CN110823141B - Demodulator and demodulation method of reflection type coaxial cable Fabry-Perot sensor - Google Patents
Demodulator and demodulation method of reflection type coaxial cable Fabry-Perot sensor Download PDFInfo
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- CN110823141B CN110823141B CN201911094864.3A CN201911094864A CN110823141B CN 110823141 B CN110823141 B CN 110823141B CN 201911094864 A CN201911094864 A CN 201911094864A CN 110823141 B CN110823141 B CN 110823141B
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
- G01B15/06—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring the deformation in a solid
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Abstract
The invention discloses a demodulator of a reflection-type coaxial cable Fabry-Perot sensor, which comprises a VCO circuit, a power divider, a first coupler, a second coupler, a wave detector, a first port, a second port and a sensor, wherein the VCO circuit is connected with the power divider, the power divider is respectively connected with the first coupler and the second coupler, the first coupler and the second coupler are respectively connected with the sensor through the first port and the second port, and the first coupler and the second coupler are also respectively connected with the wave detector. Through the mode, the demodulator and the demodulation method of the reflective coaxial cable Fabry-Perot sensor provided by the invention have the advantages that the state of the sensor is dynamically monitored in real time, the dynamic frequency offset is obtained through cyclic scanning, the deformation quantity is calculated according to the frequency offset, the precision is high, the error is small, and the environment adaptability is strong.
Description
Technical Field
The invention relates to the technical field of strain monitoring, in particular to a demodulator and a demodulation method of a reflection type coaxial cable Fabry-Perot sensor.
Background
The coaxial cable strain sensor is a sensor, and can be applied to the scenes of strain monitoring, such as pipeline deformation monitoring, bridge deformation monitoring, rail deformation monitoring and the like. The demodulator demodulates the coaxial cable strain sensor, so that the demodulator can be applied to a plurality of fields of strain monitoring.
At present, no special regulator and other equipment for demodulating the coaxial cable strain sensor exist in the market, and a vector network analyzer is needed when the coaxial cable strain sensor is demodulated in the prior art. The vector network analyzer is an indispensable measurement scale for product function and performance tests especially in production tests. However, the vector network analyzer is a general electromagnetic wave energy testing device, cannot be applied to practical engineering, has strong limitation on the use environment, is complex in demodulation method, low in measurement accuracy, and is difficult to meet the modern high-accuracy requirement.
Disclosure of Invention
The invention mainly solves the technical problem of providing a demodulator of a reflection-type coaxial cable Fabry-Perot sensor, dynamically monitors the state of the sensor in real time, obtains dynamic frequency offset by means of cyclic scanning, calculates deformation according to the frequency offset, and has the advantages of high precision, small error and strong environment adaptability.
In order to solve the technical problems, the invention adopts a technical scheme that: there is provided a demodulator of a reflective coaxial cable fabry-perot sensor, comprising a VCO circuit, a power divider, a first coupler, a second coupler, a detector, a first port, a second port and a sensor, the VCO circuit is connected with a power divider, the power divider is respectively connected with a first coupler and a second coupler, the first coupler is connected with the first port, the second coupler is connected with the second port, the first port and the second port are respectively connected with the sensor, the first coupler is connected with one detector, the second coupler is connected with the other detector, the VCO circuit generates microwave radio frequency signals, the microwave radio frequency signals are subjected to power amplification through the amplifier and are subjected to shunting processing through power division, then the radio frequency signal is transmitted in a directional way through the coupler, and finally the radio frequency signal reflected back by the sensor returns to the detector through the coupler to detect the power amplitude.
In a preferred embodiment of the present invention, the demodulator further includes an amplifier, and the VCO circuit is connected to the power divider through the amplifier.
In a preferred embodiment of the present invention, the VCO circuit emits a microwave rf signal.
In a preferred embodiment of the present invention, a coaxial cable Fabry-Perot sensor is monitored by using a strong reflection and weak transmission method.
In order to solve the technical problem, the invention adopts another technical scheme that: the demodulation method of the reflection type coaxial cable Fabry-Perot sensor comprises the following specific steps:
a. initialization
The method comprises the following steps of MCU initialization, VCO initialization and external ADC initialization;
b. data snooping
Performing data monitoring and analysis on the serial port and allocating a task tag to a data analysis instruction;
c. task execution
And executing tasks according to the task tags, wherein the tasks comprise communication instruction analysis, data transmission, data processing and data acquisition.
The invention has the beneficial effects that: the demodulator agent adjusting method of the reflective coaxial cable Fabry-Perot sensor dynamically monitors the state of the sensor in real time, obtains dynamic frequency offset through circulating scanning, calculates the deformation amount according to the frequency offset, and has high precision, small error and strong environment adaptability.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a block diagram of the demodulator of the reflective coaxial cable Fabry-Perot sensor of the present invention;
fig. 2 is a flow chart of a demodulation method of the reflective coaxial cable fabry-perot sensor of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention includes:
a demodulator of a reflection-type coaxial cable Fabry-Perot sensor comprises a VCO circuit, a power divider, a first coupler, a second coupler, a detector, a first port, a second port and a sensor, wherein the VCO circuit is connected with the power divider, the power divider is respectively connected with the first coupler and the second coupler, the first coupler and the second coupler are respectively connected with the sensor through the first port and the second port, and the first coupler and the second coupler are respectively connected with the detector.
In the above, the VCO circuit sends out a microwave rf signal; the sensor adopts a weak reflection and strong transmission mode to monitor the coaxial cable Fabry-Perot sensor.
Furthermore, the demodulator also comprises an amplifier, and the VCO circuit is connected with the power divider through the amplifier.
The working principle is as follows: the VCO circuit generates microwave radio frequency signals, the microwave radio frequency signals are subjected to power amplification through an amplifier, are subjected to shunting processing through power division, are subjected to directional transmission through a coupler, and finally, the radio frequency signals reflected by the sensor return to a detector through the coupler to detect the power amplitude.
Firstly, scanning amplitude-frequency characteristics and searching a peak point with the highest amplitude; selecting a section of data from the amplitude values to perform fitting to obtain a fitting peak point; and obtaining dynamic frequency offset by cyclic scanning, and finally calculating the deformation according to the frequency offset.
As shown in fig. 2, the present invention further provides a demodulation method of a reflective coaxial cable fabry sensor, which comprises the following specific steps:
a. initialization
Including MCU initialization, VCO initialization, and external ADC initialization.
The MCU initialization mainly comprises the steps of setting the input and output states of pins of the MCU, the enablement and parameter setting of serial port interruption, the enablement of a timer and the parameter setting of the timer;
vco initialization is mainly to enable the Vco chip and set Vco initial register parameters;
the external ADC initialization mainly comprises enabling an ADC chip and setting SPI bus parameters.
b. Data snooping
And performing data monitoring and analysis on the serial port to distribute a task tag.
And (3) monitoring process:
when the serial port interruption is triggered, the serial port cache receives data ceaselessly, the serial port data receiving pointer is updated at the same time, when the serial port data receiving pointer is not updated any more, or the serial port data exceeds the set maximum receiving length, the data cached by the serial port is analyzed, an instruction is judged according to the content of a communication protocol, and meanwhile, a task tag is updated according to formulated distribution.
c. Task execution
And executing tasks according to the task tags, wherein the tasks comprise communication instruction analysis, data transmission, data processing and data acquisition.
And (3) task execution:
and when the task tag is updated, judging which task is output by the task tag, and processing the task at the moment, wherein the task comprises a data acquisition task, a data processing task and a data transmission task. And after the task is processed for one time, the task label is cleared to wait for the next update of the task label.
Wherein,
and (3) instruction analysis:
analyzing the instruction content according to the communication protocol, wherein the content comprises sensor parameter configuration, demodulator scanning configuration and demodulator frequency sweeping parameter configuration,
each protocol has a corresponding digital unique identifier (control command byte) to determine the instruction content of the protocol according to the byte.
Data transmission:
and transmitting the required data to the upper computer through the serial port according to the data transmission instruction.
Data acquisition:
and acquiring data in real time according to the task label, the sensor configuration parameter, the demodulator frequency sweep parameter and the demodulator scanning parameter.
Data processing:
the data processing comprises ADC acquisition filtering and a data fitting algorithm.
Meanwhile, the acquired data are subjected to median filtering algorithm processing in the data processing process, and after the processed data are integrated, data fitting is carried out to obtain the minimum value of the data, and the minimum value is used as final data to be stored.
In conclusion, the demodulator agent adjusting method of the reflective coaxial cable Fabry-Perot sensor dynamically monitors the state of the sensor in real time, obtains dynamic frequency offset through circulation scanning, calculates the deformation amount according to the frequency offset, and has high precision, small error and strong environment adaptability.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (5)
1. A demodulator of a reflection-type coaxial cable Fabry-Perot sensor is characterized by comprising a VCO circuit, a power divider, a first coupler, a second coupler, a detector, a first port, a second port and a sensor, wherein the VCO circuit is connected with the power divider, the power divider is respectively connected with the first coupler and the second coupler, the first coupler is connected with the first port, the second coupler is connected with the second port, the first port and the second port are respectively connected with the sensor, the first coupler is connected with one detector, the second coupler is connected with the other detector, a microwave radio-frequency signal generated by the VCO circuit is subjected to power amplification through an amplifier, is subjected to shunting processing through the power divider, is subjected to directional transmission through the first coupler and the second coupler respectively, and finally is subjected to radio-frequency signal reflected by the sensor and passes through the first coupler, the second coupler and the first coupler, The second coupler returns to the detector to detect the power amplitude; firstly, scanning amplitude-frequency characteristics and searching a peak point with the highest amplitude; selecting a section of data from the amplitude values to perform fitting to obtain a fitting peak point; and obtaining dynamic frequency offset by cycle scanning, and finally calculating the deformation amount according to the frequency offset.
2. The reflective coaxial cable fabry-perot sensor demodulator of claim 1, further comprising an amplifier, wherein the VCO circuit is connected to the power divider through the amplifier.
3. The reflective coaxial cable fabry-perot sensor demodulator of claim 1, wherein the VCO circuit emits a microwave rf signal.
4. The reflective coaxial cable fabry-perot sensor demodulator of claim 1, wherein the coaxial cable fabry-perot sensor is monitored by a strong reflective weak transmissive mode.
5. A method for demodulating a reflective coaxial cable Fabry-Perot sensor according to any one of claims 1-4, comprising the following steps:
a. initialization
The method comprises the following steps of MCU initialization, VCO initialization and external ADC initialization;
b. data snooping
Performing data monitoring and analysis on the serial port and allocating a task tag to a data analysis instruction;
c. task execution
And executing tasks according to the task tags, wherein the tasks comprise communication instruction analysis, data transmission, data processing and data acquisition.
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