CN113125455A - Terahertz quasi-optical detection device and nonmetal pipeline detection system and method - Google Patents
Terahertz quasi-optical detection device and nonmetal pipeline detection system and method Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/9515—Objects of complex shape, e.g. examined with use of a surface follower device
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Abstract
The invention discloses a terahertz quasi-optical detection device, which realizes nondestructive detection of internal structures of non-metallic materials such as PE and the like, and further provides a non-metallic pipeline detection system and a method, so as to realize detection of non-metallic pipelines. The nonmetal pipeline detection system comprises a terahertz quasi-optical detection device, an upper computer and a displacement control device; the terahertz quasi-optical detection device comprises a primary radiation source module, a frequency multiplier module, a cylindrical lens antenna, a terahertz detector, a signal control processing module and a radiation antenna module. The invention adopts terahertz technology to easily penetrate non-metal pipeline materials such as PE and the like to detect the internal structure thereof, the detection device and the system can distinguish the defect of millimeter size, and because the wavelength is far greater than the ray, the photon energy is lower, and no ionizing radiation exists on the human body.
Description
Technical Field
The invention belongs to the technical field of terahertz nondestructive testing, and particularly relates to a nondestructive testing device for a nonmetal pipeline.
Background
Non-metal pipes such as Polyethylene (PE)/polypropylene (PP) materials are ideal pipes for replacing common metal pipes due to the characteristics of high strength, corrosion resistance, no toxicity and the like, and are widely applied to the fields of water supply, energy sources and the like.
The development of non-metal pipelines in China is fast, and the utilization rate is continuously improved. According to statistics, only in 2015 years, the new increasing usage amount of Polyethylene (PE) gas pipes in China exceeds 130 ten thousand tons, and the market demand of the PE gas pipes is rapidly increased. Polyethylene materials commonly used as fuel gas pipelines at present are mainly PE80 and PE 100.
In the production or use process of the non-metal pipe, in order to ensure the safety, the quality of the non-metal pipe needs to be detected, the existing non-metal pipe detection method mainly adopts ultrasonic detection, the detection is very obvious under the influence of the external environment in the detection process of the non-metal pipe, the detection error is large, the success rate is not high, and the use safety of the PE pipe is difficult to ensure.
Terahertz (Terahertz) waves generally refer to electromagnetic waves having a wavelength in the range of 30 μm to 3mm (i.e., a frequency of 0.1THz to 10THz), and the frequency band thereof is located between microwave and infrared light, and have many unique advantages, such as high permeability, low energy, selective absorption, and the like. Terahertz waves have the characteristic of being penetrable to nonmetallic materials such as polyethylene and the like, so that detection of the nonmetallic materials by using terahertz waves is a good choice, but reports of related technology application are not found at present.
Disclosure of Invention
The invention aims to provide a terahertz quasi-optical detection device, which realizes nondestructive detection of internal structures of non-metallic materials such as PE and further provides a non-metallic pipeline detection system and method, and realizes detection of non-metallic pipelines.
In order to solve the technical problems, the invention provides a terahertz quasi-optical detection device, which adopts the following technical scheme:
the terahertz quasi-optical detection device comprises a primary radiation source module, a frequency multiplier module, a cylindrical lens antenna, a terahertz detector, a signal control processing module and a radiation antenna module;
the first-stage radiation source module is a first-stage radiation source and is used for generating terahertz fundamental wave radiation;
the frequency multiplier module is used for multiplying the terahertz fundamental wave radiation frequency generated by the primary radiation source to a terahertz waveband;
the radiation antenna module is a terahertz combined antenna and consists of a terahertz diagonal antenna and a cylindrical lens antenna, and the two antennas are functionally combined to realize the optical path modulation of terahertz waves;
the terahertz detector comprises a linear detection imaging array chip and an amplification conditioning circuit array chip, wherein the linear detection imaging array chip is mainly used for converting a received terahertz optical signal into an electric signal, and the amplification conditioning circuit array chip is used for amplifying and conditioning the converted electric signal;
and the signal control processing module is used for conditioning, collecting and processing the electric signal detected and converted by the terahertz detector and outputting the electric signal to an upper computer.
Furthermore, the signal control processing module comprises a signal conditioning submodule, a signal acquisition submodule and an algorithm submodule, and is used for conditioning, acquiring and processing signals obtained by detecting the terahertz detector and controlling the working time sequence of each extension of the system.
The signal conditioning submodule amplifies and filters an electric signal detected and converted by the terahertz detector;
the signal acquisition submodule acquires the electric signal processed by the conditioning submodule and transmits the acquired signal to the algorithm submodule;
the algorithm submodule processes the received acquisition signal and comprises signal filtering, signal noise reduction, pixel compensation, image enhancement, image splicing and image output.
The invention provides a nonmetal pipeline detection system based on a terahertz quasi-optical detection device, which adopts the following technical scheme:
the nonmetal pipeline detection system comprises a terahertz quasi-optical detection device, an upper computer and a displacement control device;
the signal control processing module of the terahertz quasi-optical detection device also comprises a control submodule, wherein the control submodule is mainly used for coordinating the time sequence coordination among the terahertz quasi-optical detection device, the displacement control device and an upper computer and is also used for calibrating and adjusting the position, the angle and the speed of the displacement control device;
the upper computer is used for controlling the control sub-module signals, processing the collected image information, performing figure reshaping and generating a visual and visible three-dimensional figure;
the displacement control device receives the instruction of the control submodule and is used for adjusting the relative position relation between the terahertz quasi-light detection device and the to-be-detected nonmetal pipeline, so that terahertz wave can irradiate the to-be-detected nonmetal pipeline in parallel and rotate around the nonmetal pipeline for a circle.
Furthermore, the displacement control device comprises a terahertz quasi-optical detection system bearing structure, a non-metal pipeline fixing structure, a rotary scanning displacement structure and a scanning control center module;
the bearing structure of the terahertz quasi-optical detection device is mainly used for fixing all components of the terahertz quasi-optical detection system at corresponding positions along a terahertz radiation optical path;
the non-metal pipeline fixing structure is of an annular structure and is used for fixing the terahertz quasi-optical monitoring device bearing structure, the rotary scanning device and the scanning control center module around the non-metal pipeline outside the annular structure, and the surrounding central axis is superposed with the central axis of the non-metal pipeline;
the rotary scanning displacement structure comprises a gear transmission device and a position and angle sensor and is used for driving the non-metal pipeline fixing structure to rotate around the non-metal pipeline so as to carry out scanning detection on the non-metal pipeline;
the scanning control center receives the command information of the control submodule and controls the execution of the rotary scanning displacement structure;
before the detection starts, the position and the angle of each component of the terahertz quasi-optical detection device are positioned through a sensor, and an initial value is uploaded to a scanning control center module;
after the detection is started, the scanning control center module triggers a time sequence according to physical information of displacement angles of all the components fed back by the sensors, and starts a gear transmission device to drive the non-metal pipeline fixing structure to rotate around the non-metal pipeline so as to start scanning and collecting work;
after the nonmetal pipe rotates for a circle, the position sensor returns to the initial point, the sensor uploads position information to the scanning control center module, and the scanning control center module controls the gear transmission device to be closed, so that the scanning collection work is finished.
The invention provides a non-metal pipeline detection method based on a non-metal pipeline detection system, which comprises the following steps:
step S1: starting a power switch of the nonmetal pipeline detection system, generating an initial terahertz wave by a terahertz radiation source, and performing self calibration in an environment without a detected object to form a standard comparison database;
step S2: fixing a non-metal pipeline to be detected to the axis position of a non-metal pipeline detection system; the method comprises the following steps that the positions of a terahertz quasi-optical detection device and a non-metal pipeline are adjusted through a sensor, the initial positions and angles of all components of the terahertz quasi-optical detection device are positioned, and the initial values are uploaded to a scanning control center module;
step S3: the radiation source generates parallel terahertz waves after modulation to irradiate the nonmetal pipeline;
step S4: the upper computer sends a scanning acquisition instruction to the control submodule, the scanning control center module triggers a time sequence after receiving the acquisition instruction of the control submodule, and the gear transmission device is started to drive the non-metal pipeline fixing structure to rotate around the non-metal pipeline so as to start scanning acquisition work;
step S5: the terahertz waves penetrating through the nonmetal pipeline are compressed in a view field through a cylindrical lens antenna, received by a terahertz detector and converted into electric signals containing image information of the nonmetal pipeline;
step S6: the electric signals are output to a signal control processing module, are subjected to signal conditioning, acquisition and processing, and are uploaded to an upper computer, and the upper computer generates a terahertz image or a terahertz image of the detected object by adopting a 3D remodeling algorithm and combining angle information of a displacement control device;
step S7: after the nonmetal pipeline rotates for a circle, the position sensor returns to the starting point, the sensor uploads position information to the scanning control center module, and the scanning control center module controls the gear transmission device to be closed, so that the scanning collection work is finished.
Compared with the prior art, the invention has the beneficial effects that:
the current non-metal pipeline nondestructive testing mainly adopts ultrasonic and manual visual inspection modes for testing, and has the defects of large attenuation, low efficiency, low testing speed and the like. The terahertz quasi-optical detection device and the non-metal pipeline detection system can easily penetrate through non-metal pipeline materials such as PE and the like by adopting a terahertz technology to detect the internal structure of the non-metal pipeline, can distinguish the defect of millimeter size by the detection device and the system, and have no ionizing radiation to a human body because the wavelength of the terahertz quasi-optical detection device is far greater than that of rays and the photon energy is lower.
The terahertz quasi-optical detection device and the nonmetal pipeline detection system provided by the invention are nondestructive detection devices working in terahertz wave bands, high-resolution linear detection imaging array chips are adopted, the pixel pitch of a linear detector is less than 300 mu m, the theoretical maximum resolution can reach more than 0.5mm, and terahertz detection can be accurately carried out on nonmetal pipelines.
The nonmetal pipeline detection system provided by the invention adopts a surrounding scanning detection imaging working mode, so that the external outline three-dimensional imaging of the detected object can be realized by combining a three-dimensional remodeling algorithm, and the identification accuracy of the detected object can be effectively improved.
Drawings
FIG. 1 is a block diagram of a nondestructive testing apparatus for PE pipes in an embodiment of the present invention;
FIG. 2 is a flowchart of a terahertz nondestructive testing method in an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.
The embodiment of the invention discloses a terahertz quasi-optical detection device which can realize nondestructive detection on internal structures of non-metallic materials such as PE (polyethylene).
The terahertz quasi-optical detection device comprises a primary radiation source module 1, a frequency multiplier module 2, a cylindrical lens antenna 4, a terahertz detector 5, a signal control processing module 6 and a radiation antenna module 9.
The primary radiation source module 1 is a primary radiation source and is configured to generate terahertz fundamental radiation, and the radiation module described herein is an IMPATT diode radiation module, but is not limited to this type of module, and may also be a microwave frequency doubling link module.
The frequency multiplier module 2 is used for multiplying the terahertz fundamental wave radiation frequency generated by the primary radiation source to a terahertz wave band. The frequency multiplier module 2 can adopt diode or triode frequency multiplication chip
The radiation antenna module 9 is a terahertz combined antenna, and is composed of a terahertz diagonal antenna and a cylindrical lens antenna 4, and the two antennas are functionally combined to modulate a terahertz wave light path.
Specifically, the terahertz wave is transmitted from the terahertz radiation source to the diagonal antenna through the waveguide structure, the diagonal antenna amplifies and gains the received terahertz wave and transmits the amplified terahertz wave to the cylindrical lens antenna, and the cylindrical lens antenna modulates the transmission direction of the terahertz wave and outputs the parallel terahertz wave 10. The cylindrical lens antenna 4 performs field compression modulation on the transmitted parallel terahertz waves 10 and focuses the waves on the terahertz detector 5.
The adopted terahertz diagonal antenna and the cylindrical lens antenna 4 are both products sold in the market. The cylindrical lens antenna 4 is made of Teflon, TPX material or high-purity silicon material, and the focal length is 25.4 mm.
The terahertz detector 5 comprises a linear detection imaging array chip and an amplifying and conditioning circuit array chip, and the technology is described in the following patent: CNET01010297633.5, entitled: a terahertz detector.
The linear detection imaging array chip is mainly used for converting a received terahertz optical signal into an electric signal, and the amplification conditioning circuit array chip is used for amplifying and conditioning the converted electric signal. By integrating the linear detection imaging array chip and the amplification conditioning circuit chip, the detection and the processing of the parallel terahertz wave signals on the nonmetal pipeline are realized, the terahertz detection imaging speed is greatly improved, and the rapid line scanning nondestructive detection of the nonmetal pipeline is realized.
The linear detection imaging array chip and the amplification conditioning circuit array chip are distributed in a consistent manner and are all 1 XN structural array elements, the linear detection imaging array chip and the amplification conditioning circuit array chip are easy to integrate through the structural design, and integrated packaging is carried out through a semiconductor technology according to the tile type SIP integrated packaging requirement.
Specifically, the tile-type SIP integrated package is realized by performing inverted pile vertical interconnection between the amplifying and conditioning circuit unit of the amplifying and conditioning array and the corresponding pixel of the linear detection imaging array by adopting an indium column structure.
The signal control processing module 6 is mainly used for conditioning, collecting and processing the electric signals detected and converted by the terahertz detector 5 and outputting the electric signals to an upper computer.
The signal control processing module 6 comprises a signal conditioning submodule, a signal acquisition submodule and an algorithm submodule, and is used for conditioning, acquiring and processing signals obtained by detection of the terahertz detector 5 and controlling the working time sequence of each extension of the system.
The signal conditioning submodule amplifies and filters an electric signal detected and converted by the terahertz detector 5;
the signal acquisition submodule is used for carrying out high-precision acquisition on the electric signals processed by the conditioning submodule and transmitting the acquired signals to the algorithm submodule.
The algorithm submodule processes the received acquisition signal and mainly comprises the functions of signal filtering, signal noise reduction, pixel compensation, image enhancement, image splicing, image output and the like.
It should be noted that the collected signal processing technique is well known to those skilled in the art and will not be described herein.
Further, based on the terahertz quasi-optical detection device, the invention discloses a non-metal pipeline detection system.
The following describes an embodiment of the non-metal pipeline detection system according to the present invention, taking a PE pipeline as an example.
As shown in fig. 1, the non-metal pipeline detection system includes a terahertz quasi-optical detection device, an upper computer 7, and a displacement control device 8.
The signal control processing module 6 of the terahertz quasi-optical detection device further comprises a control submodule, and the control submodule is mainly used for coordinating the timing sequence coordination among the terahertz quasi-optical detection device, the displacement control device 8 and an upper computer. The control submodule is also used for position, angle, speed calibration and adjustment of the displacement control means 8.
Specifically, the control sub-module precisely adjusts the relative position relationship between the terahertz quasi-optical detection device and the to-be-detected nonmetal pipeline by controlling the displacement device 8, so that terahertz wave can irradiate the to-be-detected nonmetal pipeline in parallel; and (3) carrying out field compression on the parallel waves after the parallel waves penetrate through the nonmetal pipeline to be detected, detecting a final signal by a terahertz detector 5, and outputting displacement and angle information of the terahertz quasi-optical detection device to an upper computer.
And the upper computer 7 is mainly used for further processing the collected image information, performing figure reshaping and generating a visual and visual three-dimensional figure.
Specifically, the upper computer processes the received signals to generate a two-dimensional image for display, analyzes and judges information in the image through an image algorithm, and marks and displays possible defects.
When the nonmetal pipeline needs to be detected, a scanning acquisition instruction is sent to the control submodule through the upper computer 7.
The displacement control device 8 comprises a terahertz quasi-optical detection device bearing structure, a non-metal pipeline fixing structure, a rotary scanning displacement structure and a scanning control center module.
The bearing structure of the terahertz quasi-optical detection device is mainly used for fixing all components of the terahertz quasi-optical detection device at corresponding positions along a terahertz radiation optical path.
The nonmetal pipeline fixing structure is an annular structure and is mainly used for fixing the terahertz quasi-optical detection device bearing structure, the rotary scanning device and the scanning control center module on the outer side of the annular structure around the nonmetal pipeline 3 and coinciding the central axis of the nonmetal pipeline 3 around the central axis. The nonmetal pipeline 3 is positioned between the diagonal antenna and the cylindrical lens antenna 4, and the parallel terahertz waves 10 penetrate through the nonmetal pipeline 3. The non-metal pipeline 3 is made of PE (polyethylene), PP (polypropylene), PVC (polyvinyl chloride) or organic glass and the like.
The rotary scanning displacement structure comprises a gear transmission device and a position and angle sensor, and is used for driving the non-metal pipeline fixing structure to rotate around the non-metal pipeline so as to carry out non-metal pipeline scanning detection.
Specifically, the angle and position sensor is arranged inside the gear transmission device and used for measuring the current position and angle information of the terahertz quasi-optical detection system.
The scanning control center is mainly used for receiving command information of the control submodule and controlling the rotary scanning displacement structure to execute.
Specifically, the scanning control center is matched with a rotary scanning displacement structure to realize functions of initial position calibration, movement speed control, acquisition work time sequence triggering and the like.
The function of the displacement control device 8 is realized as follows:
before the detection starts, the position and the angle of each component of the terahertz quasi-optical detection device are positioned through a sensor, and initial values are uploaded to a scanning control center module.
After the detection is started, the scanning control center module triggers a time sequence according to physical information such as displacement angles of all the components fed back by the sensors, and starts a gear transmission device to drive the non-metal pipeline fixing structure to rotate around the non-metal pipeline so as to start scanning and collecting work. The scanning control center module uploads the collected angle information of the terahertz quasi-optical detection device to the control submodule, and the angle information is transmitted to the upper computer by the control submodule.
After the nonmetal pipe rotates for a circle, the position sensor returns to the initial point, the sensor uploads position information to the scanning control center module, and the scanning control center module controls the gear transmission device to be closed, so that the scanning collection work is finished.
Further, taking PE pipe detection as an example, the present invention provides a method for detecting a PE pipe, as shown in fig. 2, including the following steps:
step S1: starting a power switch of the nonmetal pipeline detection system, generating an initial terahertz wave by a terahertz radiation source, and performing self calibration in an environment without a detected object to form a standard comparison database;
step S2: fixing the PE pipeline to be detected to the axis position of the detection device; the method comprises the following steps that the positions of a terahertz quasi-optical detection device and a PE pipeline are adjusted through a sensor, the initial positions and angles of all components of the terahertz quasi-optical detection device are positioned, and the initial values are uploaded to a scanning control center module;
step S3: the radiation source generates parallel terahertz waves after modulation to irradiate the PE pipeline;
step S4: the upper computer sends a scanning acquisition instruction to the control submodule, the scanning control center module triggers a time sequence after receiving the acquisition instruction of the control submodule, and the starting gear transmission device drives the non-metal pipeline fixing structure to rotate around the PE pipeline to start scanning acquisition work. If the interior of the PE tube has defects, terahertz waves can be reflected to different degrees, so that the intensity of terahertz electromagnetic field penetrating through the PE tube can be changed;
step S5: the terahertz waves penetrating through the nonmetal PE pipeline are compressed in a view field through the cylindrical lens antenna 4 and then received by the terahertz detector 5, and the terahertz waves are converted into electric signals containing image information of the PE pipeline;
step S6: the electric signals are output to the signal control processing module 6, are subjected to signal conditioning, signal acquisition and signal processing, and are uploaded to the upper computer 7, and the upper computer 7 generates a terahertz image or a terahertz image of the detected object by adopting a 3D remodeling algorithm and combining angle information of the displacement control device 8.
Step S7: after the PE pipeline rotates for a circle, the position sensor returns to the starting point, the sensor uploads position information to the scanning control center module, the scanning control center module controls the gear transmission device to be closed, and scanning collection work is finished.
Claims (5)
1. A terahertz quasi-optical detection device is characterized by comprising a primary radiation source module (1), a frequency multiplier module (2), a cylindrical lens antenna (4), a terahertz detector (5), a signal control processing module (6) and a radiation antenna module (9);
the primary radiation source module (1) is a primary radiation source and is used for generating terahertz fundamental wave radiation;
the frequency multiplier module (2) is used for multiplying the terahertz fundamental wave radiation frequency generated by the primary radiation source to a terahertz waveband;
the radiation antenna module (9) is a terahertz combined antenna and consists of a terahertz diagonal antenna and a cylindrical lens antenna (4), and the two antennas are functionally combined to modulate a terahertz wave optical path;
the terahertz detector (5) comprises a linear detection imaging array chip and an amplification conditioning circuit array chip, wherein the linear detection imaging array chip is mainly used for converting a received terahertz optical signal into an electric signal, and the amplification conditioning circuit array chip is used for amplifying and conditioning the converted electric signal;
and the signal control processing module (6) is used for conditioning, collecting and processing the electric signals detected and converted by the terahertz detector (5) and outputting the electric signals to an upper computer.
2. The terahertz quasi-optical detection device as claimed in claim 1, wherein the signal control processing module (6) comprises a signal conditioning sub-module, a signal acquisition sub-module, and an algorithm sub-module, and is configured to condition, acquire, process, and control the operation timings of the respective extensions of the system, respectively, for the signals detected by the terahertz detector (5).
The signal conditioning submodule amplifies and filters an electric signal detected and converted by the terahertz detector (5);
the signal acquisition submodule acquires the electric signal processed by the conditioning submodule and transmits the acquired signal to the algorithm submodule;
the algorithm submodule processes the received acquisition signal and comprises signal filtering, signal noise reduction, pixel compensation, image enhancement, image splicing and image output.
3. A nonmetal pipeline detection system based on claim 1, which comprises a terahertz quasi-optical detection device, an upper computer (7) and a displacement control device (8);
the signal control processing module (6) of the terahertz quasi-optical detection device also comprises a control submodule, wherein the control submodule is mainly used for coordinating the time sequence coordination among the terahertz quasi-optical detection device, the displacement control device (8) and an upper computer and calibrating and adjusting the position, the angle and the speed of the displacement control device (8);
the upper computer (7) is used for controlling the control submodule through signals, processing the collected image information, performing figure reshaping and generating a visual and visible three-dimensional figure;
the displacement control device (8) receives the instruction of the control submodule and is used for adjusting the relative position relation between the terahertz quasi-light detection device and the to-be-detected nonmetal pipeline, so that terahertz wave can irradiate the to-be-detected nonmetal pipeline in parallel and rotate around the nonmetal pipeline for a circle.
4. The non-metal pipeline detection system according to claim 3, wherein the displacement control device (8) comprises a terahertz quasi-optical detection system bearing structure, a non-metal pipeline fixing structure, a rotary scanning displacement structure and a scanning control center module;
the bearing structure of the terahertz quasi-optical detection device is mainly used for fixing all components of the terahertz quasi-optical detection system at corresponding positions along a terahertz radiation optical path;
the non-metal pipeline fixing structure is of an annular structure and is used for fixing the terahertz quasi-optical monitoring device bearing structure, the rotary scanning device and the scanning control center module around the non-metal pipeline outside the annular structure, and the surrounding central axis is superposed with the central axis of the non-metal pipeline;
the rotary scanning displacement structure comprises a gear transmission device and a position and angle sensor and is used for driving the non-metal pipeline fixing structure to rotate around the non-metal pipeline so as to carry out scanning detection on the non-metal pipeline;
the scanning control center receives the command information of the control submodule and controls the execution of the rotary scanning displacement structure;
before the detection starts, the position and the angle of each component of the terahertz quasi-optical detection device are positioned through a sensor, and an initial value is uploaded to a scanning control center module;
after the detection is started, the scanning control center module triggers a time sequence according to physical information of displacement angles of all the components fed back by the sensors, and starts a gear transmission device to drive the non-metal pipeline fixing structure to rotate around the non-metal pipeline so as to start scanning and collecting work;
after the nonmetal pipe rotates for a circle, the position sensor returns to the initial point, the sensor uploads position information to the scanning control center module, and the scanning control center module controls the gear transmission device to be closed, so that the scanning collection work is finished.
5. A non-metallic pipeline inspection method based on claim 3, characterized by comprising the steps of:
step S1: starting a power switch of the nonmetal pipeline detection system, generating an initial terahertz wave by a terahertz radiation source, and performing self calibration in an environment without a detected object to form a standard comparison database;
step S2: fixing a non-metal pipeline to be detected to the axis position of a non-metal pipeline detection system; the method comprises the following steps that the positions of a terahertz quasi-optical detection device and a non-metal pipeline are adjusted through a sensor, the initial positions and angles of all components of the terahertz quasi-optical detection device are positioned, and the initial values are uploaded to a scanning control center module;
step S3: the radiation source generates parallel terahertz waves after modulation to irradiate the nonmetal pipeline;
step S4: the terahertz quasi-optical monitoring system cooperates with the displacement control device (8) to carry out rotary scanning detection on the nonmetal pipeline;
step S5: the terahertz waves penetrating through the nonmetal pipeline are compressed in a view field through a cylindrical lens antenna (4), then received by a terahertz detector (5), and converted into electric signals containing image information of the PE pipeline;
step S6: the electric signals are output to a signal control processing module (6), and are uploaded to an upper computer (7) after signal conditioning, acquisition and processing are carried out, and the upper computer (7) generates a terahertz image or a terahertz image of the detected object by combining a 3D remodeling algorithm with angle information of a displacement control device (8);
step S7: after the nonmetal pipeline rotates for a circle, the position sensor returns to the starting point, the sensor uploads position information to the scanning control center module, and the scanning control center module controls the gear transmission device to be closed, so that the scanning collection work is finished.
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