Prism module

Abstract

The utility model discloses a prism module, which comprises a first transparent prism, a second transparent prism, a third transparent prism and a fourth transparent prism, the cross section shapes of the first transparent prism, the second transparent prism, the third transparent prism and the fourth transparent prism along the length direction are identical isosceles right triangles, and the first right-angle surface of the first transparent prism is spliced with the third right-angle surface of the second transparent prism. A first filter film is arranged between the two; a second filtering film is arranged between the second right-angle surface of the first transparent prism and the fifth right-angle surface of the third transparent prism; a third filter film is arranged between the fourth right-angle surface of the second transparent prism and the seventh right-angle surface of the fourth transparent prism; and a fourth filter film is arranged between the sixth right-angle surface of the third transparent prism and the eighth right-angle surface of the fourth transparent prism. The four transparent prisms are coated and glued together, so that the structure is simple, and the integration level is high; and the reliability and the anti-interference capability of the system can be greatly improved, and an extremely high signal-to-noise ratio is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a prism, in particular to a prism module. BACKGROUND

[0002] At present, the laser welding defect detection technology realizes the identification of welding defects by monitoring light signals, sound signals, electric signals, heat signals and visual signals in the welding process. Among them, the detection method based on light signal and optical sensing technology is the most mature, which has realized commercial production and is widely used. The technology captures the optical characteristic signals such as plasma signal, back reflection laser signal and infrared thermal radiation signal, and carries out photoelectric conversion to distinguish normal signals and defect signals, realize the accurate and rapid identification and classification of different types of welding defects, and ensure the stable and efficient operation of the laser welding system.

[0003] However, the existing detection equipment based on light signal sensing technology usually uses multiple optical spectrometers and filter groups to distinguish different spectral signals. This multi-lens solution has many problems

[0004] 1) High cost and complex design: a large number of lenses and filters result in high system cost and extremely complex optical design.

[0005] 2) Low precision and poor reliability: the lens installation precision is high, any deviation will affect the accuracy of the detection result, and the system is easily disturbed by environmental vibration, so the reliability is low.

[0006] 3) Large volume and limited application: the huge optical system limits its application in narrow space or complex working conditions, and it is difficult to meet the needs of modern industry for compact and high reliability detection equipment. SUMMARY

[0007] To solve the above problems, the present application provides a prism module, which is composed of four transparent prisms coated and glued together, with simple structure, good reliability, high integration and small volume.

[0008] The utility model provides the following technical scheme:

[0009] A prism module, comprising a first transparent prism, a second transparent prism, a third transparent prism and a fourth transparent prism, which are all isosceles right triangles in cross-sectional shape along the length direction, the first right angle face of the first transparent prism is combined with the third right angle face of the second transparent prism, and the first filter film is arranged between them; the second right angle face of the first transparent prism is combined with the fifth right angle face of the third transparent prism, and the second filter film is arranged between them; the fourth right angle face of the second transparent prism is combined with the seventh right angle face of the fourth transparent prism, and the third filter film is arranged between them; and the sixth right angle face of the third transparent prism is combined with the eighth right angle face of the fourth transparent prism, and the fourth filter film is arranged between them.

[0010] Further, the hypotenuse of the second transparent prism has a fifth filter film.

[0011] Further, the hypotenuse of the third transparent prism has a sixth filter film.

[0012] Further, the hypotenuse of the fourth transparent prism has a seventh filter film.

[0013] Further, the first filter film, the second filter film, the second filter film, the third filter film and the fourth filter film are dichroic filter films.

[0014] Further, the fifth filter film is a band-pass filter film.

[0015] Further, the sixth filter film is a band-pass filter film.

[0016] Further, the seventh filter film is a band-pass filter film.

[0017] The beneficial effects of the present application are as follows:

[0018] By coating and gluing the four transparent prisms together, the structure is simple, the integration degree is high, the overall size can be made below 5cm, the narrow environment working condition is convenient, the light splitting path composed of a single prism module can greatly improve the reliability and anti-interference ability of the system, and a very high signal-to-noise ratio (>100000:1) is realized. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 is the overall structure diagram of the present application;

[0020] Fig. 2 is the overall structure diagram of the present application;

[0021] Fig. 3 is the light path schematic diagram of the present application;

[0022] Wherein, the first transparent prism 1, the first right angle surface 1-1, the second right angle surface 1-2, the second transparent prism 2, the third right angle surface 2-1, the fourth right angle surface 2-2, the third transparent prism 3, the fifth right angle surface 3-1, the sixth right angle surface 3-2, the fourth transparent prism 4, the seventh right angle surface 4-1, the eighth right angle surface 4-2, the first filter film 5, the second filter film 6, the third filter film 7, the fourth filter film 8, the fifth filter film 2-3, the sixth filter film 3-3, the seventh filter film 4-3. DETAILED DESCRIPTION

[0023] In order to further illustrate the technical means and effects taken by the utility model to achieve the predetermined utility model purposes, the following will be described in detail in combination with the drawings and preferred embodiments, the specific embodiments, structure, features and effects according to the utility model.

[0024] In the application, the materials of the first transparent prism 1, the second transparent prism 2, the third transparent prism 3 and the fourth transparent prism 4 are colorless optical glass materials with high transmittance in the visible light and near-infrared wave bands, such as common H-K9L, N-BK7, fused quartz glass materials and the like, so as to realize as small signal light absorption attenuation as possible.

[0025] The utility model embodiments will be further described in the following multiple embodiments.

[0026] Embodiment 1

[0027] As Figs. 1-3 A prism module, comprising first transparent prism 1, second transparent prism 2, third transparent prism 3 and fourth transparent prism 4, the cross-sectional shape of which is isosceles right triangle along the length direction, the first right angle surface 1-1 of the first transparent prism 1 is spliced with the third right angle surface 2-1 of the second transparent prism 2, and the first filter film 5 is arranged between the two; the second right angle surface 1-2 of the first transparent prism 1 is spliced with the fifth right angle surface 3-1 of the third transparent prism 3, and the second filter film 6 is arranged between the two; the fourth right angle surface 2-2 of the second transparent prism 2 is spliced with the seventh right angle surface 4-1 of the fourth transparent prism 4, and the third filter film 7 is arranged between the two; the sixth right angle surface 3-2 of the third transparent prism 3 is spliced with the eighth right angle surface 4-2 of the fourth transparent prism 4, and the fourth filter film 8 is arranged between the two.

[0028] The cross section of the transparent prism is an isosceles right triangle prism, in the embodiment, the cross-sectional oblique edge length of the first transparent prism 1, the second transparent prism 2, the third transparent prism 3 and the fourth transparent prism 4 is 25.4mm, so that the overall sensor light, machine and electrical overall size is less than 5cm.

[0029] The first filter film 5 is a dichroic filter film, which has high reflectivity to the visible light wave band (400~700nm), high transmittance to the back reflection laser wave band (1000~1100nm) and the near-infrared wave band (1200nm~1700nm).

[0030] The second filter film 6 is a dichroic filter film, which has high transmittance to the back reflection laser wave band (1000~1100nm), high transmittance to the visible light wave band (400~700nm) and the near-infrared wave band (1200nm~1700nm).

[0031] The third filter film 7 is a dichroic filter film, and has a film system with high reflectivity to a visible light band (400-700 nm) and high transmissivity to a back-reflection laser band (1000-1100 nm) and a near-infrared band (1200 nm-1700 nm).

[0032] The fourth filter film 8 is a dichroic filter film, and has a film system with high transmissivity to a back-reflection laser band (1000-1100 nm) and high transmissivity to a visible light band (400-700 nm) and a near-infrared band (1200 nm-1700 nm).

[0033] The fifth filter film 9 is a band-pass filter film, and has a film system with high transmissivity to a visible light band (400-700 nm) and high cut-off rate to a back-reflection laser band (1000-1100 nm) and a near-infrared band (1200 nm-1700 nm).

[0034] The sixth filter film 10 is a band-pass filter film, and has a film system with high transmissivity to a back-reflection laser band (1000-1100 nm) and high cut-off rate to a visible light band (400-700 nm) and a near-infrared band (1200 nm-1700 nm).

[0035] The seventh filter film 11 is a band-pass filter film, and has a film system with high transmissivity to a near-infrared band (1200 nm-1700 nm) and high cut-off rate to a visible light band (400-700 nm) and a back-reflection laser band (1000-1100 nm).

[0036] The module can be used in a laser welding defect monitoring system with a laser wavelength of 1064 nm or 1080 nm.

[0037] The performance of the prism module is tested, and the specific process is as follows:

[0038] Test system:

[0039] 1. Test light source: 10 mW of 532 nm laser A, 1064 nm laser B, and 1550 nm laser C each;

[0040] 2. Optical power meter: laser power meter probe D with a wavelength range of 400-1100 nm; laser power meter probe E with a wavelength range of 700-1800 nm;

[0041] 3. Optical darkroom 1;

[0042] Test Method: The experimental setup was arranged in an optical darkroom to eliminate ambient light and other light interference. Lasers A, B, and C were used to output a laser power of 10mW. The lasers were sequentially incident from the inclined surface of the first transparent prism 1. The laser power was measured using a laser power meter probe D on one side of the inclined surface of the second transparent prism 2 and the third transparent prism 3, respectively. The power was measured using a laser power meter probe E on one side of the inclined surface of the fourth transparent prism 4. The results were recorded as A1, A2, A3, B1, B2, B3, C1, C2, and C3, respectively. The signal-to-noise ratio of each path was calculated as A1 / (B1+C1), A2 / (B2+C2), and A3 / (B3+C3).

[0043] Test results:

[0044] A1=9.96mW, A2=0.000001mW, A3=0.000002mW;

[0045] B1=0.000002mW, B2=9.95mW, B3=0.000001mW;

[0046] C1 = 0.000002mW, C2 = 0.000003mW, C3 = 9.85mW; Calculate the signal-to-noise ratio for each channel:

[0047] A1 / (B1+C1)=2490000:1>1000000:1;

[0048] A2 / (B2+C2)=2485000:1>1000000:1;

[0049] A3 / (B3+C3)=3283333:1>1000000:1;

[0050] Therefore, it can be seen that the entire system using the prism module of this application has an excellent signal-to-noise ratio.

[0051] Example 2

[0052] A prism module includes a first transparent prism 1, a second transparent prism 2, a third transparent prism 3, and a fourth transparent prism 4, all of which have the same cross-sectional shape of isosceles right triangles along their length. The first right-angled surface 1-1 of the first transparent prism 1 is joined with the third right-angled surface 2-1 of the second transparent prism 2, with a first filter film 5 between them; the second right-angled surface 1-2 of the first transparent prism 1 is joined with the fifth right-angled surface 3-1 of the third transparent prism 3, with a second filter film 6 between them; the fourth right-angled surface 2-2 of the second transparent prism 2 is joined with the seventh right-angled surface 4-1 of the fourth transparent prism 4, with a third filter film 7 between them; and the sixth right-angled surface 3-2 of the third transparent prism 3 is joined with the eighth right-angled surface 4-2 of the fourth transparent prism 4, with a fourth filter film 8 between them.

[0053] The cross section of the transparent prism is an isosceles right triangle prism, and in the embodiment, the cross section of the first transparent prism 1, the second transparent prism 2, the third transparent prism 3 and the fourth transparent prism 4 is an isosceles right triangle with a hypotenuse of 25.4 cm, so that the overall sensor optical, mechanical and electrical dimensions are less than 5 cm.

[0054] The first filter film 5 is a dichroic filter film, and is a film system with high reflectivity to the visible light band (400-500 nm, 550-700 nm) and high transmittance to the back-reflection laser band (500-550 nm) and the near-infrared band (1200 nm-1700 nm).

[0055] The second filter film 6 is a dichroic filter film, and is a film system with high transmittance to the back-reflection laser band (500-550 nm) and high transmittance to the visible light band (400-500 nm, 550-700 nm) and the near-infrared band (1200 nm-1700 nm).

[0056] The third filter film 7 is a dichroic filter film, and is a film system with high reflectivity to the visible light band (400-500 nm, 550-700 nm) and high transmittance to the back-reflection laser band (500-550 nm) and the near-infrared band (1200 nm-1700 nm).

[0057] The fourth filter film 8 is a dichroic filter film, and is a film system with high transmittance to the back-reflection laser band (500-550 nm) and high transmittance to the visible light band (400-500 nm, 550-700 nm) and the near-infrared band (1200 nm-1700 nm).

[0058] The fifth filter film 9 is a band-pass filter film, and is a film system with high transmittance to the visible light band (400-500 nm, 550-700 nm) and high cut-off rate to the back-reflection laser band (500-550 nm) and the near-infrared band (1200 nm-1700 nm).

[0059] The sixth filter film 10 is a band-pass filter film, and is a film system with high transmittance to the back-reflection laser band (500-550 nm) and high cut-off rate to the visible light band (400-500 nm, 550-700 nm) and the near-infrared band (1200 nm-1700 nm).

[0060] The seventh filter film 11 is a band-pass filter film, and is a film system with high transmittance to the near-infrared band (1200 nm-1700 nm) and high cut-off rate to the visible light band (400-500 nm, 550-700 nm) and the back-reflection laser band (500-550 nm).

[0061] The module can be used in laser welding defect monitoring system with laser wavelength of 515nm and 532nm.

[0062] The performance of the prism module is tested as follows:

[0063] Test system:

[0064] 1. Test light source: 10mW of 532nm laser A, 1064nm laser B, and 1550nm laser C;

[0065] 2. Optical power meter: laser power meter probe D with wavelength range of 400-1100nm; laser power meter probe E with wavelength range of 700-1800nm;

[0066] 3. Optical darkroom 1;

[0067] Test method: arrange the experimental device in the optical darkroom to exclude environmental light and other light interference. Use laser A, laser B, and laser C to make the output laser power 10mW, and sequentially inject from the hypotenuse of the first transparent prism 1, and detect the optical power on the hypotenuse side of the second transparent prism 2 and the third transparent prism 3 with laser power meter probe D, and detect the power on the hypotenuse side of the fourth transparent prism 4 with laser power meter probe E. The results are recorded as A1, A2, A3, B1, B2, B3, C1, C2, and C3 respectively. The signal-to-noise ratio of each path is calculated as A1 / (B1+C1), A2 / (B2+C2), and A3 / (B3+C3).

[0068] Test results:

[0069] A1=9.89mW, A2=0.000003mW, and A3=0.000002mW;

[0070] B1=0.000001mW, B2=9.93mW, and B3=0.000003mW;

[0071] C1=0.000003mW, C2=0.000001mW, and C3=9.91mW; through calculation, the signal-to-noise ratio of each path is calculated as follows:

[0072] A1 / (B1+C1)=2472500:1>1000000:1;

[0073] A2 / (B2+C2)=2482500:1>1000000:1;

[0074] A3 / (B3+C3)=1982000:1>1000000:1;

[0075] Therefore, the entire system using the prism module has excellent signal-to-noise ratio.

[0076] The prism module is composed of four transparent prisms which are coated and glued together, has simple structure, high integration, and overall size less than 5cm, is convenient for use in narrow environment, and has a single prism module to form a light splitting path, which greatly improves the reliability and anti-interference ability of the system, and achieves very high signal-to-noise ratio (>100000:1).

[0077] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change and modification of the above embodiments, which does not depart from the technical solution of the present application, is still within the scope of the technical solution of the present application.

Claims

1. A prism module, characterized by, The first transparent prism, the second transparent prism, the third transparent prism and the fourth transparent prism all have the same isosceles right triangle shape in the length direction, the first right angle surface of the first transparent prism and the third right angle surface of the second transparent prism are combined, and the first filter film is arranged between the two; the second right angle surface of the first transparent prism and the fifth right angle surface of the third transparent prism are combined, and the second filter film is arranged between the two; the fourth right angle surface of the second transparent prism and the seventh right angle surface of the fourth transparent prism are combined, and the third filter film is arranged between the two; the sixth right angle surface of the third transparent prism and the eighth right angle surface of the fourth transparent prism are combined, and the fourth filter film is arranged between the two.

2. The prism module according to claim 1, characterized by The surface of the oblique side of the second transparent prism has a fifth filter film.

3. The prism module of claim 1, wherein, The surface of the oblique side of the third transparent prism has a sixth filter film.

4. The prism module of claim 1, wherein, The surface of the oblique side of the fourth transparent prism has a seventh filter film.

5. The prism module of claim 1, wherein, The first filter film, the second filter film, the third filter film and the fourth filter film are dichroic filter films.

6. The prism module of claim 2, wherein, The fifth filter film is a band-pass filter film.

7. The prism module of claim 3, wherein, The sixth filter film is a band-pass filter film.

8. The prism module of claim 4, wherein, The seventh filter film is a band-pass filter film.

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