CN113008492B - Long-distance multi-parameter synchronous detection system for bridge - Google Patents
Long-distance multi-parameter synchronous detection system for bridge Download PDFInfo
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- CN113008492B CN113008492B CN202110219114.5A CN202110219114A CN113008492B CN 113008492 B CN113008492 B CN 113008492B CN 202110219114 A CN202110219114 A CN 202110219114A CN 113008492 B CN113008492 B CN 113008492B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0008—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of bridges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
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Abstract
The invention relates to the field of elasticity test of structural components, in particular to a long-distance multi-parameter synchronous detection system for a bridge, which comprises an analysis module, a modulation module and an optical fiber sensing module, wherein the analysis module sends optical signals to the modulation module, the modulation module modulates the optical signals into detection signals according to frequencies which are arranged in different sequences respectively, the modulation module sends the detection signals to the optical fiber sensing module, the optical fiber sensing module respectively transmits the detection signals and synchronously senses the change information of the bridge, the change information comprises vibration change, temperature change and stress change, the optical fiber sensing module sends echo signals reflected by the detection signals to the analysis module, and the analysis module receives the echo signals for analysis; the analysis module analyzes the stress value, vibration intensity and temperature value of the bridge from the echo signals and stores and displays the stress value, vibration intensity and temperature value. The method and the device can improve timeliness of detecting parameter changes at different positions of the bridge, have stronger contrast of a plurality of data and improve the referenceability of the data.
Description
Technical Field
The invention relates to the field of elasticity test of structural components, in particular to a long-distance multi-parameter synchronous detection system for a bridge.
Background
In order to adapt to the traffic industry of modern high-speed development, the bridge becomes an important building which is erected across mountain, poor geology or meets other traffic requirements and is more convenient to pass, so that in the vehicle passing process of the bridge, various technical parameters of the bridge need to be detected to judge or predict the using condition of the bridge according to the technical parameters.
At present, aiming at the technical parameter detection of bridges, key positions are usually tested regularly, the operation is troublesome, the data is unreliable, and aiming at the existing problems, the patent with the publication number of CN104198144A discloses a quick detection method of small and medium bridges based on a long gauge length optical fiber strain sensor, which comprises the following steps: arranging long-gauge optical fiber sensors on the surfaces of main stress components of the middle and small bridges, then performing impact excitation on the bridge deck by loading impact force, and recording time-course data of dynamic strain of the bridges and time-course data of the impact force through the arranged optical fiber sensors in the impact excitation process; and identifying the strain compliance matrix of the structure from the strain compliance of the structure according to the acquired time-course data of the bridge dynamic strain and the impact force. The method is different from the processing method for acceleration data, which is more researched in the literature, specifically researches strain flexibility identification based on long-gauge strain measurement aiming at the measured long-gauge dynamic strain, and can identify the strain flexibility of the structure to carry out the safety assessment of the structure through the measurement of the long-gauge dynamic strain under impact vibration.
However, when the method is used for measurement, parameters such as dynamic strain of the bridge are detected after impact excitation is applied, and the parameters need to be arranged on points to be detected for detection, in actual situations, because the bridge has a large length, the range of action is limited when a car accident or other collision conditions occur on the bridge, and the corresponding parameters cannot be detected in time when any position on the bridge is abnormal.
Disclosure of Invention
The invention aims to provide a long-distance multi-parameter synchronous detection system for a bridge, which aims to solve the problem that the existing detection method cannot collect bridge parameters in time.
The long-distance multi-parameter synchronous detection system for the bridge comprises an analysis module, a modulation module and an optical fiber sensing module, wherein the analysis module sends optical signals to the modulation module, the modulation module modulates the optical signals into a first detection signal and a second detection signal according to a plurality of frequencies which are arranged in a first sequence and a plurality of frequencies which are arranged in a second sequence respectively, the modulation module sends the first detection signal and the second detection signal to the optical fiber sensing module, the optical fiber sensing module lays along the length direction of the bridge, the optical fiber sensing module respectively transmits the first detection signal and the second detection signal and synchronously senses the change information of the bridge, the change information comprises vibration change, temperature change and stress change, the optical fiber sensing module sends the first echo signal and the second echo signal after the first detection signal and the second detection signal are reflected to the analysis module, and the analysis module receives the first echo signal and the second echo signal for analysis;
the analysis module analyzes a first stress value, a first vibration intensity and a first temperature value of the bridge from the first echo signal to store and display, and analyzes a second stress value, a second vibration intensity and a second temperature value of the bridge from the second echo signal to store and display.
The beneficial effect of this scheme is:
when the parameters of the bridge are detected, the optical signals are modulated according to the frequencies of the first sequence and the second sequence respectively through the modulation module, then the modulated detection signals are sent to the optical fiber sensing module respectively, the optical fiber sensing module is enabled to reflect the detection signals in the process of sensing the change of the parameters of the bridge, and receives echo signals reflected by the detection signals, the analysis module is used for analyzing the echo signals of the two times respectively to obtain the stress value, the vibration intensity and the temperature value of the bridge, and the bridge is stored and displayed, and the bridge is detected after being modulated in different frequency sequences for comparison and check conveniently, so that the most suitable frequency sequence is found for modulation, and the accuracy of bridge parameter detection is improved; the optical fiber sensing module can be directly laid along the length direction of the bridge, can synchronously detect a plurality of parameters on the bridge, is more timely in detection, is not influenced by the outside, can improve the timeliness of detecting the parameter change on different positions of the bridge, is stronger in comparison of a plurality of data, improves the referenceability of the data, provides abundant data references for the diagnosis of bridge faults, and reflects bridge monitoring events in multiple dimensions.
The processing module is used for comparing the stress difference with a first threshold value, comparing the temperature difference with a second threshold value and comparing the intensity difference with a third threshold value to obtain a comparison result, and when the comparison result is the same as the preset result, the preset result is that the stress difference is larger than the first threshold value, or the temperature difference is larger than the second threshold value, or the intensity difference is larger than the third threshold value, the processing module is used for calculating a first abnormal position in the first echo signal according to the comparison result, the processing module is used for calculating a second abnormal position in the second echo signal according to the comparison result, and comparing the first abnormal position with the second abnormal position, and when the first abnormal position is the same as the second abnormal position, the processing module is used for judging that the comparison result is accurate.
The beneficial effects are that: comparing the stress value, the temperature value and the vibration intensity acquired twice with corresponding thresholds respectively after difference, calculating corresponding abnormal positions according to the abnormality of the difference value of the acquired data of the twice, and comparing whether the positions of the abnormality generated by the data acquired twice are the same or not; because the signals acquired for the two times are sent successively, the abnormal position change is not so large, the abnormal positions acquired for the two times are identical, if the abnormal positions acquired for the two times are identical, the judgment result is accurate, and the accuracy of the optical fiber sensing module in carrying out distributed synchronous detection on a plurality of positions on the bridge is improved through the signal detection of different sequence frequencies for the two times.
Further, when the first abnormal position is different from the second abnormal position, the processing module sends a sequence signal to the analysis module, the analysis module modulates the sequence signal into a first detection signal according to a plurality of frequencies arranged in a first sequence according to the sequence signal to perform detection again, the analysis module receives the first echo signal again to analyze a first stress value, a first vibration intensity and a first temperature value, the processing module compares the first stress value, the first vibration intensity and the first temperature value with a second stress value, a second vibration intensity and a second temperature value again, and when the obtained comparison result is different from a preset result, the processing module judges that the modulation sequence is abnormal.
The beneficial effects are that: when the two acquired abnormal positions are different, monitoring is carried out again by using the signals modulated by the first sequence frequency, and the monitored data are judged again, so that the abnormality caused by the frequency modulation of different sequences is eliminated.
Further, when the obtained comparison result is the same as the preset result, the processing module sends a detection signal to the analysis module, the analysis module modulates the detection signal into a third detection signal according to a plurality of frequencies which are arranged in a third sequence, the optical fiber sensing module transmits the third detection signal and then reflects the third detection signal back to the analysis module, the analysis module analyzes a third stress value, a third vibration intensity and a third temperature value from the third echo signal, the processing module judges that the third stress value is compared with the first stress value, the third vibration intensity is compared with the first vibration intensity or the third temperature value is compared with the first temperature value according to the first abnormal position and the comparison result, and when the third stress value is identical with the first stress value, the third vibration intensity is identical with the first vibration intensity or the third temperature value is identical with the first temperature value, the processing module judges that the detection result of frequency modulation which is arranged in the first sequence is accurate, and the processing module judges that the third stress value is identical with the second stress value, the third vibration intensity is identical with the second vibration intensity or the third temperature value is compared with the third vibration intensity or the third temperature value according to the second abnormal position and the comparison result.
The beneficial effects are that: after eliminating the frequency modulation influence factors caused by different sequences, modulating the frequency arranged in a third sequence into a third detection signal, detecting again, judging corresponding data of the third echo signal at the first abnormal position and the second abnormal position to determine a more accurate modulation frequency sequence, and enabling the modulation frequency sequence to be compared with reference, so that the reference is improved, and bridge abnormality is accurately judged.
Further, when the two information are different, the processing module obtains the azimuth information of the bridge, the processing module judges illumination interference information and wind interference information according to the azimuth information and preset environmental information, when the comparison result is a temperature factor, the processing module judges that the optical fiber sensing module is subjected to illumination interference according to the illumination interference information, and when the comparison result is a stress factor or a vibration factor, the processing module judges that the optical fiber sensing module is subjected to wind interference according to the wind interference information.
The beneficial effects are that: when the abnormal data of the monitoring bridge is judged, the interference of illumination and wind power is judged through the azimuth information and the corresponding environment information of the bridge, whether the data are interfered or not is judged according to the temperature, stress and vibration factors, and the referenceability of bridge fault diagnosis and monitoring is improved.
Further, the optical fiber sensing module is located in the bridge or on the outer side wall of the bridge, and the processing module sends abnormal point information to the analysis module when the optical fiber sensing module is located in the bridge.
The beneficial effects are that: when the optical fiber sensing module is positioned in the bridge, the corresponding abnormal generation condition cannot be visually seen, and the abnormal point information is sent to the analysis module, so that the abnormal condition in the bridge can be known in time.
Drawings
FIG. 1 is a schematic block diagram of a first embodiment of a long-distance multi-parameter synchronous detection system for bridges of the present invention;
FIG. 2 is a longitudinal cross-sectional view of a transition piece in a third embodiment of a long-distance multi-parameter synchronous detection system for bridges of the present invention;
fig. 3 is a schematic block diagram of a third embodiment of the long-distance multi-parameter synchronous detection system for bridges of the present invention.
Detailed Description
Further details are provided below with reference to the specific embodiments.
Example 1
A long-distance multi-parameter synchronous detection system for a bridge is shown in fig. 1: the optical signal analysis device comprises an analysis module, a modulation module and an optical fiber sensing module, wherein the analysis module sends an optical signal to the modulation module, the analysis module can use an existing optical fiber decoder, the modulation module modulates the optical signal into a first detection signal and a second detection signal according to a plurality of frequencies which are arranged in a first sequence and a plurality of frequencies which are arranged in a second sequence respectively, the modulation module sends the first detection signal and the second detection signal to the optical fiber sensing module respectively, the optical fiber sensing module is laid along the length direction of a bridge, the optical fiber sensing module is positioned in the bridge or on the outer side wall of the bridge, the optical fiber sensing module respectively transmits the first detection signal and the second detection signal and synchronously senses the change information of the bridge, the change information comprises vibration change, temperature change and stress change, the optical fiber sensing module sends the first echo signal and the second echo signal after the first detection signal and the second detection signal are reflected to the analysis module, and the analysis module receives the first echo signal and the second echo signal for analysis.
The analysis module analyzes a first stress value, a first vibration intensity and a first temperature value of the bridge from the first echo signal to store and display, and analyzes a second stress value, a second vibration intensity and a second temperature value of the bridge from the second echo signal to store and display.
The processing module can use an existing PC host, the processing module calculates a first abnormal position in the first echo signal according to the comparison result, the processing module calculates a second abnormal position in the second echo signal according to the comparison result, the processing module compares the first abnormal position with the second abnormal position, and the processing module judges the result accurately when the first abnormal position is the same as the second abnormal position.
When the first abnormal position is different from the second abnormal position, the processing module sends a sequence signal to the analysis module, the analysis module modulates the sequence signal into a first detection signal according to a plurality of frequencies arranged in a first sequence to detect again, the analysis module receives the first echo signal again to analyze a first stress value, a first vibration intensity and a first temperature value, the processing module compares the first stress value, the first vibration intensity and the first temperature value with a second stress value, a second vibration intensity and a second temperature value again, and when the obtained comparison result is different from a preset result, the processing module judges that the modulation sequence is abnormal.
When the comparison result obtained again is the same as the preset result, the processing module sends a detection signal to the analysis module, the analysis module modulates the detection signal into a third detection signal according to a plurality of frequencies which are arranged in a third sequence, the optical fiber sensing module transmits the third detection signal back to the analysis module to reflect a third echo signal, the analysis module analyzes a third stress value, a third vibration intensity and a third temperature value from the third echo signal, the processing module judges that the third stress value is compared with the first stress value, the third vibration intensity is compared with the first vibration intensity or the third temperature value is compared with the first temperature value according to the first abnormal position and the comparison result, when the third stress value is identical with the first stress value, the third vibration intensity is identical with the first vibration intensity or the third temperature value is identical with the first temperature value, the identical condition that the difference value between the third stress value and the first stress value is within a stress preset range, the same third vibration intensity and the first vibration intensity means that the difference value between the third vibration intensity and the first vibration intensity is within the preset intensity range, the system of the third temperature value and the first temperature value means that the difference value between the third temperature value and the first temperature value is within the preset temperature range, the processing module judges that the detection result of the frequency modulation arranged in the first sequence is accurate, the processing module judges that the third stress value and the second stress value, the third vibration intensity and the second vibration intensity or the third temperature value and the second temperature value are compared according to the second abnormal position and the comparison result, when the third stress value and the second stress value, the third vibration intensity and the second vibration intensity or the third temperature value and the second temperature value are the same, the same third stress value and the second stress value means that the difference value between the third stress value and the second stress value is within the preset stress range, the same third vibration intensity and the same second vibration intensity means that the difference value between the third vibration intensity and the second vibration intensity is in the preset intensity range, the system of the third temperature value and the second temperature value means that the difference value between the third temperature value and the second temperature value is in the preset temperature range, and the processing module judges that the detection result of the frequency modulation of the second sequence arrangement is accurate.
When the third stress value is different from the second stress value, the third vibration intensity is different from the second vibration intensity or the third temperature value is different from the second temperature value, the processing module acquires azimuth information of the bridge, such as the direction of the north and south, the processing module judges illumination interference information and wind power interference information according to the azimuth information and preset environment information, the preset environment information is geographic information and solar landing information of the position of the bridge, when the comparison result is a temperature factor, the processing module judges that the optical fiber sensing module is subjected to illumination interference according to the illumination interference information, and when the comparison result is a stress factor or a vibration factor, the processing module judges that the optical fiber sensing module is subjected to wind power interference according to the wind power interference information.
In the above, the first order may be set to a small-to-large order, the second order may be set to a large-to-small order, and the third order may be set to an irregular order.
The specific implementation process is as follows:
when the parameters of the bridge are detected, the optical signals are modulated according to the frequencies of the first sequence and the second sequence respectively through the modulation module to obtain a first detection signal and a second detection signal respectively, then the modulated first detection signal and the modulated second detection signal are sent to the optical fiber sensing module respectively, the optical fiber sensing module senses the bridge parameters in the process of transmitting the detection signals, receives the first echo signal and the second echo signal reflected by the detection signals, the analysis module analyzes the first echo signal to obtain a first stress value, a first temperature value and a first vibration intensity, and the analysis module analyzes the second echo signal to obtain a second stress value, a second vibration intensity and a second temperature value of the bridge, and the second echo signal is stored and displayed.
The method comprises the steps of respectively obtaining a stress difference, a temperature difference and an intensity difference by a processing module by taking differences among a first stress value, a second stress value, a first temperature value, a second temperature value, a first vibration intensity and a second vibration intensity, comparing the stress difference with a first threshold value, the temperature difference with a second threshold value and the intensity difference with a third threshold value by the processing module, calculating corresponding abnormal positions by the processing module according to the difference value abnormality of the acquired data twice, wherein the difference abnormality is that the stress difference is larger than the first threshold value, the temperature difference is larger than the second threshold value and the intensity difference is larger than the third threshold value, namely, calculating corresponding abnormal positions of the difference when the difference value is abnormal, for example, calculating corresponding two abnormal positions according to echo signals received twice when the temperature difference is abnormal, and comparing whether the positions of the data acquired twice are the same; because the signals acquired for the two times are sent successively, the abnormal position change is not so large, the abnormal positions acquired for the two times are approximately the same, if the abnormal positions acquired for the two times are the same, the judgment result is accurate, and the accuracy of the optical fiber sensing module in carrying out distributed synchronous detection on a plurality of positions on the bridge is improved through the signal detection of different sequence frequencies for the two times.
When the two acquired abnormal positions are different, detecting again by using the first detection signals modulated by the first sequence frequency again, judging the detected data again, and eliminating the abnormality caused by the frequency modulation of different sequences; after eliminating the frequency modulation influence factors caused by different sequences, namely the comparison result obtained again is the same as the preset result, modulating the frequency arranged in a third sequence into a third detection signal, detecting again to obtain a third echo signal, judging the corresponding data of the third echo signal at the first abnormal position and the second abnormal position to determine a more accurate modulation frequency sequence, and enabling the sequence of the modulation frequencies to be compared in a reference mode, so that the referential is improved and bridge abnormality is accurately judged.
When the abnormal data of the monitoring bridge is judged, the interference of illumination and wind power is judged through the azimuth information and the corresponding environment information of the bridge, whether the data are interfered or not is judged according to the temperature, stress and vibration factors, and the referenceability of bridge fault diagnosis and monitoring is improved.
Firstly, the method comprises the steps of firstly modulating twice in different frequency sequences, then detecting, facilitating comparison and checking, finding out the most suitable frequency sequence for modulating, and improving the accuracy of bridge parameter detection; the optical fiber sensing module can be directly laid along the length direction of the bridge, can synchronously detect a plurality of parameters on the bridge, is not influenced by the outside, can improve the timeliness of detecting the parameter change on different positions of the bridge, has stronger contrast of a plurality of data, improves the referenceability of the data, provides abundant data references for the diagnosis of bridge faults, and reflects bridge monitoring events in multiple dimensions.
Example two
The difference from the first embodiment is that the processing module sends the abnormal point information to the analysis module when the optical fiber sensing module is located in the bridge.
When the optical fiber sensing module is positioned in the bridge, the corresponding abnormal generation condition cannot be visually seen, and the abnormal point information is sent to the analysis module, so that the abnormal condition in the bridge can be known in time.
Example III
The difference from the first embodiment is that, as shown in fig. 2 and 3, the reference numerals in the drawings are: the device comprises an elastic tube 1, a cavity 2, metal powder 3, a conductive terminal 4, a groove 5, a friction head 6, a friction rod 7, an optical fiber sensing module 8, an indicator 9 and a power supply 10.
The bridge joint comprises a bridge, and is characterized by further comprising a transition piece positioned at a bridge joint gap, wherein the transition piece comprises an elastic tube 1 sleeved outside an optical fiber sensing module 8, two end parts of the elastic tube 1 are fixedly connected to the bridge at two ends of the joint gap, the outer side wall surface of the elastic tube 1 facing to the upper side is in a cambered surface shape, a plurality of cavities 2 are formed in the tube wall of the elastic tube 1 facing to the upper side, metal powder 3 is filled in the cavities 2, friction strips are adhered to the top wall of the cavities 2, grooves 5 are formed in the friction strips, the inner walls of the grooves 5 are arc-shaped, conductive terminals 4 are adhered to the two end parts of the friction strips, the conductive terminals 4 in the plurality of cavities are connected in parallel, an indicator 9 and a power supply 10 are connected in series, the indicator 9 can be an existing LED lamp, L-shaped friction rods 7 are adhered to the inner walls of the cavities 2, friction heads 6 clamped in the grooves 5 are welded at the end parts of the friction rods 7, the friction heads 6 can be arranged by friction to the friction strips when the bridge is abnormal due to vibration of the friction heads 6, and the friction heads 6 can be made of iron or other metals; the processing module is electrically connected to the conductive terminal 4 through a wire, when the conductive terminal 4 is communicated, an electric signal is sent to the processing module through the wire, the processing module judges the connection position according to the electric signal, if which connection position can be distinguished through a chip pin, the processing module judges whether the connection position is identical to the first abnormal position or not when the first abnormal position is identical to the second abnormal position, and the processing module adds an abnormal label to the first abnormal position when the connection position is identical to the first abnormal position.
Because bridge length is longer generally, in order to be convenient for the maintenance of bridge, a bridge is usually divided into the multistage, and every section bridge body links together after pouring the shaping again and forms the bridge, so have a plurality of joints on the partly sectional type bridge, have the clearance between the bridge body of joint department to lead to the optical fiber sensing module of joint department to directly expose in the air, easily cause optic fibre ageing or damage, and in the bridge use, the bridge vibration that vehicle or external environment arouses easily lets the optical fiber sensing module of joint department produce and pulls or rub, also easily cause ageing or damage of optical fiber sensing module. In the third embodiment, after vibration, friction or pulling is generated at the connection point of the bridge, vibration, pulling or displacement and swinging of the elastic tube are caused, so that the metal powder 3 in the cavity 2 of the inner wall of the elastic tube 1 and the friction head 6 of the friction rod 7 are driven to rub in the groove 5, static electricity is generated in the groove 5 to adsorb the metal powder 3, when the vibration frequency is high, the inner wall of the groove 5 is adsorbed with the metal powder 3, namely, the metal powder forms a communication path, the friction head 6 and the metal powder 3 can be communicated with the two conductive terminals 4, thereby the power supply 10 electrifies the indicator, the indicator is lightened, an electrical signal is sent to the processing module, when the abnormal position is determined, whether the lightened connection position of the indicator is identical to the abnormal position or not is judged, when the connection position is identical to the abnormal position, an abnormal label is added to the abnormal position, the abnormal position is conveniently found to be the connection position in time, so that subsequent accurate analysis can be performed, and inspection staff or management staff can find abnormal movement condition at the connection point after the indicator is lightened; the elastic tube is positioned outside the optical fiber sensing module, namely, the elastic tube is sleeved outside the optical cable, so that the optical fiber sensing module can be prevented from being directly exposed in the environment, the optical fiber sensing module is protected, two ends of the elastic tube are respectively fixed with a bridge at the joint point, and when the bridge shifts and shakes at the joint point, the probability that the optical fiber sensing module is pulled is reduced.
The foregoing is merely exemplary embodiments of the present invention, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (5)
1. A long distance multiparameter synchronous detection system for bridge is characterized in that: the optical fiber sensor module is used for respectively transmitting the first detection signal and the second detection signal and synchronously sensing the change information of the bridge, the change information comprises vibration change, temperature change and stress change, the optical fiber sensor module is used for transmitting the first echo signal and the second echo signal after the first detection signal and the second detection signal are reflected to the analysis module, and the analysis module is used for receiving the first echo signal and the second echo signal for analysis;
the analysis module analyzes a first stress value, a first vibration intensity and a first temperature value of the bridge from the first echo signal to store and display, and analyzes a second stress value, a second vibration intensity and a second temperature value of the bridge from the second echo signal to store and display;
the processing module is used for obtaining a stress difference, a temperature difference and an intensity difference by differentiating the first stress value from the second stress value, the first temperature value from the second temperature value and the first vibration intensity from the second vibration intensity, comparing the stress difference from the first threshold value, comparing the temperature difference from the second threshold value and comparing the intensity difference from the third threshold value, obtaining a comparison result by comparing the intensity difference from the third threshold value, when the comparison result is the same as the preset result, the preset result is that the stress difference is larger than the first threshold value, or the temperature difference is larger than the second threshold value, or the intensity difference is larger than the third threshold value, the processing module is used for calculating a first abnormal position in the first echo signal according to the comparison result, the processing module calculates a second abnormal position in the second echo signal according to the comparison result, compares the first abnormal position with the second abnormal position, when the first abnormal position is different from the second abnormal position, the processing module sends a sequence signal to the analysis module, the analysis module modulates the sequence signal into a first detection signal according to a plurality of frequencies which are arranged in a first sequence according to the sequence signal to carry out re-detection, the analysis module receives the first echo signal again to analyze a first stress value, a first vibration intensity and a first temperature value, the processing module compares the first stress value, the first vibration intensity and the first temperature value with the second stress value, the second vibration intensity and the second temperature value respectively, and when the re-obtained comparison result is different from a preset result, the processing module judges that the modulation sequence is abnormal.
2. The long-distance multi-parameter synchronous detection system for bridges according to claim 1, wherein: when the first abnormal position is the same as the second abnormal position, the processing module judges that the comparison result is accurate.
3. The long-distance multi-parameter synchronous detection system for bridges according to claim 1, wherein: when the comparison result obtained again is the same as the preset result, the processing module sends a detection signal to the analysis module, the analysis module modulates the detection signal into a third detection signal according to a plurality of frequencies which are arranged in a third sequence, the optical fiber sensing module transmits the third detection signal and then reflects the third detection signal back to the analysis module, the analysis module analyzes a third stress value, a third vibration intensity and a third temperature value from the third echo signal, the processing module judges that the third stress value is compared with the first stress value, the third vibration intensity is compared with the first vibration intensity or the third temperature value is compared with the first temperature value according to the first abnormal position and the comparison result, and when the third stress value is identical with the first stress value, the third vibration intensity is compared with the first vibration intensity or the third temperature value is identical with the first temperature value, the processing module judges that the detection result of frequency modulation which is arranged in the first sequence is accurate, and the processing module judges that the third stress value is identical with the second stress value, the third vibration intensity is compared with the second vibration intensity or the third temperature value according to the second abnormal position and the comparison result, and the processing module judges that the third stress value is accurately arranged in the second sequence.
4. A long-distance multi-parameter synchronous detection system for bridges according to claim 3, wherein: when the two types of the information are different, the processing module acquires azimuth information of the bridge, judges illumination interference information and wind interference information according to the azimuth information and preset environmental information, judges that the optical fiber sensing module is subjected to illumination interference according to the illumination interference information when the comparison result is a temperature factor, and judges that the optical fiber sensing module is subjected to wind interference according to the wind interference information when the comparison result is a stress factor or a vibration factor.
5. The long-distance multi-parameter synchronous detection system for bridges according to claim 1, wherein: the optical fiber sensing module is positioned in the bridge or on the outer side wall of the bridge, and the processing module sends abnormal point information to the analysis module when the optical fiber sensing module is positioned in the bridge.
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