CN114383641B - Optical sensing demodulation module and optical sensing system - Google Patents
Optical sensing demodulation module and optical sensing system Download PDFInfo
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- CN114383641B CN114383641B CN202210048753.4A CN202210048753A CN114383641B CN 114383641 B CN114383641 B CN 114383641B CN 202210048753 A CN202210048753 A CN 202210048753A CN 114383641 B CN114383641 B CN 114383641B
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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
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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 is connected with the power control module; the backlight detection module is arranged in the shell and is 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 connected with the second electrical interface; the first detection module is arranged in the shell and is 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. And a signal baseline generated by the fluctuation of the power of the light source in the sensing signal is effectively removed.
Description
Technical Field
The application relates to the technical field of optical sensing, in particular to an optical sensing demodulation module and an optical sensing system.
Background
An intensity modulated fiber optic sensor is a sensor that converts the state of a measured physical parameter into a measurable optical signal. The working principle of the intensity modulation type optical fiber sensor is that a light beam emitted by a laser is sent into a modulator through an optical fiber, the light intensity of an optical signal is changed into a modulated optical signal in the modulator, the modulated optical signal is sent into a demodulation module through the optical fiber after modulation, and a measured value of a physical parameter to be measured is obtained through the demodulation module.
In practice, the laser will typically cause a decrease in the output optical power due to temperature changes or aging. In order to maintain the optical power constant during sensing, a feedback-type automatic power control circuit is generally used in the laser driving circuit, and the feedback-type automatic power control circuit is used to compensate the power of the laser.
However, the use of a feedback type power control circuit to compensate the power of the laser can lead to a small fluctuation of the power of the laser. Such fluctuations are not critical to the optical communications industry, but for optical sensing, which is mainly modulated by analog signals, fluctuations in laser power can cause a baseline of fluctuations in the final sensing signal, and the presence of the baseline can make it difficult to determine whether the fluctuations in the sensing signal originate from the modulation of the optical sensor by external test parameters or the variation of the laser power during the analysis of the sensing signal, so that the modulation determination threshold of the optical sensor can only be increased to eliminate the effect of small-range variation of the optical power. At this time, sensor signal changes caused by some external parameter changes with smaller modulation amplitude cannot be detected, resulting in reduced accuracy of the demodulation module.
In the prior art, the sensing signals are fitted through the upper computer software, so that the baseline of the sensing signals is removed, but the method requires larger calculation amount, and the method performs fitting calculation based on the stored data, so that the baseline cannot be removed in real time. Meanwhile, weak power variation of the laser can cause larger errors in baseline fitting of upper computer software.
Disclosure of Invention
An object of the embodiment of the application is to provide an optical sensing demodulation module and an optical sensing system, which improve the accuracy of the demodulation module.
In one aspect, 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 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 the 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, is connected with the light emitting module and the first optical fiber interface, and is used for receiving the front light signal sent by the light emitting module, dividing the front light signal into a first light signal and a second light signal and sending the first light signal to the first optical fiber interface.
The optical sensing demodulation module further comprises: the system 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, is connected with the light splitting module and the signal control module, and is used for receiving the 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, is connected with the second optical fiber interface and the signal control module, and 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 transmitting the first electric signal to the signal control module; the second electric signal is used for calibrating the first electric signal.
In one embodiment, the power control module includes a voltage stabilizing element and a control element; the voltage stabilizing element is connected with the first electrical interface, and is 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 transmitting a 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 luminous current to the luminous 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.
In one embodiment, the signal control module includes a conversion element and an amplifying 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 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 second voltage signal to the second electrical interface.
In one embodiment, the light emitting module comprises a narrow band laser and the light splitting module comprises an optical splitter.
In one embodiment, the first detection module, the second detection module and the backlight detection module are PIN photodiodes.
In one embodiment, the first detection module, the second detection module, and the backlight detection 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 the optical sensing demodulation module, an intensity modulation type optical fiber sensor, a power supply device, a data acquisition device and an upper computer; 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 transmitting the modulated first optical signal to the second optical fiber interface after the modulation; the power supply equipment is connected with the optical sensing demodulation module through the first electrical interface and the second electrical interface and is 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 through the second electrical interface; 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.
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 an embodiment, the power supply device and the data acquisition device are integrally connected with the optical sensing demodulation module.
Compared with the prior art, the beneficial effects of this application are:
in the scheme, the light sensing demodulation equipment based on the integrated receiving and transmitting is used for reducing the influence of a signal base line generated by light source intensity fluctuation on sensing precision by adopting a method for simultaneously acquiring reference signals. Specifically, the optical sensing demodulation module in the application can collect the sensing signal and the reference signal at the same time, calibrate the sensing signal by using the reference signal, and eliminate a signal baseline generated by the fluctuation of the power of the light source in the sensing signal. Meanwhile, compared with a method for removing the signal base line through upper computer software fitting, the method has the advantages that the calculated amount of an upper computer is greatly reduced, and the base line can be removed in real time. In summary, the accuracy of the demodulation module is greatly improved, and further, the measurement accuracy of the intensity modulation type optical fiber sensor is greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an optical sensing demodulation module according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a photo-sensor system according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a first voltage signal before calibration according to an embodiment of the present application;
FIG. 4 is a diagram of a calibrated first voltage signal according to an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a photo-sensor system according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a photo-sensing system according to an embodiment of the present application.
Reference numerals:
100-intensity modulated fiber optic sensor; 200-an optical sensing demodulation module; 210-a housing; 211-a first fiber 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-a backlight detection module; 250-a power control module; 251-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-amplifying element; 300-a power supply device; 400-data acquisition equipment; 500-an upper computer; 600-optical fiber; 1000-photo-sensing system.
Detailed Description
The terms "first," "second," "third," and the like are used merely for distinguishing between descriptions and not for indicating a sequence number, nor are they to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its 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, directions or positional relationships indicated by terms such as "inner", "outer", "left", "right", "upper", "lower", etc. are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use for the product of the application, are merely for convenience of description and simplification of the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present application.
In the description of the present application, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements.
The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an optical sensing demodulation module according to an embodiment of the disclosure. The optical sensing demodulation module 200 includes a housing 210, a light emitting portion, and a light receiving portion. The housing 210 is provided with 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 part 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 with 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 a front optical signal and a backlight signal, 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 the front light signal sent by the light emitting module 230, split the front light 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 one other embodiment, the first optical signal and the second optical signal are not equal in power.
The light receiving part 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 with 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 the 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 passing 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 electric signal is used for calibrating the first electric signal, and the first electric signal and the second electric 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 photodiodes.
In one other embodiment, the first detection module 260, the second detection module 270, and the backlight detection module 240 are Avalanche Photodiodes (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 disposed opposite to each other on the housing 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 a photo-sensor system according to an embodiment of the disclosure. As shown in fig. 2, the power control module 250 includes a control element 251 and a voltage stabilizing element 252. The voltage stabilizing element 252 is connected with the first electrical interface 213, and the voltage stabilizing element 252 is used for receiving the voltage passing through the first electrical interface 213, eliminating voltage fluctuation in the voltage, stabilizing the voltage within a set range and sending a luminous 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 detection 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 detection module 240.
As shown in fig. 2, the signal control module 280 includes a conversion element 281 and an amplifying 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 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-modulated optical fiber sensor 100, an optical sensing demodulation module 200, a power supply device 300, a data acquisition device 400, and a host 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 the optical fiber 600, and 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 the modulation; the power supply device 300 is connected with 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 used for providing power for the optical sensing demodulation module 200; 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 normally operate; the data acquisition device 400 is connected with the optical 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 to the data acquisition device 400, and the upper computer 500 is configured to receive the first voltage signal and the second voltage signal sent by the data acquisition device 400.
In one embodiment, the power supply apparatus 300 and the data acquisition apparatus 400 are integrally connected with the optical sensing demodulation module 200.
In an operation process, the power supply apparatus 300 outputs a voltage to the voltage stabilizing device 252 through the first electrical interface 213. After receiving the voltage, the voltage stabilizing element 252 can eliminate voltage fluctuation in the voltage, so that the voltage is stabilized within a set range, and after the elimination, the light-emitting current is sent to the control element 251. After receiving the light-emitting current sent by the voltage stabilizing element 252, the control element 251 may send the light-emitting current to the light-emitting module 230. After receiving the light emitting current, the light emitting module 230 can 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.
After receiving the backlight signal, the backlight detection module 240 may convert the backlight signal into a backlight current, and send the backlight current to the control element 251 after the conversion is successful. After receiving the backlight current, the control element 251 can 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 reduced, the control element 251 generates a bias current and sends the bias current and the light emitting current to the light emitting module 230.
After the optical splitting module 220 receives the front optical signal, the front optical signal may be split into a first optical signal and a second optical signal, where the first optical signal is sent to the first optical fiber interface 211, and the second optical signal is sent to the first detection module 260.
The intensity-modulated 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 passing through the first optical fiber interface 211, and may 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 after the conversion is successful, send the second electrical signal to the conversion element 281.
After receiving the first electrical signal and the second electrical signal, the conversion element 281 can convert the first electrical signal into a first voltage signal, convert the second electrical signal into a second voltage signal, and send the first voltage signal and the second voltage signal to the amplifying element 282 after the conversion is successful. After receiving the first voltage signal and the second voltage signal, the amplifying element 282 may amplify the first voltage signal and the second voltage signal, and send the first voltage signal and the second voltage signal to the second electrical interface 214 after the amplifying process. 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 received successfully. 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 power of the first optical signal is the same as that of the second optical signal, 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 other embodiments, when the power of the first optical signal is the same as that of the second optical signal, 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 result of acquisition of the first voltage signal, and the broken line in the figure represents the result of acquisition 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-modulated fiber optic sensor 100 such that the minimum value of the second voltage signal is greater than the maximum value of the first voltage signal. As shown in fig. 3, the insertion loss of the first voltage signal in the present application is about 1dB. The first voltage signal has the same part with the change trend of 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 fig. 4, the reference signal can effectively represent the change trend of the baseline in the sensing signal, that is, the change trend of the reference signal is the same as the change trend of the baseline in the sensing signal. Meanwhile, after the second sensing signal is adopted to calibrate the first sensing signal, a base line 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 signal and the reference signal are collected simultaneously, the reference signal is used for calibrating the sensing signal, the baseline problem existing in the optical sensing signal is effectively removed, and the measuring precision of the optical fiber sensor is greatly improved. Meanwhile, compared with a method for removing the signal base line through upper computer software fitting, the method has the advantages that the calculated amount of an upper computer is greatly reduced, and the base line can be removed in real time.
Fig. 5 is a schematic structural diagram of a photo-sensor system according to an embodiment of the disclosure. As shown in fig. 5, in comparison with the light sensing system 1000 shown in fig. 2, the first detection module 260 is not present, and the backlight detection module 240 is connected to the conversion element 281. The difference between the present embodiment and the optical sensing system 1000 shown in fig. 2 is that the backlight detection module 240 sends the backlight current to the conversion element 281, and the backlight current is used as the second electrical signal.
Fig. 6 is a schematic structural diagram of a photo-sensor system according to an embodiment of the disclosure. As shown in fig. 6, in comparison with the optical sensing system 1000 shown in fig. 2, the first detection module 260 is absent, and the control element 251 is connected to the conversion element 281. The present embodiment differs from the optical sensing system 1000 shown in fig. 2 in that the control element 251 transmits a bias current to the conversion element 281 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 base line in the sensing signal, so that the base line in the sensing signal can be removed by collecting the backlight current or the bias current.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. An optical sensing 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; wherein 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 backlight signals sent by the light-emitting module, converting the backlight signals 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 and connected with the light emitting module and the first optical fiber interface, and is used for receiving a front light signal sent by the light emitting module, dividing the front light signal into a first light signal and a second light signal and sending the first light 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 is used for receiving the 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 is used for receiving a 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 optical sensing demodulation module of claim 1 wherein the power control module comprises:
the voltage stabilizing element is connected with the first electrical interface and is 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 transmitting a 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 a bias current and sends the bias current and the light-emitting current to the light-emitting module.
3. The optical 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 then sending the amplified first voltage signal and the amplified second voltage signal to the second electrical interface.
4. The optical sensing demodulation module of claim 1 wherein the light emitting module comprises a narrow band laser and the light splitting module comprises an optical splitter.
5. The light sensing 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 the first detection module, the second detection module, and the backlight detection module are avalanche diodes.
7. The optical sensing demodulation module according to 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; the first surface and the second surface are oppositely arranged on the shell.
8. A light sensing system comprising, in addition to the light sensing demodulation module of any one of claims 1-6, a light sensing module comprising:
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 the 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 power 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 through the second electrical interface;
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 the 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 with the optical sensing demodulation module.
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