CN216207030U - Optical signal measuring system based on reference light automatic compensation - Google Patents
Optical signal measuring system based on reference light automatic compensation Download PDFInfo
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- CN216207030U CN216207030U CN202122715441.8U CN202122715441U CN216207030U CN 216207030 U CN216207030 U CN 216207030U CN 202122715441 U CN202122715441 U CN 202122715441U CN 216207030 U CN216207030 U CN 216207030U
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Abstract
The utility model provides an optical signal measuring system based on reference light automatic compensation, which is realized by the following technical scheme: the light source provides a measurement optical signal and a reference optical signal which are homologous, the measurement optical signal is attenuated after passing through a measurement medium, and a measurement voltage signal is obtained after passing through a photoelectric conversion circuit, a signal amplification circuit and a filter circuit; the reference optical signal directly passes through the same photoelectric conversion circuit, the signal amplification circuit and the filter circuit to obtain a reference voltage signal; the measured voltage signal and the reference voltage signal are used for obtaining a voltage signal which can be finally collected by the AD converter through the differential comparison circuit, and the CPU reads the AD collected signal through the data bus and can calculate the measured light intensity. When the light source fluctuates, the same measuring light and reference light fluctuate simultaneously, and measuring errors caused by power supply fluctuation are eliminated through the differential comparison circuit. The utility model aims to provide an optical signal measuring method which is high in stability and is not influenced by fluctuation of a light source.
Description
Technical Field
The utility model belongs to the technical field of optical signal measurement, and particularly relates to an optical signal measurement system based on reference light automatic compensation.
Background
The optical fiber has the advantages of good insulation property, explosion resistance, corrosion resistance, strong anti-interference capability and easiness in miniaturization, and the attenuation degree of optical signals transmitted in the optical fiber is inconsistent in air and fuel oil. The fixed light source emits measuring light through the optical fiber, and the measured light intensity of the optical fiber is attenuated after the optical fiber passes through fuel oil. When the oil immersion height changes, the linear change of the light intensity attenuation degree is measured, the corresponding fuel oil height can be calculated by measuring the light intensity in the optical fiber, and the rapid development is obtained in the aviation fuel oil measurement field by the optical signal measurement of the optical fiber based on the above characteristics of the optical fiber.
At present, the optical signal measuring method for measuring aviation fuel oil adopts a light source to directly send out a measuring optical signal through an optical fiber, and acquires the intensity of the optical signal in the optical fiber to calculate the height of the fuel oil. Because the electromagnetic environment on the machine is complex and changeable, the light source is easy to fluctuate, and when the light source fluctuates, the measured light intensity is changed. In the actual measurement process, it is difficult to judge whether the current change of the light intensity is caused by normal attenuation caused by the light propagation medium or light source fluctuation, so that the measurement error is extremely large in the actual measurement process.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects and the requirements of the prior art, the utility model provides an optical signal measuring system based on reference light automatic compensation, which comprises a light source, a measuring optical signal unit, a reference optical signal unit, a measuring channel, a reference channel, a differential comparison circuit, a data acquisition unit and a data processing unit; the light source provides homologous measurement light signals and reference light signals, when the light source fluctuates, the homologous measurement light and the reference light fluctuate simultaneously, and measurement errors caused by power supply fluctuation are eliminated through the differential comparison circuit. Thereby achieving more stable and accurate measurement.
The specific implementation content of the utility model is as follows:
the utility model provides an optical signal measuring system based on reference light automatic compensation, which comprises a light source, a measuring optical signal unit, a reference optical signal unit, a measuring channel, a reference channel, a differential comparison circuit, a data acquisition unit and a data processing unit, wherein the measuring optical signal unit is used for measuring the reference optical signal unit;
the light source is respectively connected with the measuring optical signal unit and the reference optical signal unit, respectively correspondingly connected with the measuring channel and the reference channel through the measuring optical signal unit and the reference optical signal unit, and then connected with the differential comparison circuit through the measuring channel and the reference channel; a signal attenuation unit is arranged in the measurement channel;
the differential comparison circuit, the data acquisition unit and the data processing unit are connected in sequence.
In order to better implement the present invention, further, the measurement channel and the reference channel both include a photoelectric conversion unit, a signal amplification unit, and a filter circuit;
the input end of a signal attenuation unit in the measuring channel is connected with a measuring optical signal unit, and the output end of the signal attenuation unit is sequentially connected with a photoelectric conversion unit, a signal amplification unit and a filter circuit of the measuring channel and is connected with the differential comparison circuit through the filter circuit;
the input end of the photoelectric conversion unit in the reference channel is connected with the reference light signal unit, and the output end of the photoelectric conversion unit is sequentially connected with the signal amplification unit and the filter circuit of the reference channel and is connected with the differential comparison circuit through the filter circuit.
In order to better implement the present invention, further, the filter circuit employs an RC filter circuit.
In order to better implement the present invention, further, the data acquisition unit employs an AD conversion circuit.
In order to better implement the present invention, further, the data processing unit employs a CPU processing chip.
In order to better implement the present invention, further, the signal attenuation unit employs a measuring medium, and performs signal attenuation on the measuring optical signal through the measuring medium.
The utility model has the following advantages and beneficial effects:
according to the utility model, a light source provides a measurement optical signal and a reference optical signal which are homologous, the measurement optical signal is attenuated after passing through a measurement medium, and then a measurement voltage signal is obtained after passing through a photoelectric conversion circuit, a signal amplification circuit and a filter circuit; the reference optical signal directly passes through the same photoelectric conversion circuit, the signal amplification circuit and the filter circuit to obtain a reference voltage signal; the measured voltage signal and the reference voltage signal are used for obtaining a voltage signal which can be finally collected by the AD converter through the differential comparison circuit, and the CPU reads the AD collected signal through the data bus and can calculate the measured light intensity. When the light source fluctuates, the same measuring light and reference light fluctuate simultaneously, and the measuring error caused by power fluctuation is eliminated through the differential comparison circuit, so that the more accurate and stable measuring effect is achieved.
Drawings
FIG. 1 is a schematic diagram of the connection of modules embodying the present invention;
fig. 2 is a schematic circuit diagram of the differential comparator circuit of the present invention.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and therefore should not be considered as a limitation to the scope of protection. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "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; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
the embodiment provides an optical signal measuring system based on reference light automatic compensation, as shown in fig. 1, including a light source, a measuring optical signal unit, a reference optical signal unit, a measuring channel, a reference channel, a differential comparison circuit, a data acquisition unit, and a data processing unit;
the light source is respectively connected with the measuring optical signal unit and the reference optical signal unit, respectively correspondingly connected with the measuring channel and the reference channel through the measuring optical signal unit and the reference optical signal unit, and then connected with the differential comparison circuit through the measuring channel and the reference channel; a signal attenuation unit is arranged in the measurement channel;
the differential comparison circuit, the data acquisition unit and the data processing unit are connected in sequence.
The working principle is as follows: the light source provides homologous measurement light signals and reference light signals, when the light source fluctuates, the homologous measurement light and the reference light fluctuate simultaneously, and measurement errors caused by power supply fluctuation are eliminated through the differential comparison circuit. Thereby achieving more stable and accurate measurement.
Example 2:
in this embodiment, on the basis of embodiment 1 above, in order to better implement the present invention, further, the measurement channel and the reference channel both include a photoelectric conversion unit, a signal amplification unit, and a filter circuit;
the input end of a signal attenuation unit in the measuring channel is connected with a measuring optical signal unit, and the output end of the signal attenuation unit is sequentially connected with a photoelectric conversion unit, a signal amplification unit and a filter circuit of the measuring channel and is connected with the differential comparison circuit through the filter circuit;
the input end of the photoelectric conversion unit in the reference channel is connected with the reference light signal unit, and the output end of the photoelectric conversion unit is sequentially connected with the signal amplification unit and the filter circuit of the reference channel and is connected with the differential comparison circuit through the filter circuit.
The working principle is as follows: as shown in fig. 1: the light source provides a measurement optical signal and a reference optical signal which are homologous, the measurement optical signal is attenuated after passing through a measurement medium, and a measurement voltage signal is obtained after passing through a photoelectric conversion circuit, a signal amplification circuit and a filter circuit; the reference optical signal directly passes through the same photoelectric conversion circuit, the signal amplification circuit and the filter circuit to obtain a reference voltage signal; the measured voltage signal and the reference voltage signal are used for obtaining a voltage signal which can be finally collected by the AD converter through the differential comparison circuit, and the CPU reads the AD collected signal through the data bus and can calculate the measured light intensity. When the light source fluctuates, the same measuring light and reference light fluctuate simultaneously, and measuring errors caused by power supply fluctuation are eliminated through the differential comparison circuit. The photoelectric conversion circuit can be formed by a photodiode and converts an optical signal into a current signal, and the signal amplification circuit can be formed by an operational amplifier and converts a circuit signal into a voltage signal.
Other parts of this embodiment are the same as those of embodiment 1, and thus are not described again.
Example 3:
in this embodiment, on the basis of any of the above embodiments 1-2, the differential comparison circuit shown in fig. 2 uses the amplifier FX620 for the low power consumption meter, the voltage gain of which can be changed only by one external resistor, and the amplifier is configured in such a way that a fixed resistor and a potentiometer are connected in parallel, and the range of the output voltage, i.e., the signal collected by the AD converter, can be adjusted by changing the resistance value of the amplifier resistor.
Other parts of this embodiment are the same as any of embodiments 1-2 described above, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (6)
1. An optical signal measuring system based on reference light automatic compensation is characterized by comprising a light source, a measuring optical signal unit, a reference optical signal unit, a measuring channel, a reference channel, a differential comparison circuit, a data acquisition unit and a data processing unit;
the light source is respectively connected with the measuring optical signal unit and the reference optical signal unit, respectively correspondingly connected with the measuring channel and the reference channel through the measuring optical signal unit and the reference optical signal unit, and then connected with the differential comparison circuit through the measuring channel and the reference channel; a signal attenuation unit is arranged in the measurement channel;
the differential comparison circuit, the data acquisition unit and the data processing unit are connected in sequence.
2. The optical signal measuring system based on the automatic compensation of the reference light as claimed in claim 1, wherein the measuring channel and the reference channel both comprise a photoelectric conversion unit, a signal amplifying unit and a filter circuit;
the input end of a signal attenuation unit in the measuring channel is connected with a measuring optical signal unit, and the output end of the signal attenuation unit is sequentially connected with a photoelectric conversion unit, a signal amplification unit and a filter circuit of the measuring channel and is connected with the differential comparison circuit through the filter circuit;
the input end of the photoelectric conversion unit in the reference channel is connected with the reference light signal unit, and the output end of the photoelectric conversion unit is sequentially connected with the signal amplification unit and the filter circuit of the reference channel and is connected with the differential comparison circuit through the filter circuit.
3. The optical signal measuring system based on the automatic compensation of the reference light as claimed in claim 2, wherein the filter circuit employs an RC filter circuit.
4. An optical signal measuring system based on automatic compensation of reference light as claimed in claim 1, 2 or 3, characterized in that the data acquisition unit employs an AD conversion circuit.
5. The optical signal measuring system based on the automatic compensation of the reference light as claimed in claim 1, 2 or 3, wherein the data processing unit employs a CPU processing chip.
6. The optical signal measuring system based on the automatic compensation of the reference light as claimed in claim 1, 2 or 3, wherein the signal attenuation unit employs a measuring medium, and performs signal attenuation on the measuring optical signal through the measuring medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122715441.8U CN216207030U (en) | 2021-11-08 | 2021-11-08 | Optical signal measuring system based on reference light automatic compensation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122715441.8U CN216207030U (en) | 2021-11-08 | 2021-11-08 | Optical signal measuring system based on reference light automatic compensation |
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| Publication Number | Publication Date |
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| CN216207030U true CN216207030U (en) | 2022-04-05 |
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| CN202122715441.8U Active CN216207030U (en) | 2021-11-08 | 2021-11-08 | Optical signal measuring system based on reference light automatic compensation |
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2021
- 2021-11-08 CN CN202122715441.8U patent/CN216207030U/en active Active
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