CN212844061U - Optical fiber temperature measurement system based on fluorescence characteristics of erbium-doped optical fiber - Google Patents
Optical fiber temperature measurement system based on fluorescence characteristics of erbium-doped optical fiber Download PDFInfo
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- CN212844061U CN212844061U CN202021202717.1U CN202021202717U CN212844061U CN 212844061 U CN212844061 U CN 212844061U CN 202021202717 U CN202021202717 U CN 202021202717U CN 212844061 U CN212844061 U CN 212844061U
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Abstract
The utility model discloses an optic fibre temperature measurement system based on erbium-doped fiber fluorescence characteristic, including the current driver, current driver and laser diode are connected, and laser diode and optical power distributor input port are connected, and the output port of optical power distributor is connected with optical power meter A and wavelength division multiplexer respectively, and wavelength division multiplexer is connected with high temperature resistant erbium-doped fiber and optical power meter B respectively, and optical power meter A and optical power meter B are connected with sampling circuit respectively, and sampling circuit is connected with the singlechip. According to the optical fiber temperature measurement system based on the fluorescence characteristic of the erbium-doped optical fiber, 90% of light energy input into the optical power distributor from the laser diode is output to the port A of the wavelength division multiplexer, 10% of the light energy enters the optical power meter A, two groups of light intensities are linearly converted into current signals to be output and simultaneously enter the sampling circuit, the ratio of current signal output results of two channels of the sampling circuit is calculated by the single chip microcomputer, and the measured temperature can be accurately calculated through the result of the ratio.
Description
Technical Field
The utility model relates to an optic fibre temperature measurement system technical field specifically is an optic fibre temperature measurement system based on erbium-doped fiber fluorescence characteristic.
Background
Most of the transformer internal temperature detection methods in the market at present are based on that fluorescent powder is bonded to the end face of an ultraviolet quartz optical fiber through an adhesive, temperature detection is carried out by detecting the fluorescent intensity or fluorescent time of the fluorescent powder, the adhesive is easily decomposed when the temperature is too high, the insulating property of transformer oil can be influenced, the temperature measurement range is limited, the temperature measurement of the fluorescent powder is point-type temperature measurement, the optical fiber transmission part does not have temperature sensing capacity, the ultraviolet quartz optical fiber is expensive, the bending radius is large, the optical fiber is easy to break, the cost is high, and aiming at the defects, it is necessary to design an optical fiber temperature measurement system based on the fluorescent characteristic of an erbium-doped optical fiber.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an optic fibre temperature measurement system based on erbium-doped fiber fluorescence characteristic, whole optic fibre all have temperature sensing ability, and the sensor head part does not use adhesive or phosphor powder, and small, with low costs, measurement temperature range are big, the interference killing feature is strong, can solve the problem among the prior art.
In order to achieve the above object, the utility model provides a following technical scheme:
an optical fiber temperature measurement system based on the fluorescence characteristics of erbium-doped optical fibers comprises a current driver, wherein the current driver is electrically connected with a laser diode, the laser diode is electrically connected with an input port of an optical power distributor, an output port of the optical power distributor is respectively electrically connected with an optical power meter A and a wavelength division multiplexer, the wavelength division multiplexer is respectively electrically connected with a high-temperature-resistant erbium-doped optical fiber and an optical power meter B, the optical power meter A and the optical power meter B are respectively electrically connected with a sampling circuit, and the sampling circuit is electrically connected with a single chip microcomputer;
the laser diode consists of a laser chip, a tube seat and a tube cap semiconductor laser diode, wherein the center of the tube seat is provided with the laser chip which is attached to a heat sink for heat dissipation, the semiconductor laser diode is sealed on the tube seat close to the lower part of the laser chip, and the upper surface of the tube seat is fixed with the tube cap and covers the laser chip inside;
the wavelength division multiplexer is provided with three ports, the left side surface is provided with a port A, the right side surface is provided with a port B, and the front surface is provided with a port C;
the upper end of the optical power distributor is provided with an input port, and the lower end of the optical power distributor is provided with an output port A and an output port B respectively.
Preferably, the high-temperature-resistant erbium-doped fiber is a single-mode quartz-doped erbium ion fiber, and the end face is a cutting plane perpendicular to the input direction of the fiber.
Preferably, the port a is an input optical channel, the port B is a bidirectional full-band optical channel, and the port C is an output optical channel.
Preferably, the optical power meter a is a silicon-based optical power meter, and the optical power meter B is an InGaAsP optical power meter.
Compared with the prior art, the beneficial effects of the utility model are as follows:
the optical fiber temperature measurement system based on the fluorescence characteristic of the erbium-doped optical fiber is characterized in that a current driver is a constant current drive output device and is specially used for providing stable working current for a laser diode and keeping stable power output by the laser diode, 90% of light energy input into an optical power distributor from the laser diode is output to a port A of a wavelength division multiplexer, enters a high-temperature-resistant erbium-doped optical fiber after being output from a port B of the wavelength division multiplexer, fluorescence is reflected at the output end face of the high-temperature-resistant erbium-doped optical fiber, then is reversely transmitted and returns to the port B of the wavelength division multiplexer again, and is finally output from a port C of the wavelength division multiplexer, a fluorescence signal output from the port C of the wavelength division multiplexer enters an optical power meter B, and the light energy of the optical power distributor, wherein 10% of the light energy enters the optical power meter A, and two groups of light intensity, the sampling result of the sampling circuit is output to the single chip microcomputer, the single chip microcomputer calculates the ratio of the current signal output results of the two channels of the sampling circuit, the measured temperature can be accurately calculated through the result of the ratio, the sensing optical fiber part in the whole system does not contain any adhesive or fluorescent powder, and the system has the characteristics of electromagnetic interference resistance, capability of operating in a high-voltage environment, small size, long service life, low cost, large measurement temperature range, strong anti-interference capability, distributed measurement and the like, and is particularly suitable for detecting the internal temperature of the power transformer.
Drawings
FIG. 1 is a connection diagram of the whole module of the present invention;
FIG. 2 is a schematic view of a partial structure of the present invention;
FIG. 3 is a schematic view of a partial structure of the present invention;
fig. 4 is a schematic view of a partial structure of the present invention.
In the figure: 1. a single chip microcomputer; 2. a current driver; 3. a laser diode; 4. an optical power splitter; 5. a wavelength division multiplexer; 6. high temperature resistant erbium doped fiber; 7. an optical power meter A; 8. an optical power meter B; 9. a sampling circuit; 10. a laser chip; 11. a tube holder; 12. a pipe cap; 13. a semiconductor laser diode; 14. port A; 15. a port B; 16. a port C; 17. an input port; 18. an output port A; 19. and an output port B.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-4, an optical fiber temperature measurement system based on the fluorescence characteristics of an erbium-doped optical fiber includes a current driver 2, the current driver 2 is connected to a laser diode 3, the current driver 2 is a constant current driving output device, and is specially used for providing a stable working current to the laser diode 3 and maintaining a stable power output from the laser diode 3, the laser diode 3 is composed of a laser chip 10, a tube seat 11, a tube cap 12 and a semiconductor laser diode 13, the center of the tube seat 11 is provided with the laser chip 10 attached to a heat sink for dissipating heat, the semiconductor laser diode 13 is sealed on the tube seat 11 near the lower portion of the laser chip 10, the tube cap 12 is fixed on the upper surface of the tube seat 11 and the laser chip 10 is sleeved inside, the wavelength of the laser diode 3 is 980nm, the typical driving current is 0.5A, the typical output power is 50mW, the output coupling mode is a, the optical power distributor 4 is an optical device which distributes input optical signals to a plurality of ports for output according to a certain proportion, the upper end of the optical power distributor 4 is provided with an input port 17, the lower end of the optical power distributor 4 is respectively provided with an output port A18 and an output port B19, the distribution proportion is 1:9, a laser diode 3 is connected with the input port 17 of the optical power distributor 4, an output port A18 of the optical power distributor 4 is connected with an optical power meter A7, an output port B19 is connected with a port A14 of a wavelength division multiplexer 5, the wavelength division multiplexer 5 is a three-end optical device, a transmission optical fiber is a single-mode optical fiber, a port A14 is an input optical channel, the passing wave band is 980nm +/-20 nm, a port B15 is a bidirectional full-wave band optical channel, the passing wave band is 800-minus 1600nm, a port C16 is an output optical channel, the passing wave band is 1550nm +/-20 nm, the wavelength division multiplexer 5 is respectively, the high-temperature-resistant erbium-doped optical fiber 6 is a single-mode quartz erbium-doped optical fiber, 1550nm fluorescence can be excited under the condition of inputting high-power 980nm pump light, the end face is a cutting plane vertical to the input direction of the optical fiber to form reflectivity of more than 20%, the fluorescence intensity excited in the high-temperature-resistant erbium-doped optical fiber 6 is related to temperature under the condition of inputting optical signals with fixed intensity, the rule is that the fluorescence intensity is increased along with the increase of temperature, an optical power meter A7 and an optical power meter B8 are respectively connected with a sampling circuit 9, an optical power meter A7 is a silicon-based optical power meter, the peak response wavelength is 850nm, the responsivity at 980nm band is not lower than 0.8A/W, an optical power meter B8 is an InGaAs optical power meter, the peak response wavelength is 1550nm, the responsivity at 1550nm band is not lower than 0.9A/W, the sampling circuit 9 is connected with a single chip microcomputer 1, and the sampling circuit 9 is a dual-channel, the two paths of current signals can be converted into digital signals at the same time, the sensing optical fiber part in the whole system does not contain any adhesive or fluorescent powder, and the system has the characteristics of electromagnetic interference resistance, capability of operating in a high-voltage environment, small volume, long service life, low cost, large measurement temperature range, strong anti-interference capability, distributed measurement and the like, and is particularly suitable for detecting the internal temperature of the power transformer.
The working principle is as follows: the current driver 2 continuously provides stable working current for the laser diode 3, and the light energy input from the laser diode 3 to the optical power divider 4, wherein 90% of the light energy is output to the port a14 of the wavelength division multiplexer 5, enters the high temperature resistant erbium-doped fiber 6 after being output from the port B15 of the wavelength division multiplexer 5, under the action of 980nm laser, the fluorescence with the wavelength of 1550nm is excited inside the high temperature resistant erbium-doped fiber 6, the fluorescence is reflected at the output end face of the high temperature resistant erbium-doped fiber 6, then is transmitted reversely and returned to the port B15 of the wavelength division multiplexer 5, and finally is output from the port C16 of the wavelength division multiplexer 5, the fluorescence signal output from the port C16 of the wavelength division multiplexer 5 enters the optical power meter B8, the light intensity of which is linearly converted into a current signal output with the conversion efficiency of 0.9A/W, the light energy output from the laser diode 3 to the optical power divider 4, wherein 10% enters the optical power meter a7, the light intensity is linearly converted into current signals to be output with the conversion efficiency of 0.8A/W, two paths of current signals output by the optical power meter A7 and the optical power meter B8 enter the sampling circuit 9 at the same time, the sampling result of the sampling circuit 9 is output to the single chip microcomputer 1, the ratio of the current signal output results of the two channels of the sampling circuit 9 is calculated by the single chip microcomputer 1, the light intensity received by the optical power meter A7 is a reference value of the output power of the laser, the light intensity received by the optical power meter B8 is a fluorescence intensity value related to the measured temperature, and the measured temperature can be accurately calculated through the result of the ratio.
In summary, in the optical fiber temperature measurement system based on the erbium-doped fiber fluorescence characteristic, the current driver 2 is a constant current driving output device, and is specifically configured to provide a stable operating current to the laser diode 3, maintain the stable power output by the laser diode 3, and input 90% of light energy from the laser diode 3 to the optical power distributor 4, where the light energy enters the port a14 of the wavelength division multiplexer 5, enters the high temperature resistant erbium-doped fiber 6 after being output from the port B15 of the wavelength division multiplexer 5, the fluorescence is reflected at the output end face of the high temperature resistant erbium-doped fiber 6, then is reversely transmitted and returns to the port B15 of the wavelength division multiplexer 5, and finally is output from the port C16 of the wavelength division multiplexer 5, a fluorescence signal output from the port C16 of the wavelength division multiplexer 5 enters the optical power meter B8, and the light energy of the optical power distributor 4, where 10% enters the optical power meter a7, and two sets of light intensities are linearly converted into current signals and output and, the sampling result of the sampling circuit 9 is output to the single chip microcomputer 1, the single chip microcomputer 1 calculates the ratio of the current signal output results of the two channels of the sampling circuit 9, the measured temperature can be accurately calculated according to the result of the ratio, the sensing optical fiber part in the whole system does not contain any adhesive or fluorescent powder, and the system has the characteristics of electromagnetic interference resistance, capability of operating in a high-voltage environment, small size, long service life, low cost, large measurement temperature range, strong anti-interference capability, distributed measurement and the like, and is particularly suitable for detecting the internal temperature of the power transformer.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. An optical fiber temperature measurement system based on the fluorescence characteristics of an erbium-doped optical fiber comprises a current driver (2), and is characterized in that: the current driver (2) is electrically connected with the laser diode (3), the laser diode (3) is electrically connected with an input port (17) of the optical power distributor (4), an output port of the optical power distributor (4) is electrically connected with an optical power meter A (7) and a wavelength division multiplexer (5) respectively, the wavelength division multiplexer (5) is electrically connected with a high-temperature-resistant erbium-doped optical fiber (6) and an optical power meter B (8) respectively, the optical power meter A (7) and the optical power meter B (8) are electrically connected with the sampling circuit (9) respectively, and the sampling circuit (9) is connected with the single chip microcomputer (1);
the laser diode (3) consists of a laser chip (10), a tube seat (11), a tube cap (12) and a semiconductor laser diode (13), wherein the center of the tube seat (11) is provided with the laser chip (10) which is attached to a heat sink for heat dissipation, the semiconductor laser diode (13) is sealed on the tube seat (11) close to the lower part of the laser chip (10), the tube cap (12) is fixed on the upper surface of the tube seat (11), and the laser chip (10) is sleeved inside;
the wavelength division multiplexer (5) is provided with three ports, the left side surface is provided with a port A (14), the right side surface is provided with a port B (15), and the front surface is provided with a port C (16);
the upper end of the optical power distributor (4) is provided with an input port (17), and the lower end of the optical power distributor is provided with an output port A (18) and an output port B (19) respectively.
2. The optical fiber temperature measurement system based on the fluorescence characteristics of the erbium-doped optical fiber as claimed in claim 1, wherein: the port A (14) is an input optical channel, the port B (15) is a bidirectional full-waveband optical channel, and the port C (16) is an output optical channel.
3. The optical fiber temperature measurement system based on the fluorescence characteristics of the erbium-doped optical fiber as claimed in claim 1, wherein: the optical power meter A (7) is a silicon-based optical power meter, and the optical power meter B (8) is an InGaAsP optical power meter.
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| CN202021202717.1U CN212844061U (en) | 2020-06-24 | 2020-06-24 | Optical fiber temperature measurement system based on fluorescence characteristics of erbium-doped optical fiber |
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| CN202021202717.1U CN212844061U (en) | 2020-06-24 | 2020-06-24 | Optical fiber temperature measurement system based on fluorescence characteristics of erbium-doped optical fiber |
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