CN-121994154-A - Strain monitoring system and optical cable construction process

CN121994154ACN 121994154 ACN121994154 ACN 121994154ACN-121994154-A

Abstract

The application discloses a strain monitoring system and an optical cable construction process, and belongs to the technical field of pipelines. The system is characterized in that pumping light and detection light are respectively emitted from two ends of a sensing optical cable, the pumping light and the detection light generate brillouin scattering, the brillouin scattering light is emitted from the sensing optical cable and enters an optical detector, the optical detector converts an optical signal into an electric signal and sends the electric signal to electronic equipment, and the electronic equipment determines the strain condition of a pipeline body and soil bodies nearby the pipeline body based on the electric signal. Because a part of the sensing optical cable is paved on the surface of the pipeline, and the other part of the sensing optical cable is positioned in the soil nearby the pipeline, the optical signal received by the optical detector can reflect the stress condition of the pipeline body and the soil nearby the pipeline, so that the electronic equipment can determine the strain condition of the pipeline body and the strain condition of the soil nearby the pipeline based on the electric signal converted from the optical signal, the pipeline body and the soil nearby the pipeline are jointly monitored, and the comprehensiveness of the monitoring is improved.

Inventors

LIN XIAOHUI
ZHAO MIN
WANG FEI
MA HONGJUN
LI YU
GUO GE
SUN YUECHEN
LI YONGSHENG
ZHANG XIN
QIAO YUE

Assignees

中国石油管道局工程有限公司
中国石油天然气集团有限公司
中国石油天然气管道通信电力工程有限公司
中国石油天然气管道工程有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. The strain monitoring system is characterized by comprising a sensing optical cable, an optical detector and electronic equipment which are electrically connected in sequence; The two ends of the sensing optical cable are arranged on a pipeline to be monitored, one part of the sensing optical cable is laid on the surface of the pipeline, the other part of the sensing optical cable is positioned in soil near the pipeline, and the sensing optical cable is used for receiving the first path of detection light at one end and the pumping light at the other end, so that brillouin scattering light is obtained; The optical detector is arranged on one side of the pipeline and is used for receiving the Brillouin scattered light, converting the Brillouin scattered light into an electric signal from an optical signal and transmitting the electric signal to the electronic equipment; The electronic equipment is used for receiving the electric signals and determining the strain conditions of the pipeline and soil bodies nearby the pipeline based on the electric signals.
2. The system of claim 1, further comprising an optical switch and a circulator; The optical switch is electrically connected with the first port of the circulator, the second port of the circulator is electrically connected with the sensing optical cable, and the third port of the circulator is electrically connected with the optical detector; the optical switch is used for receiving a second path of detection light, converting the second path of detection light into the pumping light, and enabling the pumping light to enter a first port of the circulator; the circulator is used for emitting the pump light from the second port, and the pump light enters the other end of the sensing optical cable; The circulator is further configured to receive the brillouin scattered light through the second port, emit the brillouin scattered light from the third port, and enter the photodetector.
3. The system of claim 2, further comprising a laser and a coupler; the laser, one end of the coupler and the optical switch are electrically connected in sequence, and the other end of the coupler is electrically connected with the sensing optical cable; the laser is used for emitting detection light; The coupler is used for dividing the detection light into the first path of detection light and the second path of detection light, sending the first path of detection light to the sensing optical cable and sending the second path of detection light to the optical switch.
4. The system of claim 3, wherein the system further comprises an optical frequency modulator; The other end of the coupler is electrically connected with one end of the optical frequency modulator, and the other end of the optical frequency modulator is electrically connected with the sensing optical cable; the coupler is used for sending the first path of detection light to the optical frequency modulator; The optical frequency modulator is used for modulating the frequency of the first path of detection light and sending the first path of detection light after frequency modulation to the sensing optical cable.
5. The system of claim 2, wherein the system further comprises an optical amplifier; the two ends of the optical amplifier are respectively and electrically connected with the optical switch and the first port of the circulator; The optical switch is used for converting the second path of detection light into the pumping light, and the pumping light enters the optical amplifier; the optical amplifier is used for amplifying the signal of the pumping light, and the pumping light after signal amplification enters the first port of the circulator.
6. An optical cable construction process for a strain monitoring system, the strain monitoring system including a sensing optical cable, the process comprising: Fixing the head end of the sensing optical cable at the head end of the pipeline to be monitored; starting from the head end of the pipeline, fixing a part between the head end of the sensing optical cable and the target point on the surface of the pipeline at intervals of a first preset distance until the part reaches the tail end of the pipeline, and fixing the target point of the sensing optical cable on the tail end of the pipeline; And fixing the part between the target point and the tail end of the sensing optical cable in the soil body every a second preset distance from the position of the soil body at the tail end of the pipeline until reaching the position of the soil body at the head end of the pipeline, and fixing the tail end of the sensing optical cable at the position of the soil body at the head end of the pipeline.
7. The process of claim 6, wherein said securing the head end of the sensing fiber optic cable at the head end of the pipe to be monitored comprises: Sticking a viscoelastic body adhesive tape and a polyethylene cold winding tape on the surface of the head end of the sensing optical cable; And fixing the head end of the sensing optical cable at the head end of the pipeline through a hose clamp.
8. The process of claim 6, wherein the sensor fiber optic cable is laid in a first direction, a second direction, and a third direction of an origin with a center of the pipe section as the origin; The first direction is located right above the original point, an angle formed by the first direction, the original point and the second direction is 120 degrees, and an angle formed by the second direction, the original point and the third direction is 120 degrees.
9. The process of claim 6, wherein the sensing fiber optic cable comprises a tight-wrapped single-core fiber optic cable, a loose-jacketed single-core fiber optic cable, and a strength rib.
10. The process of claim 6, wherein the target point is a midpoint of the sensing fiber optic cable, a distance between the midpoint and a head end of the sensing fiber optic cable being equal to a distance between the midpoint and a tail end of the sensing fiber optic cable.

Description

Strain monitoring system and optical cable construction process Technical Field The application relates to the technical field of pipelines, in particular to a strain monitoring system and an optical cable construction process. Background In recent years, due to long-distance laying of long-distance buried pipelines, geological topography of the pipelines along the lines is complicated, natural conditions are bad, the pipelines are often threatened by mountain landslide, flood, earthquake, debris flow, collapse and other high-risk environments, integral displacement, local deformation or stress concentration are extremely easy to cause, and finally, the pipelines are buckled or creep, and even the pipelines are broken and damaged. Therefore, to maintain safe operation of the pipeline, the pipeline needs to be monitored. In the related art, only the pipeline body is monitored, the soil around the pipeline is not monitored, and when the soil around the pipeline is subjected to stress displacement, the pipeline body is also affected, and in the case, the pipeline cannot be monitored by adopting the mode in the related art, so that the monitoring is not comprehensive enough. Disclosure of Invention The embodiment of the application provides a strain monitoring system and an optical cable construction process, which can improve the monitoring comprehensiveness. The technical scheme is as follows: In one aspect, a strain monitoring system is provided, the system comprising a sensing optical cable, an optical detector and an electronic device electrically connected in sequence; The two ends of the sensing optical cable are arranged on a pipeline to be monitored, one part of the sensing optical cable is laid on the surface of the pipeline, the other part of the sensing optical cable is positioned in soil near the pipeline, and the sensing optical cable is used for receiving the first path of detection light at one end and the pumping light at the other end, so that brillouin scattering light is obtained; The optical detector is arranged on one side of the pipeline and is used for receiving the Brillouin scattered light, converting the Brillouin scattered light into an electric signal from an optical signal and transmitting the electric signal to the electronic equipment; The electronic equipment is used for receiving the electric signals and determining the strain conditions of the pipeline and soil bodies nearby the pipeline based on the electric signals. In one possible implementation, the system further comprises an optical switch and a circulator; The optical switch is electrically connected with the first port of the circulator, the second port of the circulator is electrically connected with the sensing optical cable, and the third port of the circulator is electrically connected with the optical detector; the optical switch is used for receiving a second path of detection light, converting the second path of detection light into the pumping light, and enabling the pumping light to enter a first port of the circulator; the circulator is used for emitting the pump light from the second port, and the pump light enters the other end of the sensing optical cable; The circulator is further configured to receive the brillouin scattered light through the second port, emit the brillouin scattered light from the third port, and enter the photodetector. In another possible implementation, the system further includes a laser and a coupler; the laser, one end of the coupler and the optical switch are electrically connected in sequence, and the other end of the coupler is electrically connected with the sensing optical cable; the laser is used for emitting detection light; The coupler is used for dividing the detection light into the first path of detection light and the second path of detection light, sending the first path of detection light to the sensing optical cable and sending the second path of detection light to the optical switch. In another possible implementation, the system further comprises an optical frequency modulator; The other end of the coupler is electrically connected with one end of the optical frequency modulator, and the other end of the optical frequency modulator is electrically connected with the sensing optical cable; the coupler is used for sending the first path of detection light to the optical frequency modulator; The optical frequency modulator is used for modulating the frequency of the first path of detection light and sending the first path of detection light after frequency modulation to the sensing optical cable. In another possible implementation, the system further comprises an optical amplifier; the two ends of the optical amplifier are respectively and electrically connected with the optical switch and the first port of the circulator; The optical switch is used for converting the second path of detection light into the pumping light, and the pumping light enters the optical ampl