CN212621180U - Temperature measuring device for optical fiber composite phase line - Google Patents
Temperature measuring device for optical fiber composite phase line Download PDFInfo
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- CN212621180U CN212621180U CN202021514804.0U CN202021514804U CN212621180U CN 212621180 U CN212621180 U CN 212621180U CN 202021514804 U CN202021514804 U CN 202021514804U CN 212621180 U CN212621180 U CN 212621180U
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Abstract
A temperature measuring device for an optical fiber composite phase line belongs to the field of power supply conductor state detection. The optical add-drop multiplexer comprises a controller, a pulse laser module, an optical add-drop multiplexer, a photoelectric converter and an analog-to-digital converter; the pulse laser module comprises a pulse generator and a pulse laser, wherein the pulse generator is used for emitting rectangular excitation pulses, the central wavelength of the pulse laser is 1550nm, and the peak power is 8-13W; the rectangular excitation pulse is also used for triggering the controller to interrupt timing; the photoelectric converter comprises at least two groups of optical filters and avalanche photodiodes; the output end of the analog-to-digital converter is correspondingly and electrically connected with the GPIO pin of the controller. The temperature detection precision of the optical fiber composite phase line is high.
Description
Technical Field
The utility model relates to a power supply wire state detects technical field, concretely relates to temperature measuring device for optical fiber composite phase line.
Background
An optical phase conductor (OPPC) includes a power supply conductor and an optical fiber, which is commonly used as an optical communication medium. When power is supplied, the current causes heating of the power supply lead, and the heating seriously causes unrecoverable influence on the service life of the power supply lead and the service life of the optical fiber. Generally, by analyzing the heating point of the power supply lead, the method is also beneficial to timely sending out the line fault and positioning the fault point area. In addition, on a power supply line adopting the electric heating ice melting technology, the power of the ice melting device can be corrected in time by monitoring the temperature of the power supply lead, and secondary damage is avoided.
Patent document CN103115693A describes a distributed optical fiber raman temperature measurement system, which includes a pulse laser, a wavelength division multiplexer, a sensing optical fiber, a dual-channel avalanche photodiode and a DSP digital signal processor; the pulse laser emits pulse laser, the pulse laser enters the sensing optical fiber to be detected after passing through the wavelength division multiplexer, the pulse laser continuously generates back scattering in the transmission process in the optical fiber, the back scattering light returns to the wavelength division multiplexer, and after being filtered by the wavelength division multiplexer, the Stokes Raman scattering light and the anti-Stokes Raman scattering light are respectively filtered out and enter the two-channel avalanche photodiode for photoelectric conversion; the system also comprises a temperature signal obtained by processing the electric signal output by the double-channel avalanche photodiode through the DSP. The technical scheme mainly relates to a distributed optical fiber temperature measurement method, but relevant factors of an optical fiber Raman temperature measurement system comprise the types of optical fibers, laser wavelengths, Stokes Raman scattering light and anti-Stokes Raman scattering light, and noise optimization.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a temperature measuring device for optical fiber composite phase line to solve the technical problem that the precision is low when current distributed optical fiber Raman temperature measurement system uses the temperature detection at optical fiber composite phase line.
The technical scheme of the utility model is that:
a temperature measuring device for an optical fiber composite phase line comprises a controller, a pulse laser module, an optical add-drop multiplexer, a photoelectric converter and an analog-to-digital converter;
the pulse laser module comprises a pulse generator and a pulse laser, the pulse generator is used for emitting rectangular excitation pulses, the pulse laser is excited by the rectangular excitation pulses and then emits measuring beams for emitting into the temperature measuring optical fiber, the central wavelength of the pulse laser is 1550nm, and the peak power of the pulse laser is 8W-13W; the rectangular excitation pulse is also used for triggering the controller to interrupt timing;
the optical add-drop multiplexer is used for passing the measuring light beam and enabling the measuring light beam to be emitted into the temperature measuring optical fiber, and enabling stokes Raman scattered light and anti-stokes Raman scattered light to be led out in a bypass mode;
the photoelectric converters comprise optical filters, avalanche photodiodes, and the photoelectric converters have at least two groups, wherein one group of photoelectric converters is configured as a first group of photoelectric converters for converting the stokes raman scattered light into a first electrical signal, and the other group of photoelectric converters is configured as a second group of photoelectric converters for converting the anti-stokes raman scattered light into a second electrical signal;
the output end of the analog-to-digital converter is electrically connected with the GPIO pin of the controller correspondingly and used for respectively performing analog-to-digital conversion on the first electric signal and the second electric signal.
Preferably, the filter is a thin film interference filter.
Preferably, the photoelectric converter further includes a multistage amplification filter circuit including a plurality of negative feedback amplification units connected in series.
Preferably, the photoelectric converter further comprises a temperature compensation circuit, the temperature compensation circuit comprises a temperature sensor and a voltage-adjustable bias power supply, the temperature sensor is used for detecting the temperature of the avalanche photodiode, and the voltage-adjustable bias power supply is loaded on the P of the avalanche photodiode+And (4) a pole.
The utility model has the advantages that:
1. the utility model discloses in the temperature measuring device working process for the fiber-optic compound phase line, pulse excitation pulse laser ware that pulse generator arouses sends measuring beam, and measuring beam forms stokes raman scattering light, anti-stokes raman scattering light through the light insertion multiplexer in the temperature measurement optic fibre, stokes raman scattering light, anti-stokes raman scattering light retroreflection are read back input controller by first group photoelectric converter, the second group photoelectric converter respectively behind the light insertion multiplexer. Wherein the rectangular excitation pulse contributes to the light intensity concentration of the measuring beam emitted by the pulse laser; the peak power of the pulse laser is associated with the photodiode, and when the peak power of the pulse laser is 7W-15W, the photodiode should be selected as an avalanche photodiode, because the performance of the avalanche photodiode is related to the power of the measuring beam, and when the peak power is 7W-15W, the signal to noise ratio of the measuring device can be reduced. The excitation pulse triggers the controller to interrupt timing and the measurement of the Turkes Raman scattering light and the anti-Stokes Raman scattering light are used together to realize the measurement of the temperature and the corresponding position of the extended length section of the measuring optical fiber.
2. The temperature compensation circuit can keep the gain of the avalanche photodiode unchanged by adjusting the bias voltage of the avalanche photodiode to change in proportion to the change of the ambient temperature, but the key of the method is accurate temperature measurement.
Drawings
Fig. 1 is a power supply circuit diagram of the temperature measuring device for an optical fiber composite phase line according to the present invention.
Fig. 2 is a circuit diagram of a controller of the temperature measuring device for an optical fiber composite phase line according to the present invention.
Fig. 3 is a circuit diagram of the photoelectric converter and the analog-to-digital converter of the temperature measuring apparatus for an optical fiber composite phase line according to the present invention.
Detailed Description
The present invention is described below in terms of embodiments with reference to the accompanying drawings to assist those skilled in the art in understanding and realizing the invention. Unless otherwise indicated, the following embodiments and technical terms therein should not be understood to depart from the background of the technical knowledge in the technical field.
Example 1: a temperature measuring device for an optical fiber composite phase line comprises a controller, a pulse laser module, an optical add-drop multiplexer, a photoelectric converter and an analog-to-digital converter.
Wherein, the pulse laser module includes pulse generator and pulse laser. For pulsed lasers, pulsing the power supply of the pulsed laser can achieve the lowest current deviation of the laser and help stabilize the laser diode stability of the laser. The pulse generator is used for emitting rectangular excitation pulses. The pulse laser emits a measuring beam for emitting into the temperature measuring optical fiber after being excited by the rectangular excitation pulse, the central wavelength of the pulse laser is 1550nm, and the peak power is 7W-15W. The rectangular excitation pulse contributes to the light intensity concentration of the measuring beam emitted by the pulse laser; the peak power of the pulse laser is associated with the photodiode, and the photodiode should be selected as an avalanche photodiode when the peak power of the pulse laser is 8W-13W, because the performance of the avalanche photodiode is related to the power of the measuring beam, and when the peak power is 8W-13W, the signal-to-noise ratio of the measuring device can be reduced. The rectangular excitation pulse is also used to trigger the controller to interrupt timing. Referring to fig. 2, the rectangular excitation pulse is electrically connected with the interrupt pin 33 of the STM32F103RT type single chip microcomputer.
The optical add-drop multiplexer is used for passing a measuring light beam and enabling the measuring light beam to be emitted into the temperature measuring optical fiber, the measuring light beam is excited by temperature in the temperature measuring optical fiber to form Stokes Raman scattering light and anti-Stokes Raman scattering light, and the Stokes Raman scattering light and the anti-Stokes Raman scattering light return to be transmitted backwards, so that the Stokes Raman scattering light and the anti-Stokes Raman scattering light can be led out from a bypass by the optical add-drop multiplexer. Anti-stokes raman scattered light is more sensitive to temperature changes than stokes raman scattered light.
When the sensing distance is short, such as less than 40m, the anti-Stokes light returned by the tail end of the sensing optical fiber is strongest when the laser is near the wavelength of 840 nm; when the sensing distance is in the range of 400m-2200m, the optimal working wavelength of the laser is near 1320nm, and the single-mode optical fiber is superior to the multimode optical fiber; for sensing systems with longer sensing distances, the operating wavelength of l550nm is superior, and single mode fibers are also more effective than multimode fibers.
Wherein the photoelectric converters comprise optical filters, avalanche photodiodes, and the photoelectric converters have at least two groups, wherein one group of photoelectric converters is configured as a first group of photoelectric converters for converting stokes raman scattered light into a first electrical signal, and the other group of photoelectric converters is configured as a second group of photoelectric converters for converting anti-stokes raman scattered light into a second electrical signal. The filter is preferably a thin film interference filter. The filters of the first group of photoelectric converters are distinguished from the filters of the second group of photoelectric converters such that only stokes raman scattered light is able to pass through the filters of the first group of photoelectric converters and only anti-stokes raman scattered light is able to pass through the filters of the second group of photoelectric converters.
The output end of the analog-to-digital converter is electrically connected with the GPIO pin of the controller correspondingly and used for respectively performing analog-to-digital conversion on the first electric signal and the second electric signal.
Fig. 1 shows a power supply circuit, in which ME7660 is a voltage inverter. The voltage VFF is a reverse voltage of the voltage VEE. The voltage AVDD is 3.3V direct current.
When in use, the controller counts time t when receiving the rectangular excitation pulse0. The controller receives the first electric signal and the second electric signal and times t1。
The power of the backward anti-stokes Brillouin scattering light received by the photoelectric converter is close to nW magnitude. That is, the backward anti-stokes brillouin scattered light detected by the photoelectric converter is completely buried in noise, and therefore, in order to extract the signal light from the noise, in addition to the improvement of the detection sensitivity of the photodetector as much as possible, effective signal processing measures must be taken. Therefore, in the present embodiment, the photoelectric converter further includes a multistage amplification filter circuit including a plurality of negative feedback amplification units connected in series.
The temperature variation affects the working state of the high-speed data acquisition circuit and can also cause unstable system operation. After the avalanche photodiode converts the optical signal into an electrical signal, a high-speed analog-to-digital converter is required to convert the analog signal into a digital signal and process the digital signal by a computer. The digital signal obtained by the computer processing is then subjected to digital-to-analog conversion for further processing and control. The performance of the analog-to-digital converter is also affected by temperature, which, even if small, can cause a reduction in the spatial and temperature resolution of the sensor.
For the avalanche photodiode, a temperature compensation circuit for biasing the avalanche photodiode needs to be designed, and the gain of the avalanche photodiode can be kept unchanged by adjusting the bias voltage of the avalanche photodiode to change in proportion to the change of the ambient temperature, but the key of the method is accurate temperature measurement. Preferably, the photoelectric converter further comprises a temperature compensation circuit, the temperature compensation circuit comprises a temperature sensor and a voltage-adjustable bias power supply, the temperature sensor is used for detecting the temperature of the avalanche photodiode, and the voltage-adjustable bias power supply is loaded on the P of the avalanche photodiode+And (4) a pole. Referring to fig. 3, the temperature sensor is selected from PT1000 type temperature sensors. The voltage-adjustable bias power supply is provided by a DAC (digital-to-analog converter) functional pin 20 and a pin 21 of an STM32F103RT type singlechip.
The present invention has been described in detail with reference to the accompanying drawings and examples. It should be understood that this description is not exhaustive of all possible embodiments, and that the inventive concepts are presented herein by way of illustration to the extent possible. Without departing from the inventive concept of the present invention and without paying creative labor, the technical features of the above embodiments are combined, the specific parameters are changed by experiment, or the prior art in the technical field is used to carry out the specific implementation manner of conventional replacement formation by the disclosed technical means, which all belong to the content hidden in the present invention.
Claims (4)
1. A temperature measuring device for an optical fiber composite phase line comprises a controller, a pulse laser module, an optical add-drop multiplexer, a photoelectric converter and an analog-to-digital converter; the method is characterized in that:
the pulse laser module comprises a pulse generator and a pulse laser, the pulse generator is used for emitting rectangular excitation pulses, the pulse laser is excited by the rectangular excitation pulses and then emits measuring beams for emitting into the temperature measuring optical fiber, the central wavelength of the pulse laser is 1550nm, and the peak power of the pulse laser is 8W-13W; the rectangular excitation pulse is also used for triggering the controller to interrupt timing;
the optical add-drop multiplexer is used for passing the measuring light beam and enabling the measuring light beam to be emitted into the temperature measuring optical fiber, and enabling stokes Raman scattered light and anti-stokes Raman scattered light to be led out in a bypass mode;
the photoelectric converters comprise optical filters, avalanche photodiodes, and the photoelectric converters have at least two groups, wherein one group of photoelectric converters is configured as a first group of photoelectric converters for converting the stokes raman scattered light into a first electrical signal, and the other group of photoelectric converters is configured as a second group of photoelectric converters for converting the anti-stokes raman scattered light into a second electrical signal;
the output end of the analog-to-digital converter is electrically connected with the GPIO pin of the controller correspondingly and used for respectively performing analog-to-digital conversion on the first electric signal and the second electric signal.
2. The temperature measurement device for the fiber optic composite phase line of claim 1, wherein the filter is a selective thin film interference filter.
3. The temperature-measuring apparatus for an optical phase conductor according to claim 1, wherein the photoelectric converter further comprises a multistage amplification filter circuit including a plurality of negative feedback amplification units connected in series.
4. The temperature-measurement device for the fiber optic composite phase line of claim 1, wherein the photoelectric converter further comprises a temperature-compensation circuit, the temperature-compensation circuit comprising a temperature sensor for detecting the temperature of the avalanche photodiode and a voltage-adjustable bias power supply loaded at the P of the avalanche photodiode+And (4) a pole.
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| CN202021514804.0U CN212621180U (en) | 2020-07-28 | 2020-07-28 | Temperature measuring device for optical fiber composite phase line |
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| CN202021514804.0U CN212621180U (en) | 2020-07-28 | 2020-07-28 | Temperature measuring device for optical fiber composite phase line |
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