CN114383641A - Optical sensing demodulation module and optical sensing system - Google Patents
Optical sensing demodulation module and optical sensing system Download PDFInfo
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- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
Abstract
The application provides a light sensing demodulation module and a light sensing system, wherein the light sensing demodulation module comprises a shell, a power control module, a light emitting module, a backlight detection module, a light splitting module, a signal control module, a first detection module and a second detection module; the shell is provided with a first optical fiber interface, a second optical fiber interface, a first electrical interface and a second electrical interface; the power control module is connected with the first electrical interface; the light-emitting module is arranged in the shell and connected with the power control module; the backlight detection module is arranged in the shell and connected with the light-emitting module and the power control module; the light splitting module is arranged in the shell and connected with the light emitting module and the first optical fiber interface; the signal control module is arranged in the shell and is connected with the second electrical interface; the first detection module is arranged in the shell and connected with the light splitting module and the signal control module; the second detection module is arranged in the shell and connected with the second optical fiber interface and the signal control module. Effectively removes the signal baseline generated by the power fluctuation of the light source in the sensing signal.
Description
Technical Field
The present disclosure relates to optical sensing technologies, and in particular, to an optical sensing demodulation module and an optical sensing system.
Background
An intensity modulation type optical fiber sensor is a sensor which converts the state of a physical parameter to be measured into a measurable optical signal. The working principle of the intensity modulation type optical fiber sensor is that light beams emitted by a laser are sent to a modulator through an optical fiber, the light intensity of optical signals is changed into modulated optical signals in the modulator, the modulated optical signals are sent to a demodulation module through the optical fiber after modulation processing, and the measured value of a physical parameter to be measured is obtained through the demodulation module.
In practice, lasers typically suffer from a decrease in output optical power due to temperature changes or aging. In order to maintain the optical power during sensing constant, a feedback type automatic power control circuit is generally used in the laser driving circuit, and the laser is power compensated by the feedback type automatic power control circuit.
However, when the power of the laser is compensated by using the feedback type power control circuit, the power of the laser fluctuates back and forth within a small range. The fluctuation is not critical to the optical communication industry, but for optical sensing which mainly uses analog signal modulation, the fluctuation of the laser power can generate a fluctuating baseline in the final sensing signal, and the existence of the baseline can make it difficult to judge whether the fluctuation of the sensing signal is caused by the modulation of an external test parameter on the optical sensor or the change of the laser power in the process of analyzing the sensing signal, so that the influence of the small-range change of the optical power can be eliminated only by increasing the modulation judgment threshold of the optical sensor. At this time, sensor signal changes caused by changes of external parameters with small modulation amplitudes cannot be detected, so that the precision of the demodulation module is reduced.
In the prior art, the base line of the sensing signal is removed by fitting the sensing signal through upper computer software, but the method needs a large amount of calculation, fitting calculation is carried out on the basis of stored data, and the base line cannot be removed in real time. Meanwhile, the weak change of the laser power may cause a large error to be generated when the upper computer software performs baseline fitting.
Disclosure of Invention
An object of the embodiments of the present application is to provide an optical sensing demodulation module and an optical sensing system, which improve the accuracy of the demodulation module.
On one hand, the application provides an optical sensing demodulation module, which comprises a shell, a power control module, a light emitting module, a backlight detection module and a light splitting module; the shell is provided with a first optical fiber interface, a second optical fiber interface, a first electrical interface and a second electrical interface; the power control module is arranged in the shell and is connected with the first electrical interface; the light-emitting module is arranged in the shell and connected with the power control module, and is used for receiving the electric signal sent by the power control module, converting the electric signal into an optical signal and sending the optical signal; the optical signals comprise front optical signals and backlight signals; the backlight detection module is arranged in the shell, connected with the light-emitting module and the power control module, and used for receiving a backlight signal sent by the light-emitting module, converting the backlight signal into backlight current and sending the backlight current to the power control module so that the power control module controls the power of the light-emitting module according to the backlight current; the light splitting module is arranged in the shell, connected with the light emitting module and the first optical fiber interface and used for receiving a front optical signal sent by the light emitting module, splitting the front optical signal into a first optical signal and a second optical signal and sending the first optical signal to the first optical fiber interface.
The light sensing demodulation module further comprises: the device comprises a signal control module, a first detection module and a second detection module; the signal control module is arranged in the shell and is connected with the second electrical interface; the first detection module is arranged in the shell, connected with the light splitting module and the signal control module and used for receiving a second optical signal sent by the light splitting module, converting the second optical signal into a second electric signal and sending the second electric signal to the signal control module; the second detection module is arranged in the shell, connected with the second optical fiber interface and the signal control module and used for receiving the first optical signal passing through the second optical fiber interface, converting the first optical signal into a first electric signal and sending the first electric signal to the signal control module; wherein the second electrical signal is used to calibrate the first electrical signal.
In one embodiment, the power control module includes a voltage regulator component and a control component; the voltage stabilizing element is connected with the first electrical interface and used for receiving voltage passing through the first electrical interface, eliminating voltage fluctuation, stabilizing the voltage within a set range and sending a sending light current; the control element is connected with the voltage stabilizing element, the light emitting module and the backlight detection module and is used for receiving the light emitting current sent by the voltage stabilizing element and the backlight current sent by the backlight detection module;
the control element controls the power of the light emitting module according to the backlight current by:
when the backlight current is not reduced, the control element sends the light-emitting current to the light-emitting module;
when the backlight current is monitored to be reduced, the control element generates bias current and sends the bias current and the light-emitting current to the light-emitting module.
In one embodiment, the signal control module comprises a conversion element and an amplification element; the conversion element is connected with the first detection module and the second detection module, and is used for receiving the first electric signal and the second electric signal and converting the first electric signal and the second electric signal into a first voltage signal and a second voltage signal; the amplifying element is connected with the conversion element and the second electrical interface, and the amplifying element is used for receiving the first voltage signal and the second voltage signal sent by the conversion element, amplifying the first voltage signal and the second voltage signal and then sending the amplified first voltage signal and the amplified second voltage signal to the second electrical interface.
In an embodiment, the light emitting module comprises a narrow band laser and the light splitting module comprises an optical splitter.
In an embodiment, the first detection module, the second detection module and the backlight detection module are PIN photodiodes.
In an embodiment, the first detecting module, the second detecting module and the backlight detecting module are avalanche diodes.
In one embodiment, the housing includes a first surface and a second surface, the first optical fiber interface and the second optical fiber interface are disposed on the first surface, and the first electrical interface and the second electrical interface are disposed on the second surface; the first surface and the second surface are oppositely arranged on the shell.
On the other hand, the application also provides an optical sensing system which comprises an intensity modulation type optical fiber sensor, power supply equipment, data acquisition equipment and an upper computer besides the optical sensing demodulation module; the intensity modulation type optical fiber sensor is connected with the first optical fiber interface and the second optical fiber interface, and is used for receiving a first optical signal passing through the first optical fiber interface, modulating the first optical signal according to the physical quantity to be measured, and sending the modulated first optical signal to the second optical fiber interface after modulation; the power supply equipment is connected with the optical sensing demodulation module through the first electrical interface and the second electrical interface and used for providing power for the optical sensing demodulation module; the data acquisition equipment is connected with the optical sensing demodulation module through a second electrical interface and is used for receiving a first voltage signal and a second voltage signal which pass through the second electrical interface; the upper computer is connected with the data acquisition equipment and is used for receiving a first voltage signal and a second voltage signal sent by the data acquisition equipment.
In an embodiment, the upper computer is further configured to perform a calibration operation on the first voltage signal according to the second voltage signal, and obtain a measurement result of the physical quantity to be measured according to the first voltage signal after the calibration operation.
In one embodiment, the power supply device and the data acquisition device are integrally connected with the light sensing demodulation module.
Compared with the prior art, the beneficial effect of this application is:
in the scheme of the application, based on the light sensing demodulation equipment integrating receiving and transmitting, the influence of a signal baseline generated by light source intensity fluctuation on the sensing precision is reduced by adopting a method of simultaneously acquiring reference signals. Specifically, the optical sensing demodulation module in the application can acquire the sensing signal and the reference signal at the same time, and the reference signal is used for calibrating the sensing signal, so that a signal baseline generated by the fluctuation of the power of the light source in the sensing signal is eliminated. Meanwhile, compared with a method for removing the signal baseline through upper computer software fitting, the method has the advantages that the calculation amount of the upper computer is greatly reduced, and the baseline can be removed in real time. In summary, the present application greatly improves the accuracy of the demodulation module, and further, greatly improves the measurement accuracy of the intensity modulation type optical fiber sensor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a light sensing demodulation module according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a light sensing system according to an embodiment of the present application;
FIG. 3 is a diagram illustrating a first voltage signal before calibration according to an embodiment of the present disclosure;
FIG. 4 is a diagram illustrating a calibrated first voltage signal according to an embodiment of the present disclosure;
FIG. 5 is a schematic structural diagram of a light sensing system according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a light sensing system according to an embodiment of the present application.
Reference numerals:
100-intensity modulated optical fiber sensor; 200-light sensing demodulation module; 210-a housing; 211-a first fiber optic interface; 212-a second fiber optic interface; 213-a first electrical interface; 214-a second electrical interface; 215-a first surface; 216-a second surface; 220-a light splitting module; 230-a light emitting module; 240-backlight detection module; 250-a power control module; 251-a control element; 252-a voltage stabilizing element; 260-a first detection module; 270-a second detection module; 280-a signal control module; 281-a conversion element; 282-an amplifying element; 300-a power supply device; 400-a data acquisition device; 500-an upper computer; 600-an optical fiber; 1000-light sensing system.
Detailed Description
The terms "first," "second," "third," and the like are used for descriptive purposes only and not for purposes of indicating or implying relative importance, and do not denote any order or order.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when products of the application are used, and are used only for convenience in describing the application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application.
In the description of the present application, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.
The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings.
Please refer to fig. 1, which is a schematic structural diagram of an optical sensing demodulation module according to an embodiment of the present application. A light sensing demodulation module 200 includes a housing 210, a light emitting portion, and a light receiving portion. The housing 210 has a first optical fiber interface 211, a second optical fiber interface 212, a first electrical interface 213 and a second electrical interface.
The light emitting portion includes a light splitting module 220, a light emitting module 230, a backlight detecting module 240, and a power control module 250.
The light splitting module 220, the light emitting module 230, the backlight detecting module 240 and the power control module 250 are all disposed in the housing 210; the power control module 250 is connected to the first electrical interface 213; the light emitting module 230 is connected to the power control module 250, and the light emitting module 230 is configured to receive an electrical signal sent by the power control module 250, convert the electrical signal into an optical signal, and send the optical signal; the optical signals comprise front optical signals and backlight signals, and the electric signals are current signals; the backlight detection module 240 is connected to the light emitting module 230 and the power control module 250, and the backlight detection module 240 is configured to receive a backlight signal sent by the light emitting module 230, convert the backlight signal into a backlight current, and send the backlight current to the power control module 250, so that the power control module 250 controls the power of the light emitting module 230 according to the backlight current; the optical splitting module 220 is connected to the light emitting module 230 and the first optical fiber interface 211, and the optical splitting module 220 is configured to receive a front optical signal sent by the light emitting module 230, split the front optical signal into a first optical signal and a second optical signal, and send the first optical signal to the first optical fiber interface 211.
In one embodiment, the first optical signal and the second optical signal are equal in power.
In another embodiment, the first optical signal and the second optical signal are not equal in power.
The light receiving portion includes a first detection module 260, a second detection module 270, and a signal control module 280.
The first detection module 260, the second detection module 270 and the signal control module 280 are all disposed in the housing 210; the signal control module 280 is connected to the second electrical interface 214; the first detection module 260 is connected to the light splitting module 220 and the signal control module 280, and the first detection module 260 is configured to receive a second optical signal sent by the light splitting module 220, convert the second optical signal into a second electrical signal, and send the second electrical signal to the signal control module 280; the second detection module 270 is connected to the second optical fiber interface 212 and the signal control module 280, and the second detection module 270 is configured to receive the first optical signal through the second optical fiber interface 212, convert the first optical signal into a first electrical signal, and send the first electrical signal to the signal control module 280; the second electrical signal is used for calibrating the first electrical signal, and the first electrical signal and the second electrical signal are both current signals.
In one embodiment, the light emitting module 230 includes a narrow band laser. The narrowband laser may be a narrowband laser module or chip.
In one embodiment, the first detection module 260, the second detection module 270 and the backlight detection module 240 are PIN-type photodiodes.
In another embodiment, the first detection module 260, the second detection module 270, and the backlight detection module 240 are Avalanche Photo Diodes (APDs).
In one embodiment, the housing 210 includes a first surface 215 and a second surface 216; the first surface 215 and the second surface 216 are oppositely arranged on the shell 210; the first optical fiber interface 211 and the second optical fiber interface 212 are disposed on the first surface 215, and the first electrical interface 213 and the second electrical interface 214 are disposed on the second surface 216.
Fig. 2 is a schematic structural diagram of an optical sensing system according to an embodiment of the present application. As shown in fig. 2, the power control module 250 includes a control element 251 and a voltage regulator element 252. The voltage stabilizing element 252 is connected to the first electrical interface 213, and the voltage stabilizing element 252 is configured to receive the voltage through the first electrical interface 213, eliminate voltage fluctuation in the voltage, stabilize the voltage within a set range, and send a light emitting current to the control element; the control element 251 is connected to the voltage stabilizing element 252, the light emitting module 230 and the backlight detecting module 240, and the control element 251 is configured to receive the light emitting current sent by the voltage stabilizing element 252 and the backlight current sent by the backlight detecting module 240.
As shown in fig. 2, the signal control module 280 includes a conversion element 281 and an amplification element 282. The conversion element 281 is connected to the first detection module 260 and the second detection module 270, and the conversion element 281 is configured to receive the first electrical signal and the second electrical signal, convert the first electrical signal into a first voltage signal, and convert the second electrical signal into a second voltage signal; the amplifying element 282 is connected to the converting element 281 and the second electrical interface 214, and the amplifying element 282 is configured to receive the first voltage signal and the second voltage signal sent by the converting element 281, amplify the first voltage signal and the second voltage signal, and send the amplified first voltage signal and the amplified second voltage signal to the second electrical interface 214.
As shown in fig. 2, the present application provides an optical sensing system 1000, where the optical sensing system 1000 includes an intensity modulation type optical fiber sensor 100, an optical sensing demodulation module 200, a power supply device 300, a data acquisition device 400, and an upper computer 500.
The intensity modulation type optical fiber sensor 100 is connected with the first optical fiber interface 211 and the second optical fiber interface 212 through an optical fiber 600, the intensity modulation type optical fiber sensor 100 is used for receiving an optical signal passing through the first optical fiber interface 211, modulating the first optical signal according to a physical quantity to be measured, and transmitting the modulated first optical signal to the second optical fiber interface 212 after modulation; the power supply device 300 is connected to the optical sensing demodulation module 200 through the first electrical interface 213 and the second electrical interface 214, and the power supply device 300 is configured to provide power to the optical sensing demodulation module 200; wherein the power supply device 300 is a voltage source, and the power supply device 300 provides power for the light emitting part and the light receiving part, so that the light sensing demodulation module 200 can operate normally; the data acquisition device 400 is connected to the light sensing demodulation module 200 through the second electrical interface 214, and is configured to receive the first voltage signal and the second voltage signal through the second electrical interface 214; the upper computer 500 is connected with the data acquisition equipment 400, and the upper computer 500 is used for receiving a first voltage signal and a second voltage signal sent by the data acquisition equipment 400.
In an embodiment, the power supply device 300 and the data acquisition device 400 are integrally connected to the light sensing demodulation module 200.
In an operation process, the power supply apparatus 300 outputs a voltage to the voltage regulator device 252 through the first electrical interface 213. The voltage stabilizing element 252 may eliminate voltage fluctuation in the voltage after receiving the voltage, so that the voltage is stabilized within a set range, and send the light emitting current to the control element 251 after the voltage is eliminated. The control element 251 may transmit the light emitting current to the light emitting module 230 after receiving the light emitting current transmitted by the voltage stabilizing element 252. After receiving the light emitting current, the light emitting module 230 may convert the light emitting current into a front light signal and a backlight signal, and send the front light signal to the light splitting module 220. Meanwhile, the light emitting module 230 may transmit the backlight signal to the backlight detecting module 240.
The backlight detection module 240 may convert the backlight signal into a backlight current after receiving the backlight signal, and send the backlight current to the control element 251 after the backlight signal is successfully converted. After receiving the backlight current, the control component 251 may perform power compensation on the light emitting module 230 according to the backlight current. Specifically, when it is monitored that the backlight current is not reduced, the control element 251 sends the light emitting current to the light emitting module; when the backlight current is monitored to be decreased, the control element 251 generates a bias current and transmits the bias current and the light emitting current to the light emitting module 230.
After receiving the front optical signal, the optical splitting module 220 may split the front optical signal into a first optical signal and a second optical signal, send the first optical signal to the first optical fiber interface 211, and send the second optical signal to the first detection module 260.
The intensity modulation type optical fiber sensor 100 may perform modulation processing on the first optical signal according to the physical quantity to be measured after receiving the first optical signal through the first optical fiber interface 211, and transmit the modulated first optical signal to the second optical fiber interface 212 after the modulation processing. The second detection module 270 may receive the modulated first optical signal through the second optical fiber interface 212, convert the first optical signal into a first electrical signal, and send the first electrical signal to the conversion element 281 after the conversion is successful. After receiving the second optical signal, the first detection module 260 may convert the second optical signal into a second electrical signal, and send the second electrical signal to the conversion element 281 after the conversion is successful.
The conversion element 281 receives the first electrical signal and the second electrical signal, converts the first electrical signal into a first voltage signal, converts the second electrical signal into a second voltage signal, and sends the first voltage signal and the second voltage signal to the amplification element 282 after the conversion is successful. The amplifying element 282 may amplify the first voltage signal and the second voltage signal after receiving the first voltage signal and the second voltage signal, and transmit the amplified first voltage signal and the amplified second voltage signal to the second electrical interface 214. The data acquisition device 400 may receive the first voltage signal and the second voltage signal through the second electrical interface 214, and send the first voltage signal and the second voltage signal to the upper computer 500 after the first voltage signal and the second voltage signal are successfully received. After receiving the first voltage signal and the second voltage signal, the upper computer 500 may perform calibration operation on the first voltage signal according to the second voltage signal, and obtain a measurement result of the physical quantity to be measured according to the first voltage signal after the calibration operation.
In an embodiment, when the first optical signal and the second optical signal have the same power, the upper computer 500 may subtract the second voltage signal from the first voltage signal after receiving the first voltage signal and the second voltage signal, so as to calibrate the first voltage signal.
In an embodiment, when the power of the first optical signal is different from that of the second optical signal, the upper computer 500 converts the first voltage signal and the second voltage signal after receiving the first voltage signal and the second voltage signal, and subtracts the second voltage signal from the converted first voltage signal after the conversion is finished, so as to calibrate the first voltage signal.
In another embodiment, when the first optical signal and the second optical signal have the same power, the upper computer 500 may divide the first voltage signal by the second voltage signal after receiving the first voltage signal and the second voltage signal, so as to calibrate the first voltage signal.
In an embodiment, when the power of the first optical signal is different from that of the second optical signal, the upper computer 500 converts the first voltage signal and the second voltage signal after receiving the first voltage signal and the second voltage signal, and divides the converted first voltage signal by the second voltage signal after the conversion is finished, so as to calibrate the first voltage signal.
Fig. 3 is a schematic diagram of a first voltage signal before calibration according to an embodiment of the present application. As shown in fig. 3, the solid line in the figure represents the acquisition result of the first voltage signal, and the broken line in the figure represents the acquisition result of the second voltage signal. The first voltage signal is a sensing signal, and the second voltage signal is a reference signal. The first voltage signal has an insertion loss in the intensity modulation type optical fiber sensor 100 such that the minimum value of the second voltage signal is larger than the maximum value of the first voltage signal. As shown in fig. 3, the insertion loss of the first voltage signal in this application is about 1 dB. The first voltage signal has a part with the same change trend as the second voltage signal, and the first voltage signal is a periodic signal.
Fig. 4 is a schematic diagram of a calibrated first voltage signal according to an embodiment of the present application.
As can be seen from fig. 3 and 4, the reference signal can effectively characterize the variation trend of the baseline in the sensing signal, i.e. the variation trend of the reference signal is the same as that of the baseline in the sensing signal. Meanwhile, after the first sensing signal is calibrated by the second sensing signal, the baseline in the sensing signal is effectively removed, and the measurement accuracy of the intensity modulation type optical fiber sensor 100 is greatly improved.
In the present application, after the power control element 251 performs power compensation on the light emitting module 230 according to the backlight current, the light emitting power of the light emitting module 230 fluctuates back and forth within a small range, so that a baseline problem exists in the sensing signal. In order to solve the problems, the sensing signals and the reference signals are acquired simultaneously in the application, and the reference signals are used for calibrating the sensing signals, so that the baseline problem existing in the optical sensing signals is effectively eliminated, and the measurement precision of the optical fiber sensor is greatly improved. Meanwhile, compared with a method for removing the signal baseline through upper computer software fitting, the method has the advantages that the calculation amount of the upper computer is greatly reduced, and the baseline can be removed in real time.
Fig. 5 is a schematic structural diagram of an optical sensing system according to an embodiment of the present application. As shown in fig. 5, compared to the light sensing system 1000 shown in fig. 2, the present embodiment does not have the first detection module 260, and connects the backlight detection module 240 with the conversion element 281. The present embodiment is different from the light sensing system 1000 shown in fig. 2 in that the backlight detection module 240 sends the backlight current to the conversion element 281, and the backlight current is taken as the second electrical signal.
Fig. 6 is a schematic structural diagram of an optical sensing system according to an embodiment of the present application. As shown in fig. 6, compared to the light sensing system 1000 shown in fig. 2, the first detecting module 260 does not exist in the present embodiment, and the control element 251 is connected to the converting element 281. The present embodiment is different from the light sensing system 1000 shown in fig. 2 in that the control element 251 sends a bias current into the conversion element 281, and the bias current is taken as the second electrical signal.
By the measures, the change trend of the backlight current and the bias current is the same as the change trend of the baseline in the sensing signal, so that the baseline in the sensing signal can be removed by collecting the backlight current or the bias current.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. An optical sensor demodulation module, comprising:
a housing; the shell is provided with a first optical fiber interface, a second optical fiber interface, a first electrical interface and a second electrical interface;
the power control module is arranged in the shell and is connected with the first electrical interface;
the light-emitting module is arranged in the shell and connected with the power control module, and is used for receiving the electric signal sent by the power control module, converting the electric signal into an optical signal and sending the optical signal; the optical signal comprises a front optical signal and a backlight signal;
the backlight detection module is arranged in the shell and connected with the light-emitting module and the power control module, and is used for receiving a backlight signal sent by the light-emitting module, converting the backlight signal into a backlight current and sending the backlight current to the power control module so that the power control module controls the power of the light-emitting module according to the backlight current;
the light splitting module is arranged in the shell and connected with the light emitting module and the first optical fiber interface, and is used for receiving a front optical signal sent by the light emitting module, splitting the front optical signal into a first optical signal and a second optical signal and sending the first optical signal to the first optical fiber interface;
the signal control module is arranged in the shell and is connected with the second electrical interface;
the first detection module is arranged in the shell and connected with the light splitting module and the signal control module, and the first detection module is used for receiving a second optical signal sent by the light splitting module, converting the second optical signal into a second electric signal and sending the second electric signal to the signal control module;
the second detection module is arranged in the shell and connected with the second optical fiber interface and the signal control module, and the second detection module is used for receiving the first optical signal passing through the second optical fiber interface, converting the first optical signal into a first electric signal and sending the first electric signal to the signal control module; wherein the second electrical signal is used to calibrate the first electrical signal.
2. The light-sensing demodulation module of claim 1, wherein the power control module comprises:
the voltage stabilizing element is connected with the first electrical interface and used for receiving the voltage passing through the first electrical interface, eliminating the fluctuation of the voltage, stabilizing the voltage within a set range and sending a sending current;
the control element is connected with the voltage stabilizing element, the light emitting module and the backlight detection module and is used for receiving the light emitting current sent by the voltage stabilizing element and the backlight current sent by the backlight detection module;
the control element controls the power of the light emitting module according to the backlight current by:
when the backlight current is monitored not to be reduced, the control element sends the light-emitting current to the light-emitting module;
when the backlight current is monitored to be reduced, the control element generates a bias current and sends the bias current and the light-emitting current to the light-emitting module.
3. The light-sensing demodulation module of claim 1, wherein the signal control module comprises:
the conversion element is connected with the first detection module and the second detection module, and is used for receiving the first electric signal and the second electric signal and converting the first electric signal and the second electric signal into a first voltage signal and a second voltage signal;
the amplifying element is connected with the conversion element and the second electrical interface, and is used for receiving the first voltage signal and the second voltage signal sent by the conversion element, amplifying the first voltage signal and the second voltage signal and sending the amplified first voltage signal and the amplified second voltage signal to the second electrical interface.
4. The light sensing demodulation module of claim 1, wherein the light emitting module comprises a narrow band laser and the optical splitting module comprises an optical splitter.
5. The light sensor demodulation module of claim 1, wherein the first detection module, the second detection module and the backlight detection module are PIN photodiodes.
6. The light-sensing demodulation module of claim 1 wherein said first detection module, said second detection module and said backlight detection module are avalanche diodes.
7. The optical sensor demodulation module of claim 1, wherein the housing comprises a first surface and a second surface, the first optical fiber interface and the second optical fiber interface are disposed on the first surface, and the first electrical interface and the second electrical interface are disposed on the second surface; wherein, the first surface and the second surface are arranged on the shell oppositely.
8. An optical sensing system comprising, in addition to the optical sensing demodulation module of any one of claims 1-6:
the intensity modulation type optical fiber sensor is connected with the first optical fiber interface and the second optical fiber interface, and is used for receiving a first optical signal passing through the first optical fiber interface, modulating the first optical signal according to a physical quantity to be measured, and transmitting the modulated first optical signal to the second optical fiber interface after modulation;
the power supply equipment is connected with the optical sensing demodulation module through a first electrical interface and a second electrical interface and is used for providing a power supply for the optical sensing demodulation module;
the data acquisition equipment is connected with the optical sensing demodulation module through the second electrical interface and is used for receiving a first voltage signal and a second voltage signal which pass through the second electrical interface;
and the upper computer is connected with the data acquisition equipment and is used for receiving the first voltage signal and the second voltage signal sent by the data acquisition equipment.
9. The optical sensing system according to claim 8, wherein the upper computer is further configured to perform a calibration operation on the first voltage signal according to the second voltage signal, and obtain a measurement result of the physical quantity to be measured according to the first voltage signal after the calibration operation.
10. The optical sensing system of claim 8, wherein the power supply device and the data acquisition device are integrally connected to the optical sensing demodulation module.
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