure and some other external conditions on the measurement of the invention is solved, wherein the closed end of the capillary glass tube 1 is positioned outside the boarding device 8 and is contacted with the liquid to be detected, and the open end is positioned inside the boarding device 8 and is sealed by glue. Wherein the short-period fiber grating and the externally packaged capillary glass tube 1 form a liquid temperature field sensor to be measured.
Specifically, the optical splitter 3 is used to transmit an optical signal detected by the fiber grating array 2. One end of the optical splitter 3 is connected with the corresponding group of fiber gratings through a jumper wire, and the other end is connected with one end of a signal processing unit 5 through a jumper wire 4. Because the wavelength of each group of fiber bragg gratings is not interfered with each other, each group of fiber bragg gratings is divided into different channels, and the optical signals detected by the fiber bragg grating array 2 enter the corresponding optical branching device 3 in groups and are transmitted to the signal processing unit 5 through the optical branching device 3.
Specifically, the signal processing unit 5 includes a light source and a spectrometer module, wherein the spectrometer module collects a peak of the optical signal, the corresponding demodulation program demodulates the corresponding temperature information of the liquid to be measured from the peak of the optical signal, so as to complete the conversion from the optical signal to the temperature information of the liquid to be measured, and the other end of the signal processing unit 5 is connected to a signal transmitting unit 7 through a jumper 6.
Specifically, the signal transmitting unit 7 is configured to transmit the temperature information of the liquid to be measured demodulated by the signal processing unit 5 to the receiving device in real time, so that the temperature information of the liquid to be measured can be received on the ground in real time.
Specifically, the boarding device 8 is used for embedding the fiber grating array 2, the optical splitter 3, the signal processing unit 5 and the signal transmitting unit 7, and has a certain balance weight according to the range of 5cm deep into the liquid to be measured so as to ensure that the temperature field measuring device floats on the sea surface and the fiber grating array 2 is submerged. The mounting device 8 has sealing performance, and when the fiber grating array 2 is embedded into the mounting device 8, the capillary glass tube 1 and the mounting device 8 are sealed by glue, so that the electrical insulation of electric devices in the mounting device 8 is ensured.
In another exemplary embodiment of the present invention, a temperature field measurement method is provided. The working principle of the temperature field measuring method of the invention is as follows: the temperature change of the liquid to be measured is transmitted to the short-period fiber grating array 2 in the capillary glass tube 1, so that the reflection peak of the short-period fiber grating array 2 shifts, and the conversion from the temperature change of the liquid to be measured to an optical signal is completed; because the wavelengths of each group of fiber gratings are not interfered with each other, each group of fiber gratings are transmitted to the signal processing unit 5 through the optical splitter 3 through different channels; the spectrometer module of the signal processing unit 5 collects the wave peak of the optical signal, and the corresponding demodulation program demodulates the corresponding temperature information of the liquid to be measured from the wave peak of the optical signal, so as to complete the conversion from the optical signal to the temperature information of the liquid to be measured; the temperature information of the liquid to be measured is transmitted to the receiving device through the signal transmitting unit 7. Because the relative position information of each fiber grating is known in advance, the temperature data corresponding to the position can be known. Because the liquid to be measured flows at any moment, the absolute position of the fiber bragg grating embedded in the carrying device 8 in the liquid to be measured cannot be determined, but the carrying weight is calculated by taking the fact that the first fiber bragg grating just does not pass through the water surface as a standard during manufacturing, and the surface temperature of the liquid to be measured has continuity, so that the temperature of each position point can be basically represented by respectively collecting a certain amount of temperature data of the fiber bragg gratings at the position points at different time and averaging the temperature data.
In order to make the objects, technical solutions and advantages of the present disclosure more apparent, the temperature field measuring method is further described below with reference to the accompanying drawings in combination with specific embodiments.
Example 1
Fig. 1 is a schematic structural diagram of a temperature field measuring apparatus according to an embodiment of the present invention, wherein each group of fiber gratings is connected in parallel to a signal processing unit 5. In fig. 1, 48 fiber gratings sensitive to the temperature of the liquid to be measured are connected in an equidistant manner to form a fiber grating array 2 of the device, and every two fiber gratings are spaced by 1 cm. The fiber bragg grating is packaged by a capillary glass tube 1 with one closed end, the closed end is positioned outside the boarding device 8, and the open end is positioned inside the boarding device 8 and sealed by glue. The fiber gratings are connected to one end of the optical splitters 3 through jumpers, and the optical signals detected by the 48 fiber gratings enter the corresponding optical splitters 3 respectively in 4 groups, wherein the splitting ratio of the splitter 3 is 12: 1, that is, each optical splitter 3 corresponds to one group, namely 12 fiber gratings. The other end of the optical splitter 3 is connected to 4 channels of the signal processing unit 5 through a jumper 4, the wavelengths of the fiber gratings in each channel of the 4 channels are not interfered with each other, so that temperature information recorded by each liquid temperature field sensor to be measured can be demodulated, temperature data of different position points can be obtained, and the temperatures of the position points can be obtained respectively by acquiring a certain amount of temperature data of the fiber gratings at the position points at different time and averaging the temperature data. The temperature information of the liquid to be measured obtained by the signal processing unit 5 is transmitted to the signal transmitting unit 7, and is transmitted to the receiving device by the signal transmitting unit 7. Therefore, the purpose of real-time monitoring can be achieved by continuously receiving the measured temperature information of the liquid to be measured through the receiving device.
Similarly, the schematic structural diagrams of the temperature field measuring devices in fig. 2 and 3 are similar to fig. 1, except that the numbers of the fiber gratings connected at equal intervals in fig. 2 and 3 are respectively 24 and 12, the fiber gratings are respectively spaced apart by 2cm and 4cm, and the splitting ratios of the optical splitters are respectively 6: 1 and 3: 1.
Example 2
Fig. 4 is a schematic structural diagram of a temperature field measuring device according to an embodiment of the invention. Wherein each group of fiber bragg gratings is connected in series with the signal processing unit 5. Compared with the parallel connection form of each group of fiber gratings in the embodiment 1, the embodiment 2 changes the form of connecting each group of fiber gratings in series, so that the step of connecting the optical splitter 3 is omitted, the first fiber grating of each group is directly connected to 4 channels of the signal processing unit 5, other structures of the embodiment 2 are basically the same as those of the embodiment 1, and the description of the same structures is omitted here. The differences and advantages and disadvantages of the two are listed: the packaging of the fiber bragg grating in the embodiment 1 is simple, the capillary glass tube packaging 1 is only used as an external seal, and the adhesive is coated between the capillary glass tube packaging 1 and the carrying device 8 for sealing so as to ensure the drying and insulation of an internal electronic device; in the embodiment 2, two sections of the capillary glass tubes 1 with the openings are used for packaging, the openings are sealed by gluing, each group of fiber gratings are connected in series in an end-to-end mode, and the fiber gratings exposed in the liquid to be tested are packaged by loose tubes, so that the packaging steps are increased in the embodiment 2 compared with the embodiment 1, but the optical splitter 3 is saved due to the fact that the series connection mode achieves automatic splitting.
While the above embodiments set forth numerous details, such details should not be construed as limitations on the scope of the claimed invention or of what may be claimed, but merely as descriptions of features specific to particular embodiments.
In summary, the temperature field measuring device and method provided by the invention are improved over the existing sensor made of the short-period fiber grating aiming at the sensitivity of the short-period fiber grating to temperature, pressure and other external conditions, and the innovation point is that the device and method adopt a glass tube packaging mode to enable the device and method to be in non-contact with the liquid to be measured, so that the sensitivity of the temperature measurement of the liquid to be measured is improved, and the influence of the pressure and other external conditions on the measurement is eliminated, thereby improving the measurement accuracy and reducing the packaging steps. In addition, the optical signal measurement and transmission are integrated, and the fiber bragg gratings are arranged in an array form, so that the purpose of remote real-time monitoring is achieved.
So far, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. From the above description, those skilled in the art should clearly recognize the present disclosure. It is worthy to note, however, that any particular value in all examples shown and described herein is to be construed as merely illustrative, and not a limitation, such that other examples of the illustrative embodiments may have different values.
It is to be noted that, in the attached drawings or in the description, the implementation modes not shown or described are all the modes known by the ordinary skilled person in the field of technology, and are not described in detail. In addition, the definitions of the elements are not limited to the specific structures, shapes or modes mentioned in the embodiments, and those skilled in the art may easily modify or replace them.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that is, the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
The above-mentioned embodiments are intended to illustrate the objects, aspects and advantages of the present disclosure in further detail, and it should be understood that the above-mentioned embodiments are only illustrative of the present disclosure and are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (12)
1. A temperature field measuring device, comprising:
the fiber grating array is packaged with a capillary glass tube and used for detecting an optical signal converted from the temperature change of the liquid to be detected; and
and the signal processing unit comprises a light source and a spectrometer module and is used for demodulating the temperature information of the liquid to be measured from the optical signal.
2. The temperature field measuring device of claim 1, wherein each fiber grating in the fiber grating array is a short-period fiber grating and a period Λ < 1 μm.
3. The temperature field measuring device of any one of claims 1-2, wherein the fiber grating array comprises a plurality of short-period fiber gratings that are equally and unequally spaced apart.
4. The temperature field measuring device of claim 1, further comprising an optical splitter for transmitting the optical signal detected by the fiber grating array.
5. The temperature field measuring device of claim 4, further comprising a signal transmitting unit for transmitting the temperature information of the liquid to be measured demodulated by the signal processing unit to a receiving device.
6. The temperature field measuring device according to claim 5, further comprising a riding device for embedding the fiber grating array, the optical splitter, the signal processing unit, and the signal transmitting unit.
7. The temperature field measuring device of claim 6, wherein the capillary glass tube is closed at one end, the closed end is located outside the ride, and the open end is located inside the ride and sealed with glue.
8. The temperature field measuring device of claim 5, wherein one end of the optical splitter is connected to the corresponding group of fiber gratings by a jumper wire, the other end is connected to one end of the signal processing unit by a jumper wire, and the other end of the signal processing unit is connected to one end of the signal transmitting unit by a jumper wire.
9. The temperature field measuring device of claim 6 or 7, wherein the ride feature has a counterweight.
10. The measurement method of the temperature field measurement device according to any one of claims 1 to 9, comprising the steps of:
the temperature change of the liquid to be measured is transmitted to the short-period fiber bragg grating in the capillary glass tube, so that the reflection peak of the short-period fiber bragg grating shifts, and the conversion from the temperature change of the liquid to be measured to an optical signal is completed;
the optical signal is transmitted to the signal processing unit through the optical splitter;
a spectrometer module in the signal processing unit collects wave crests of the optical signals, and corresponding demodulation programs demodulate corresponding temperature information of the liquid to be detected from the wave crests of the optical signals to complete the conversion from the optical signals to the temperature information of the liquid to be detected; and
the temperature information of the liquid to be measured is transmitted to the receiving device through the signal transmitting unit.
11. The temperature field measuring method according to claim 10, wherein the fiber gratings are connected in series or in parallel to constitute a fiber grating array.
12. The method of claim 10, wherein the optical signal packets detected by the fiber grating array enter corresponding optical splitters.
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Application publication date: 20200825 |