CN111665212A - Terahertz wave detection device - Google Patents
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Abstract
The invention discloses a terahertz wave detection device. The terahertz wave detection device comprises a terahertz wave generator and a terahertz wave receiver; the terahertz wave generator consists of a terahertz wave source, a terahertz wave power amplifier and a terahertz wave transmitting antenna; the terahertz wave receiver consists of a terahertz wave receiving antenna, a multi-stage terahertz wave amplifier, a terahertz wave detector and a direct current amplifier; the terahertz wave generator and the terahertz wave receiver are respectively arranged at opposite positions on the outer side of the pipe along the diameter of the pipe; the terahertz wave generator transmits continuous wave terahertz waves to the pipe, and the terahertz wave receiver receives the continuous wave terahertz waves transmitted through the pipe and outputs direct-current voltage signals. The invention can effectively avoid the influence of production environment factors such as flash, dust, temperature, water vapor and the like in the process of detecting the quality of the pipe, and improve the detection precision.
Description
Technical Field
The invention relates to the technical field of pipe detection, in particular to a terahertz wave detection device.
Background
With the rapid development of the industry, the quality standard of various pipes, especially non-metal pipes such as plastic pipes, is higher and higher as one of the most common workpieces in the industry. At present, in the production process of non-metal pipes such as plastic pipes and the like, the following methods are mainly adopted to detect the quality of the pipes:
1. optical methods, i.e. detection with laser, X-ray. When passing through the substance to be measured, photons interact with the substance, and a part of the photons are scattered, absorbed by the substance and transmitted through the substance. And calculating the thickness of the measured substance according to the relation between the intensity of the rays penetrating through the measured substance and the thickness of the substance. Based on an optical method, the detection device is easily influenced by flash, dust and the like in the detection process, the detection precision is reduced, and the production cost is higher.
2. Ultrasonic methods, i.e. detection using ultrasound. Similarly, when ultrasonic waves pass through a substance to be measured, they interact with the substance, and some of them are scattered, some of them are absorbed by the substance, and some of them pass through the substance. And calculating the thickness of the measured substance according to the relation between the intensity of the ultrasonic wave penetrating through the measured substance and the thickness of the substance. Based on the ultrasonic method, a coupling medium is needed in the detection process, and the detection precision is reduced due to the influence of temperature, water vapor and the like.
3. The terahertz wave method is to detect terahertz (100-4000 GHz, 0.1-10 THz) wave pulse technology. The terahertz wave pulse technology is that a high-power optical fiber laser is used for generating terahertz pulses to irradiate a detection target, and the wall thickness is measured through reflected waves impacting an inner boundary layer and an outer boundary layer. Based on the terahertz wave method, the defect of optical detection still exists.
Based on the prior art, in the pipe quality detection process, the influence of production environment factors such as flash of light, dust, temperature, vapor easily receives, reduces and detects the precision.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the terahertz wave detection device which can effectively avoid the influence of production environment factors such as flash, dust, temperature, water vapor and the like in the pipe quality detection process and improve the detection precision.
In order to solve the above technical problem, an embodiment of the present invention provides a terahertz wave detection apparatus, including a terahertz wave generator and a terahertz wave receiver; the terahertz wave generator consists of a terahertz wave source, a terahertz wave power amplifier and a terahertz wave transmitting antenna; the terahertz wave receiver consists of a terahertz wave receiving antenna, a multi-stage terahertz wave amplifier, a terahertz wave detector and a direct current amplifier;
the terahertz wave generator and the terahertz wave receiver are respectively arranged at opposite positions on the outer side of the pipe along the diameter of the pipe;
the terahertz wave generator transmits continuous wave terahertz waves to the pipe, and the terahertz wave receiver receives the continuous wave terahertz waves transmitted through the pipe and outputs direct-current voltage signals.
Further, the terahertz wave generator is arranged on a first rail trolley, the terahertz wave receiver is arranged on a second rail trolley, and the first rail trolley and the second rail trolley are respectively arranged at opposite positions of the annular track along the diameter of the annular track on the outer side of the pipe;
the first rail trolley drives the terahertz wave generator to move on the annular track under the driving of the first walking motor, and the second rail trolley drives the terahertz wave receiver to move on the annular track under the driving of the second walking motor.
Further, the first and second rail cars move clockwise or counterclockwise on the endless track at the same speed.
Further, the wheels of the first rail trolley and the wheels of the second rail trolley are buckled with the annular rails.
Further, a plurality of photoelectric sensors are arranged on the annular track at equal intervals.
Further, the working frequency of the continuous wave terahertz wave is any one of 300-1000 GHz.
Further, the terahertz wave detection device further comprises a display, and the display is connected with the terahertz wave receiver;
and the display outputs corresponding waveforms according to the direct current voltage signals.
Further, the terahertz wave detection device further comprises a power supply device, and the power supply device supplies power to the terahertz wave generator and the terahertz wave receiver.
Further, the terahertz wave detection device further comprises a power supply device, and the power supply device supplies power to the terahertz wave generator, the terahertz wave receiver, the first walking motor and the second walking motor.
Further, the power supply device includes a brush.
The embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a terahertz wave detection device comprising a terahertz wave generator and a terahertz wave receiver, wherein the terahertz wave generator and the terahertz wave receiver are respectively arranged at opposite positions on the outer side of a pipe along the diameter of the pipe, the terahertz wave generator emits continuous wave terahertz waves to the pipe, the terahertz wave receiver receives the continuous wave terahertz waves transmitted through the pipe and outputs direct current voltage signals, so that the problems of sinking, bulging and the like of the pipe in the production process can be found according to the direct current voltage signals, and the quality of the pipe can be detected. Compared with the prior art, the embodiment of the invention transmits the continuous wave terahertz waves to the pipe through the terahertz wave generator, and can effectively avoid the influence of production environment factors such as flash, dust, temperature, water vapor and the like in the pipe quality detection process by utilizing the transmission characteristics of strong penetrating power and small loss of the continuous wave terahertz waves, thereby improving the detection precision.
Drawings
Fig. 1 is a schematic structural diagram of a terahertz wave detection apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a terahertz wave generator in an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a terahertz wave receiver in an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a preferred embodiment of the present invention;
FIG. 5 is a diagram illustrating a movement trace of a terahertz wave detecting device according to an embodiment of the present invention;
FIG. 6 is a waveform diagram of an output of a display according to an embodiment of the present invention.
Wherein the reference numbers in the drawings of the specification are as follows:
1: a terahertz wave generator; 11: a terahertz wave source; 12: a terahertz wave power amplifier; 13: a terahertz wave transmitting antenna; 2: a terahertz wave receiver; 21: a terahertz wave receiving antenna; 22: a multi-stage terahertz wave amplifier; 23: a terahertz wave detector; 24: a DC amplifier; 3: emitting continuous wave terahertz waves; 4: receiving continuous wave terahertz waves; 5: transmitting a continuous wave terahertz wave; 6: the outer wall of the pipe; 7: the inner wall of the pipe; 81: a tube depression; 82: the raised part of the pipe; 83: a waveform reference line; 9: a rail trolley; 91: a traveling motor; 10: an annular track; 14: a photoelectric sensor.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, 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.
Please refer to fig. 1-6.
As shown in fig. 1 to 3, an embodiment of the present invention provides a terahertz wave detection apparatus including a terahertz wave generator 1 and a terahertz wave receiver 2; the terahertz wave generator 1 consists of a terahertz wave source 11, a terahertz wave power amplifier 12 and a terahertz wave transmitting antenna 13; the terahertz wave receiver 2 consists of a terahertz wave receiving antenna 21, a multi-stage terahertz wave amplifier 22, a terahertz wave detector 23 and a direct current amplifier 24; the terahertz wave generator 1 and the terahertz wave receiver 2 are respectively arranged at opposite positions on the outer side of the pipe along the diameter of the pipe; the terahertz wave generator 1 emits continuous wave terahertz waves to the pipe, and the terahertz wave receiver 2 receives the continuous wave terahertz waves transmitted through the pipe and outputs direct-current voltage signals.
It should be noted that the terahertz wave generator 1 is not in contact with the outer wall 6 of the pipe, and the terahertz wave receiver 2 is not in contact with the outer wall 6 of the pipe. The pipe comprises a non-metal pipe such as a plastic pipe.
Illustratively, the quality of the pipe can be detected by arranging the terahertz wave generator 1 at the outer side of the pipe along one end of the diameter of the pipe, arranging the terahertz wave receiver 2 at the outer side of the pipe along the other end of the diameter of the pipe, namely arranging the terahertz wave receiver 2 at the outer side of the pipe relative to the terahertz wave generator 1, emitting continuous wave terahertz waves to the pipe by the terahertz wave generator 1, reflecting the continuous wave terahertz waves by the inner wall and the outer wall of the pipe in a small amount and absorbing the continuous wave terahertz waves by the pipe in a small amount, receiving the continuous wave terahertz waves transmitted through the pipe by the terahertz wave receiver 2 after penetrating through the pipe, and outputting a direct current voltage signal, so that the problem parts such as pits and bulges of the pipe in the production process can be.
The terahertz wave generator 1 firstly generates continuous wave terahertz waves, such as continuous wave terahertz waves with working frequencies within the range of 300-1000 GHz, through a terahertz wave source 11, outputs the generated continuous wave terahertz waves to a terahertz wave power amplifier 12, performs power amplification processing on the continuous wave terahertz waves through the terahertz wave power amplifier 12, outputs the continuous wave terahertz waves subjected to the power amplification processing to a terahertz wave transmitting antenna 13, and finally transmits the continuous wave terahertz waves to a pipe through the terahertz wave transmitting antenna 13.
Compared with pulse terahertz waves, continuous wave terahertz waves are stronger in penetrating power and lower in power. And because 300-1000 GHz is between microwave (/ millimeter wave) frequency and light wave frequency, compare with microwave (/ millimeter wave) detection, the shorter wavelength makes terahertz wave detect and has higher detection accuracy, can provide the test accuracy of submillimeter level, compare with light wave detection, terahertz wave of longer wavelength can penetrate dielectric material such as plastics, wallboard, clothing, penetrate cigarette, fog, dust, have the characteristic that does not receive flash of light, vapor, temperature, dust etc. influence in the industrial production environment. According to the propagation characteristics of terahertz waves, when the terahertz waves are propagated in space, the terahertz waves can penetrate smoke, fog, dust and the like with low loss, and when the terahertz waves are propagated in dielectric materials such as plastics, most of the terahertz wave energy enters the dielectric materials such as plastics and the like and is transmitted out except that a small part of the terahertz wave energy is reflected/scattered by the surfaces of the plastics.
According to the law of conservation of energy, in the propagation of terahertz waves in dielectric materials such as plastics, the balance condition of incident power is as follows:
Wi＝Wρ+Wα+Wτ； (1)
in the formula (1), WiFor terahertz wave incident power, WρFor reflected power of terahertz waves, WαFor absorbing power for terahertz waves, WτIs terahertz wave transmission power.
Normalization can result in:
in the formula (2), the reaction mixture is,
in order to be the reflectivity,
in order to be able to absorb the water,
is the transmittance.
After the continuous wave terahertz wave is reflected by a small amount of inner and outer walls of the pipe and absorbed by a small amount of the pipe, penetrates through the pipe and is emitted, the terahertz wave receiver 2 firstly receives the continuous wave terahertz wave penetrating through the pipe through the terahertz wave receiving antenna 21, outputs the received continuous wave terahertz wave to the multistage terahertz wave amplifier 22, performs low-noise amplification processing on the continuous wave terahertz wave through the multistage terahertz wave amplifier 22, outputs the continuous wave terahertz wave subjected to the low-noise amplification processing to the terahertz wave detector 23, performs power detection processing on the continuous wave terahertz wave through the terahertz wave detector 23, outputs an obtained direct current voltage signal to the direct current amplifier 24, and finally amplifies the direct current voltage signal through the direct current amplifier 24.
According to the embodiment, the terahertz wave generator 1 and the terahertz wave receiver 2 are respectively arranged at the relative positions of the outer sides of the pipes along the diameters of the pipes, the terahertz wave generator 1 transmits continuous wave terahertz waves to the pipes, the terahertz wave receiver 2 receives the continuous wave terahertz waves transmitted through the pipes and outputs direct current voltage signals, so that the problems of sinking, bulging and the like of the pipes in the production process can be found according to the direct current voltage signals, and the quality of the pipes can be detected. According to the embodiment, the continuous wave terahertz wave is emitted to the pipe by the terahertz wave generator 1, and the influence of production environment factors such as flash, dust, temperature and water vapor can be effectively avoided in the pipe quality detection process by utilizing the propagation characteristics of strong penetrating power and small loss of the continuous wave terahertz wave, so that the detection precision is improved.
As shown in fig. 4, in the preferred embodiment, the terahertz wave generator 1 is arranged on a first rail trolley 9, the terahertz wave receiver 2 is arranged on a second rail trolley 9, and the first rail trolley 9 and the second rail trolley 9 are respectively arranged on opposite positions of an annular rail 10 along the diameter of the annular rail 10 on the outer side of the pipe; the first rail trolley 9 drives the terahertz wave generator 1 to move on the annular rail 10 under the driving of the first walking motor 91, and the second rail trolley 9 drives the terahertz wave receiver 2 to move on the annular rail 10 under the driving of the second walking motor 91.
It should be noted that the circle center of the circular track 10 coincides with the circle center of the cross section of the pipe, and the circular track 10 is not in contact with the outer wall 6 of the pipe.
Illustratively, by arranging a first rail trolley 9 provided with a terahertz wave generator 1 on an annular rail 10 along one end of the diameter of the annular rail 10 outside a pipe, arranging a second rail trolley 9 provided with a terahertz wave receiver 2 on the annular rail 10 along the other end of the diameter of the annular rail 10, namely arranging the second rail trolley 9 on the annular rail 10 relative to the first rail trolley 9, arranging the terahertz wave receiver 2 outside the pipe relative to the terahertz wave generator 1, the terahertz wave generator 1 moves around the pipe on the annular rail 10 under the driving action of the first rail trolley 9 driven by a first traveling motor 91, and simultaneously emits continuous-wave terahertz waves to the pipe, the terahertz wave receiver 2 moves around the pipe on the annular rail 10 under the driving action of the second rail trolley 9 driven by a second traveling motor 91, meanwhile, continuous wave terahertz waves transmitted through the pipe are received, and a direct current voltage signal is output, so that the problems of sinking, bulging and the like of the pipe in the production process can be found according to the direct current voltage signal, and the quality of the pipe can be detected.
In the embodiment, the first rail trolley 9 drives the terahertz wave generator 1 to move around the pipe, the second rail trolley 9 drives the terahertz wave receiver 2 to move around the pipe, the quality of the whole pipe can be detected only by one terahertz wave detection device in the radial movement process of the pipe, the arrangement position of the terahertz wave detection device or the terahertz wave detection device is not required to be additionally arranged, and the detection efficiency is greatly improved.
In the preferred embodiment, the first 9 and second 9 trolleys move clockwise or counterclockwise on the endless track 10 at the same speed.
In the embodiment, the first rail trolley 9 and the second rail trolley 9 move clockwise or anticlockwise on the annular rail 10 at the same speed, so that the terahertz wave generator 1 and the terahertz wave receiver 2 can be always located at the relative position outside the pipe, and the terahertz wave receiver 2 can be ensured to receive continuous wave terahertz waves from the terahertz wave generator 1.
In the preferred embodiment, the wheels of the first 9 and second 9 trolleys are each fastened to the endless track 10.
In the embodiment, the wheels of the first and second rail cars 9 and 9 are fastened to the endless track 10, so that the first and second rail cars 9 and 9 can smoothly travel on the endless track 10.
In a preferred embodiment, a plurality of photosensors 14 are equally spaced on the endless track 10, as shown in figure 4.
As an example, 8 photoelectric sensors 14 are equally spaced on the circular track 10, and the position synchronization state of the first rail trolley 9 and the second rail trolley 9 is monitored and adjusted in real time through the 8 photoelectric sensors 14.
In the embodiment, the plurality of photoelectric sensors 14 on the ring-shaped track 10 are used for monitoring and adjusting the position synchronization state of the first rail trolley 9 and the second rail trolley 9, so that the first rail trolley 9 and the second rail trolley 9 can be always located at the relative positions outside the pipe, that is, the terahertz wave generator 1 and the terahertz wave receiver 2 are always located at the relative positions outside the pipe, and it is ensured that the terahertz wave receiver 2 can receive the continuous wave terahertz wave from the terahertz wave generator 1.
In a preferred embodiment, the continuous wave terahertz wave has an operating frequency of any one of 300 to 1000 GHz.
In the embodiment, the continuous wave terahertz wave with the working frequency within the range of 300-1000 GHz is generated by the terahertz wave source 11, because the frequency of 300-1000 GHz is between the microwave (/ millimeter wave) frequency and the light wave frequency, compared with the detection of the microwave (/ millimeter wave), the detection of the terahertz wave has higher detection precision due to the shorter wavelength, and the sub-millimeter-scale test precision can be provided. According to the propagation characteristics of terahertz waves, when the terahertz waves are propagated in space, the terahertz waves can penetrate smoke, fog, dust and the like with low loss, and when the terahertz waves are propagated in dielectric materials such as plastics, most of the terahertz wave energy enters the dielectric materials such as plastics and the like and is transmitted out except that a small part of the terahertz wave energy is reflected/scattered by the surfaces of the plastics. By utilizing the propagation characteristics of strong penetrating power and small loss of the continuous wave terahertz waves, the influence of production environment factors such as flash, dust, temperature, water vapor and the like can be effectively avoided in the pipe quality detection process, and the detection precision is improved.
In a preferred embodiment, the terahertz wave detection device further comprises a display, and the display is connected with the terahertz wave receiver 2; the display outputs corresponding waveforms according to the direct current voltage signals.
Illustratively, by connecting the display with the terahertz wave receiver 2 and outputting a corresponding waveform by the display according to a direct current voltage signal output by the terahertz wave receiver 2, the problem parts such as pits and bulges of the pipe in the production process can be quickly found, and the detection efficiency is improved.
When the terahertz wave detection device works, if a pipe part meeting the quality standard is scanned, the terahertz wave receiver 2 outputs a stable direct current voltage signal, and the display outputs a stable waveform according to the stable direct current voltage signal; if the concave part 81 which does not meet the quality standard is scanned, the terahertz wave receiver 2 outputs an upward convex direct current voltage signal, and the display outputs a wave crest waveform according to the upward convex direct current voltage signal; if the convex part 82 which does not meet the quality standard is scanned, the terahertz wave receiver 2 outputs a concave direct current voltage signal, and the display outputs a wave trough waveform according to the concave direct current voltage signal. A movement trace diagram of the terahertz wave detection device is shown in fig. 5, and an output waveform diagram of the display is shown in fig. 6.
In a preferred embodiment, the terahertz wave detection device further includes a power supply device that supplies power to the terahertz wave generator 1 and the terahertz wave receiver 2.
Illustratively, by additionally arranging a power supply device, when the terahertz wave generator 1 and the terahertz wave receiver 2 are respectively arranged at opposite positions on the outer side of the pipe along the diameter of the pipe, the power supply device supplies power to the terahertz wave generator 1 and the terahertz wave receiver 2, so that the terahertz wave generator 1 and the terahertz wave receiver 2 can be ensured to work continuously.
In a preferred embodiment, the terahertz wave detection device further includes a power supply device that supplies power to the terahertz wave generator 1, the terahertz wave receiver 2, the first traveling motor 91, and the second traveling motor 91.
Illustratively, by adding a power supply device, when a first rail trolley 9 provided with the terahertz wave generator 1 and a second rail trolley 9 provided with the terahertz wave receiver 2 are respectively arranged on opposite positions of the annular track 10 along the diameter of the annular track 10 on the outer side of the pipe, the power supply device supplies power to the terahertz wave generator 1, the terahertz wave receiver 2, the first walking motor 91 and the second walking motor 91, so that the terahertz wave generator 1, the terahertz wave receiver 2, the first walking motor 91 and the second walking motor 91 are ensured to work continuously.
In a preferred embodiment of this embodiment, the power supply means comprises a brush.
In summary, the embodiment of the present invention has the following advantages:
the embodiment of the invention provides a terahertz wave detection device comprising a terahertz wave generator 1 and a terahertz wave receiver 2, wherein the terahertz wave generator 1 and the terahertz wave receiver 2 are respectively arranged at opposite positions on the outer side of a pipe along the diameter of the pipe, continuous wave terahertz waves are transmitted to the pipe by the terahertz wave generator 1, the continuous wave terahertz waves transmitted through the pipe are received by the terahertz wave receiver 2, and a direct current voltage signal is output, so that the problems of sinking, bulging and the like of the pipe in the production process can be found according to the direct current voltage signal, and the quality of the pipe can be detected. According to the embodiment of the invention, the continuous wave terahertz wave is emitted to the pipe by the terahertz wave generator 1, and the influence of production environment factors such as flash, dust, temperature, water vapor and the like can be effectively avoided in the pipe quality detection process by utilizing the propagation characteristics of strong penetrating power and small loss of the continuous wave terahertz wave, so that the detection precision is improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A terahertz wave detection device is characterized by comprising a terahertz wave generator and a terahertz wave receiver; the terahertz wave generator consists of a terahertz wave source, a terahertz wave power amplifier and a terahertz wave transmitting antenna; the terahertz wave receiver consists of a terahertz wave receiving antenna, a multi-stage terahertz wave amplifier, a terahertz wave detector and a direct current amplifier;
the terahertz wave generator and the terahertz wave receiver are respectively arranged at opposite positions on the outer side of the pipe along the diameter of the pipe;
the terahertz wave generator transmits continuous wave terahertz waves to the pipe, and the terahertz wave receiver receives the continuous wave terahertz waves transmitted through the pipe and outputs direct-current voltage signals.
2. The terahertz wave detection device according to claim 1, wherein the terahertz wave generator is disposed on a first rail trolley, the terahertz wave receiver is disposed on a second rail trolley, and the first rail trolley and the second rail trolley are respectively disposed at opposite positions of an annular rail along a diameter of the annular rail outside the tube;
the first rail trolley drives the terahertz wave generator to move on the annular track under the driving of the first walking motor, and the second rail trolley drives the terahertz wave receiver to move on the annular track under the driving of the second walking motor.
3. The terahertz wave detection device as claimed in claim 2, wherein the first rail car and the second rail car move clockwise or counterclockwise on the ring-shaped rail at the same speed.
4. The terahertz wave detection device of claim 2, wherein wheels of the first and second trolleys are fastened to the endless track.
5. The terahertz-wave detecting device as claimed in claim 2, wherein a plurality of photosensors are disposed on the circular orbit at equal intervals.
6. The terahertz-wave detecting device as claimed in claim 1, wherein the continuous-wave terahertz-wave has an operating frequency of any one of 300 to 1000 GHz.
7. The terahertz-wave detecting device according to claim 1 or 2, further comprising a display connected to the terahertz-wave receiver;
and the display outputs corresponding waveforms according to the direct current voltage signals.
8. The terahertz-wave detecting device according to claim 1, further comprising a power supply device that supplies power to the terahertz-wave generator and the terahertz-wave receiver.
9. The terahertz-wave detecting device according to claim 2, further comprising a power supply device that supplies power to the terahertz-wave generator, the terahertz-wave receiver, the first walking motor, and the second walking motor.
10. The terahertz-wave detecting device as claimed in claim 8 or 9, wherein the power supply device includes a brush.
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