Terahertz spectrum detection liquid sample cell and detection system thereof

Abstract

The utility model discloses a terahertz spectrum detection liquid sample cell which comprises a sample cell body, a liquid detection cavity is formed in the sample cell body, and PE films cover the two sides of the liquid detection cavity. The sample cell detection system comprises a closed box, the sample cell body is mounted in the closed box, and the mounting body is connected with the bottom wall of the closed box. The utility model has the beneficial effects that the molecular structure of the PE film is matched with the frequency of terahertz waves, the absorption of terahertz radiation is smaller, the permeability is better, and the terahertz waves cannot be obviously absorbed, so that the loss of the terahertz waves can be reduced, and the accuracy and precision of the detection result of the water content of the insulating oil are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of insulating oil quality detection, particularly to a terahertz spectrum detection liquid sample cell and detection system thereof. BACKGROUND

[0002] The safe operation of power grid is the basis for ensuring the stable and reliable power supply of the power system, and once collapse or large-area power outage occurs, it will cause huge economic losses and serious social response. Among the known accident types, insulation system accidents account for about 80%. In high-voltage cable terminals, silicon oil is usually filled as an insulating medium, however, under the action of long-term electric heating and environmental factors, the insulating silicon oil will deteriorate and change, thereby affecting the normal operation of the cable. Among them, moisture is one of the important factors affecting the deterioration of silicon oil insulation, therefore, detecting the moisture content of insulating silicon oil to analyze its insulation performance is an important means.

[0003] The terahertz wave band is between infrared and microwave, with a wavelength of 30 μm~3 mm and a frequency of 0.1~10 THz. It can non-destructively, non-toxicly, quickly and accurately detect the water content of insulating oil.

[0004] When detecting the water content of insulating oil by terahertz wave, the traditional method is to make the terahertz wave shoot at the insulating oil in a glass bottle, and then obtain the analysis of the water content of the insulating oil by comparing the original terahertz wave and the transmitted terahertz wave. However, the glass bottle will have a certain impact on the terahertz wave, resulting in poor accuracy and low precision of the detection result. SUMMARY

[0005] The utility model discloses a terahertz spectrum detection liquid sample cell and detection system thereof, which can improve the accuracy and precision of the detection result of the water content of insulating oil.

[0006] The terahertz spectrum detection liquid sample cell, which is characterized by comprising a sample cell body, wherein a liquid detection cavity is opened on the sample cell body, and PE films are covered on both sides of the liquid detection cavity.

[0007] The molecular structure of the PE film matches the frequency of the terahertz wave, the absorption of the terahertz radiation is small, the permeability is good, and the terahertz wave will not be significantly absorbed, so that the terahertz wave loss can be reduced, thereby improving the accuracy and precision of the detection result of the water content of insulating oil.

[0008] Further, the sample cell body is of a thin-wall structure and the cross section is in the shape of "L", the vertical part of the sample cell body is a detection body, the liquid detection cavity is arranged on and penetrates through the detection body, the PE film covers the liquid detection cavity in the center and is tightly attached to the side wall of the detection body at the periphery, and the horizontal part of the sample cell body is a mounting body.

[0009] Further, the material of the sample cell body is metal.

[0010] The metal has strong reflection ability to terahertz waves and is almost unable to penetrate, so the sample cell body is made of metal steel plate, which can effectively detect the measured sample and the experimental data will not be disturbed by other materials.

[0011] The sample cell detection system comprises a closed box, wherein the terahertz spectrum detection liquid sample cell is installed in the closed box, and the installation body is connected with the bottom wall of the closed box.

[0012] During detection, the detection body is located between the terahertz wave emitting device and the terahertz wave receiving device.

[0013] The closed box can prevent external conditions from interfering with the terahertz waves, thereby improving the accuracy and precision of the insulating oil water content detection results.

[0014] Nitrogen gas or other gas is introduced into the closed box to improve the detection environment and greatly improve the detection precision.

[0015] Further, the closed box is provided with a sliding rail fixedly installed on the bottom wall of the closed box, a sliding platform horizontally moving along the sliding rail is installed on the sliding rail, and the installation body is fixed on the sliding platform.

[0016] The sliding platform can adjust the distance between the detection body and the lens in the terahertz wave detection device, thereby adjusting the distance between the liquid to be detected and the lens and improving the detection precision.

[0017] Further, a sample cell installation opening and a strip-shaped groove are formed on the front side wall of the closed box, a closed door is arranged at the sample cell installation opening, and the door leaf of the closed door is connected with the front side wall of the closed box through a hinge.

[0018] The strip-shaped groove is arranged along the length direction of the front side wall of the closed box, and the strip-shaped groove is close to the lower end surface of the closed box.

[0019] A guide column is installed on the sliding platform, and the guide column extends out of the closed box through the strip-shaped groove.

[0020] The closed door not only facilitates the installation of the sample cell body, but also greatly improves the sealing performance of the closed box, thereby improving the accuracy and precision of the insulating oil water content detection results.

[0021] Further, at least one pair of lens mounting shaft through holes are formed on the rear side wall of the closed box, and the centers of all the lens mounting shaft through holes are located on the same straight line.

[0022] Further, one pair of the lens mounting shaft through holes are mirror arranged along the vertical central axis of the rear side wall.

[0023] The light path correction lens is installed in the closed box through the lens mounting shaft through hole, thereby correcting the terahertz wave path, making the terahertz wave pass through the liquid detection cavity, and ensuring the effectiveness and precision of the detection result.

[0024] Further, the left side wall and the right side wall of the closed box are both provided with a terahertz wave via hole, and the centers of the two terahertz wave via holes are located on the same straight line.

[0025] Further, the upper side wall of the closed box is provided with an observation hole.

[0026] Beneficial effect: The molecular structure of the PE film matches the frequency of the terahertz wave, and the absorption of the terahertz radiation is small, and the permeability is good, which will not significantly absorb the terahertz wave, thereby reducing the terahertz wave loss, and improving the accuracy and precision of the detection result of the water content of the insulating oil.

[0027] The sample pool body is a metal steel plate, and the metal has strong reflection ability to the terahertz wave and is almost impossible to penetrate, thereby preventing the sample pool body bottom plate from interfering with the detection result of the water content of the insulating oil, and further improving the accuracy and precision of the detection result of the water content of the insulating oil.

[0028] The closed box can prevent external conditions from interfering with the terahertz wave, thereby improving the accuracy and precision of the detection result of the water content of the insulating oil.

[0029] By moving the sliding platform, the distance between the sample pool body and the terahertz wave emitting device can be adjusted, thereby improving the practicability of the sample pool. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a three-dimensional schematic view of a liquid sample pool for terahertz spectrum detection;

[0031] Figure 2 is a three-dimensional schematic view of a liquid sample pool for terahertz spectrum detection; Figure 1 is an enlarged view of a at the middle;

[0032] Figure 3 is a three-dimensional schematic view of a sample pool detection system;

[0033] Figure 4 is a front view of Figure 3 ;

[0034] Figure 5 is a rear view of Figure 3 ;

[0035] Figure 6 is a left view of Figure 3 ;

[0036] Figure 7 is a right view of Figure 3 ;

[0037] Figure 8 is a top view of Figure 3 ;

[0038] Figure 9 is a sectional view of A-A in Figure 8 . DETAILED DESCRIPTION

[0039] The specific embodiments of the utility model and working principle are further described in detail below in combination with the drawings.

[0040] As shown in Figure 1 , a terahertz spectrum detection liquid sample cell includes a sample cell body 2 in a thin-walled structure, which is made of a metal steel plate, and the cross section of the sample cell body 2 is in the shape of "L";

[0041] The vertical part of the sample cell body 2 is a detection body 21, and a liquid detection cavity 211 penetrating through the detection body 21 is formed on the detection body 21;

[0042] As shown in Figure 2 , both sides of the liquid detection cavity 211 are covered with a PE film 3, which is a polyethylene film, the PE film 3 covers the liquid detection cavity 211 in the center, and the outer periphery is tightly attached to the side wall of the detection body 21;

[0043] The horizontal part of the sample cell body 2 is a mounting body 22.

[0044] As shown in Figure 3 , Figure 9 , a sample cell detection system includes an enclosed box 1, a sliding rail 16 is arranged in the enclosed box 1, the sliding rail 16 is fixedly installed on the bottom wall of the enclosed box 1, and is parallel to the long side of the bottom wall of the enclosed box 1.

[0045] The sliding rail 16 is installed with a sliding platform 17 moving horizontally along the sliding rail 16, and a terahertz spectrum detection liquid sample cell is installed on the sliding platform 17, the mounting body 22 of the terahertz spectrum detection liquid sample cell is fixed on the sliding platform 17, and the detection body 21 of the terahertz spectrum detection liquid sample cell is perpendicular to the bottom wall of the enclosed box 1.

[0046] As shown in Figure 3 , Figure 4 , a sample cell mounting port 11 and a strip-shaped groove 12 are formed on the front side wall of the enclosed box 1, the sample cell mounting port 11 is located above the strip-shaped groove 12, and the vertical central axes of the two coincide;

[0047] The sample cell mounting port 11 is provided with a closure door 111, which is a double door, and the two door leaves are connected to the front side wall of the closure door 111 through hinges 112;

[0048] The strip-shaped groove 12 is arranged along the length direction of the front side wall of the closure box 1, and is close to the lower end surface of the closure box 1;

[0049] The sliding platform 17 is provided with a guide column 171 on one side facing the strip-shaped groove 12, which extends out of the closure box 1 through the strip-shaped groove 12.

[0050] As shown in Figure 5 , Figure 9 Three pairs of lens mounting shaft through holes 15 are opened on the rear side wall of the closure box 1, each pair of lens mounting shaft through holes 15 is mirror arranged along the vertical central axis of the rear side wall, and the centers of all the lens mounting shaft through holes 15 are located on the same straight line.

[0051] As shown in Figure 6 , Figure 7 Terahertz wave through holes 13 are opened on the left and right side walls of the closure box 1, and the centers of the two terahertz wave through holes 13 are located on the same straight line.

[0052] As shown in Figure 8 , An observation hole 14 is opened on the upper side wall of the closure box 1.

[0053] When detecting the water content of insulating oil, first, the PE film 3 is covered on one side of the detection body 21, and the insulating oil is dropped into the liquid detection cavity 211, then the PE film 3 is covered on the other side of the detection body 21, so that the insulating oil is sandwiched between the two layers of PE film 3 and located in the liquid detection cavity 211.

[0054] Then, the sample cell body 2 is put into the closure box 1 through the sample cell mounting port 11, and the mounting body 22 is fixed on the sliding platform 17, so that the detection body 21 is located between the two terahertz wave through holes 13.

[0055] Then, three pairs of optical path correction lenses are inserted into the closure box 1 through the lens mounting shaft through holes 15, so that the three pairs of optical path correction lenses are uniformly distributed on both sides of the detection body 21, and then the terahertz wave emitting device and the terahertz wave receiving device are respectively aligned with the two terahertz wave through holes 13, the angle of the optical path correction lens is adjusted, and the distance between the detection body 21 and the optical path correction lens is adjusted through the guide column 171, so that the terahertz wave emitted by the terahertz wave emitting device is emitted to the terahertz wave receiving device through the liquid detection cavity 211.

Claims

1. A terahertz spectroscopic detection liquid sample cell, characterized by, The sample cell body (2) is provided with a liquid detection cavity (211), and the two sides of the liquid detection cavity (211) are covered with a PE film (3); The sample cell body (2) is of a thin-walled structure and has an "L"-shaped cross section, the vertical part of the sample cell body (2) is a detection body (21), the liquid detection cavity (211) is arranged on the detection body (21) and penetrates the detection body (21), the PE film (3) covers the liquid detection cavity (211) in the center and is tightly attached to the side wall of the detection body (21) in the periphery, and the horizontal part of the sample cell body (2) is a mounting body (22).

2. The terahertz spectroscopic detection liquid sample cell according to claim 1, characterized in that, The sample cell body (2) is made of metal.

3. A cuvette detection system characterized by, The closed box (1) is provided with a terahertz spectrum detection liquid sample cell as claimed in any one of claims 1-2, and the mounting body (22) is connected to the bottom wall of the closed box (1).

4. The cell detection system of claim 3, wherein, The closed box (1) is provided with a slide rail (16) fixedly installed on the bottom wall of the closed box (1), the slide rail (16) is provided with a sliding platform (17) horizontally moving along the slide rail (16), and the mounting body (22) is fixed on the sliding platform (17).

5. The cell detection system of claim 4, wherein, The front side wall of the closed box (1) is provided with a sample cell mounting port (11) and a strip-shaped groove (12), the sample cell mounting port (11) is provided with a closing door (111), the door leaf of the closing door (111) is connected to the front side wall of the closed box (1) through a hinge (112); The strip-shaped groove (12) is arranged along the length direction of the front side wall of the closed box (1), and the strip-shaped groove (12) is close to the lower end surface of the closed box (1); The sliding platform (17) is provided with a guide column (171) extending out of the closed box (1) through the strip-shaped groove (12).

6. The cell detection system of claim 3, wherein, The rear side wall of the closed box (1) is provided with at least one pair of lens mounting shaft through holes (15), and the centers of all the lens mounting shaft through holes (15) are located on the same straight line.

7. The cell detection system of claim 6, wherein, The lens mounting shaft through holes (15) are arranged in mirror image along the vertical central axis of the rear side wall.

8. The cell detection system of claim 3, wherein, The left side wall and the right side wall of the closed box (1) are provided with terahertz wave through holes (13), and the centers of the two terahertz wave through holes (13) are located on the same straight line.

9. The cell detection system of claim 3, wherein, The upper side wall of the closed box (1) is provided with an observation hole (14).

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