Coal quality analysis optical transceiver and calibration method thereof

Abstract

The present application provides a coal quality analysis light transceiver device and a calibration method thereof. The coal quality analysis light transceiver device comprises a first housing, a support frame, a light source mechanism, a window sheet and a recovery probe. The first housing comprises a top plate and a bottom plate and is in a hollow structure. The support frame is fixed on the bottom plate and is used for supporting the light source mechanism and the recovery probe. The light source mechanism and the recovery probe are both arranged obliquely relative to the window sheet. The window sheet is embedded in the bottom plate. The light emitted by the light source mechanism is irradiated on a coal sample after passing through the window sheet. The reflected light of the coal sample is outputted outward after converging by the recovery probe after passing through the window sheet. The present application expands the recovery range of the reflected light of the coal sample and improves the light intensity.

Description

Technical Field

[0001] This invention relates to the field of coal quality analysis technology, specifically to a coal quality analysis optical transceiver device and its calibration method. Background Technology

[0002] Coal is widely used as fuel in various industries. Coal quality indicators include moisture, ash, volatile matter, total sulfur, total moisture, and calorific value. Different coal qualities result in different prices and applications, thus requiring coal quality analysis.

[0003] Current coal quality analysis techniques involve on-site sampling and manual sample preparation and testing in the laboratory, which is time-consuming and inefficient.

[0004] Near-infrared spectroscopy, as a rapid and non-destructive testing technique, is gaining increasing attention in many fields. Current coal quality analysis methods involve first extracting coal powder for sample preparation, then generating the coal sample's spectrum using a near-infrared spectrometer in the laboratory, followed by computer-based analysis of the spectrum. Existing near-infrared spectrometers have the following main drawbacks:

[0005] First, existing near-infrared spectrometers cannot perform online analysis of pulverized coal;

[0006] Second, in the near-infrared spectrometer, the light emitted by the light source is absorbed by the sample, and the remaining reflected light enters the monochromator through the optical fiber for spectral diffraction. The diffracted light is then converted into a spectrum by a detector such as a CCD. The light source, monochromator, and detector are integrated into one unit, and their relative positions are fixed and cannot be adjusted.

[0007] Third, the light source of a near-infrared spectrometer illuminates the sample vertically, and much of the reflected light from the sample returns to the light source, resulting in less reflected light entering the optical fiber.

[0008] Application number "201610574583.8" and invention title "Online Analysis Method and Apparatus for Coal Powder" discloses an online analysis method for coal powder. However, the light source and detection probe of this patent application are set up separately. The light source is easily affected by dust, which affects the stability of the light irradiating the coal sample. In addition, the use of two light sources to irradiate the coal sample from different angles results in the light spots detected by the detection probe not completely overlapping or even partially not overlapping. The light intensity of the overlapping and non-overlapping parts is different, which affects the accuracy of coal quality analysis. Summary of the Invention

[0009] To address one or more of the problems existing in the prior art, the present invention provides a light transceiver device for coal quality analysis, comprising a first housing, a support frame, a light source mechanism, a window, and a recovery probe. The first housing includes a top plate and a bottom plate and has a hollow structure. The support frame is fixed to the bottom plate and supports the light source mechanism and the recovery probe. Both the light source mechanism and the recovery probe are inclined relative to the window. The window is embedded in the bottom plate. The light emitted by the light source mechanism illuminates the coal sample after passing through the window. The reflected light from the coal sample passes through the window and is converged by the recovery probe before being output outward. The tilt angle of the light source mechanism relative to the window is set to prevent the reflected light from the coal sample from returning to the light source mechanism after passing through the window. The tilt angle of the recovery probe relative to the window is set to ensure that the reflected light from the coal sample transmitted through the window overlaps in the light spot within the recovery probe.

[0010] According to one aspect of the invention, the height of the support frame is set such that the illumination spot of the light source mechanism on the coal sample coincides with the collection spot of the recovery probe on the coal sample.

[0011] According to one aspect of the invention, a reference plate is also included, which is disposed between the support frame and the base plate and is coaxially arranged with the window slab.

[0012] According to one aspect of the invention, the height of the support frame is set such that the illumination spot of the light source mechanism on the reference plate overlaps with the collection spot of the recovery probe on the reference plate, and the illumination spot of the light source mechanism on the coal sample coincides with the collection spot of the recovery probe on the coal sample.

[0013] According to one aspect of the present invention, the light source mechanism includes a second housing, and a light source support, a reflector support, a collimating lens support, a light source, a reflector, and a collimating lens, all fixedly connected to the second housing. The light source support supports the light source, the reflector support fixes the reflector, the reflector converges the light emitted by the light source to the collimating lens, the collimating lens support supports the collimating lens, and the collimating lens converts the converged light beam into a parallel light beam.

[0014] According to one aspect of the present invention, the light source mechanism further includes a focal length adjustment mechanism for adjusting the distance between the light source and the first collimating lens, so that the light emitted by the light source is converted into a parallel beam after passing through the collimating lens.

[0015] According to one aspect of the present invention, the focus adjustment mechanism includes a lamp holder and a screw, the light source support is annular in structure, the lamp holder is disposed inside the light source support, the lamp holder is threadedly connected to the screw, one end of the screw is rotatably connected to the light source support, and the other end of the screw passes through the lamp holder and is rotatably connected to the reflector support. The lamp holder moves closer to or further away from the collimating lens by rotating the screw clockwise or counterclockwise.

[0016] Preferably, one end of the screw extends out of the light source support and is equipped with a knob.

[0017] According to one aspect of the invention, a cooling mechanism is further included for cooling the light source mechanism.

[0018] According to one aspect of the present invention, the cooling mechanism includes a cooling support base, which is fixedly connected to the light source support base. The cooling support base is provided with an air inlet and an exhaust outlet. The cooling support base is annular, and a hollow cavity is formed between its outer wall and inner wall. The air inlet and exhaust outlet are both connected to the hollow cavity of the cooling support base, and the hollow cavity forms a circulating air cooling channel. A hollow cavity is also formed between the outer wall and inner wall of the light source support base. A plurality of through holes are provided on the bottom surface of the cooling support base, and the through holes are connected to the hollow cavity of the light source support base.

[0019] According to one aspect of the present invention, the outer wall and the inner wall of the reflector cup support are also a hollow cavity, and a plurality of through holes are provided on the bottom surface of the light source support, the through holes communicating with the reflector cup support.

[0020] According to one aspect of the invention, the exhaust connector is disposed on the reflector cup support and communicates with the reflector cup support.

[0021] According to one aspect of the present invention, the recovery probe includes a first converging lens, a light tube, and a second converging lens, wherein the first converging lens is used to converge reflected light from the sample passing through the window into the light tube, and the second converging lens is used to converge the light in the light tube into an outwardly transmitting light transmission device.

[0022] According to one aspect of the invention, it further includes a probe support base, the probe support base including a base and a rotating base, one end of the base being fixed to a support frame, the other end of the base being rotatably connected to one end of the rotating base, and the other end of the rotating base being fixedly connected to a retrieval probe.

[0023] According to a second aspect of the present invention, a calibration method for the above-described optical transceiver for coal quality analysis is provided, comprising:

[0024] Light is shone onto the standard substance through a light source mechanism;

[0025] By adjusting the tilt angle of the light source mechanism, the spectra of standard substances at different tilt angles can be obtained;

[0026] By comparing the above spectrum with the standard spectrum of the standard substance, the tilt angle corresponding to the spectrum with the most similar absorbance characteristic peak shape is taken as the optimal tilt angle of the light source mechanism.

[0027] Adjust the tilt angle of the recovery probe to obtain the signal-to-noise ratio of the spectrum of the standard material at different tilt angles;

[0028] The tilt angle corresponding to the highest signal-to-noise ratio is taken as the optimal tilt angle for retrieval probe.

[0029] The optical transceiver for coal quality analysis described in this invention is independent of the monochromator or interferometer used to generate the spectrum. In different applications, the optical transceiver can be connected to a monochromator or interferometer. Furthermore, the optical transceiver can be positioned above the coal sample on the conveyor belt to achieve continuous online acquisition of the coal sample. The monochromator or interferometer can be connected to the optical transceiver via optical fiber, kept away from the coal sample, to prevent dust from affecting the interference.

[0030] This invention employs a single light source built into the optical transceiver device for coal quality analysis, which prevents dust from contaminating the light source while ensuring its stability.

[0031] This invention improves the stability of the light source by cooling the light source through a cooling mechanism.

[0032] The light source mechanism of this invention is tilted relative to the window to prevent the reflected light from the coal sample from returning to the light source mechanism after passing through the window. This allows the recovery probe to recover almost all the reflected light from the coal sample, expanding the recovery range of the reflected light from the coal sample. The recovery probe of this invention is also tilted relative to the window, so that the reflected light from the coal sample overlaps within the recovery probe after passing through the window, increasing the light intensity and preventing the partial overlap and non-overlap of light spots from affecting the light intensity of the coal sample spectrum, thereby improving the accuracy of coal sample analysis. Attached Figure Description

[0033] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0034] Figure 1 This is a three-dimensional schematic diagram of the optical transceiver device for coal quality analysis of the present invention;

[0035] Figure 2 This is a schematic diagram of the internal structure of the optical transceiver for coal quality analysis described in this invention;

[0036] Figure 3 This is a three-dimensional schematic diagram of the light source mechanism described in this invention;

[0037] Figure 4 This is an exploded view of the light source mechanism of the present invention;

[0038] Figure 5 This is a half-sectional schematic diagram of the light source mechanism described in this invention;

[0039] Figure 6This is a three-dimensional schematic diagram of the recovery probe described in this invention;

[0040] Figure 7 This is a half-sectional schematic diagram of the recovery probe described in this invention;

[0041] Figure 8 This is a three-dimensional schematic diagram of the probe support base described in this invention;

[0042] The components include: first outer shell 1, top plate 11, bottom plate 12, support frame 2, light source mechanism 3, second outer shell 31, light source support 32, reflector support 33, collimating lens support 34, light source 35, reflector 36, collimating lens 37, focus adjustment mechanism 38, lamp holder 381, screw 382, ​​knob 383, cooling mechanism 39, cooling support 391, air inlet connector 392, through hole 393, exhaust connector 394, window 4, recovery probe 5, first converging lens 51, light tube 52, second converging lens 53, probe support 6, base 61, and rotating seat 62. Detailed Implementation

[0043] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0044] The following disclosure provides many different implementations or examples for carrying out different structures of the present invention. Of course, these are merely examples and are not intended to limit the invention. Preferred embodiments of the invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the invention.

[0045] Figure 1 This is a three-dimensional schematic diagram of the optical transceiver device for coal quality analysis of the present invention. Figure 2 This is a schematic diagram of the internal structure of the optical transceiver for coal quality analysis described in this invention, as shown below. Figure 1 and Figure 2 As shown, the coal quality analysis optical transceiver includes a first outer shell 1, a support frame 2, a light source mechanism 3, a window 4, and a recovery probe 5. The first outer shell 1 includes a top plate 11 and a bottom plate 12 and has a hollow structure. The support frame 2 is fixed on the bottom plate 12 and is used to support the light source mechanism 3 and the recovery probe 5. The light source mechanism 3 and the recovery probe 5 are both inclined relative to the window 4. The window 4 is embedded in the bottom plate 12. The light emitted by the light source mechanism 3 shines on the coal sample after passing through the window 4. The reflected light from the coal sample passes through the window 4 and is converged by the recovery probe 5 before being output outward.

[0046] Preferably, the tilt angle of the light source mechanism 3 relative to the window 4 is set to prevent the reflected light from the coal sample from returning to the light source mechanism 3 after passing through the window 4, and the tilt angle of the recovery probe 5 relative to the window 4 is set to make the reflected light from the coal sample transmitted through the window 4 overlap in the light spot of the recovery probe 5.

[0047] like Figure 2 As shown, the height of the support frame 2 is set such that the illumination spot of the light source mechanism 3 on the coal sample coincides with the collection spot of the recovery probe 5 on the coal sample.

[0048] In one embodiment, a reference plate (not shown) is also included, which is disposed between the support frame 2 and the base plate 12 and is coaxially arranged with the window slab 4.

[0049] Preferably, the height of the support frame 2 is set such that the illumination spot of the light source mechanism 3 on the reference plate overlaps with the collection spot of the recovery probe 5 on the reference plate, and the illumination spot of the light source mechanism 3 on the coal sample coincides with the collection spot of the recovery probe 5 on the coal sample. This ensures both the intensity of the dark current collected from the reference plate for spectral absorbance analysis and the intensity of the light spot collected from the recovery probe 5 for monochromator or interferometer.

[0050] Figure 3 This is a three-dimensional schematic diagram of the light source mechanism 3 described in this invention. Figure 4 This is an exploded view of the light source mechanism 3 of the present invention. Figure 5 This is a half-sectional schematic diagram of the light source mechanism 3 described in this invention, as shown below. Figure 3 , Figure 4 and Figure 5 As shown, the light source mechanism 3 includes a second housing 31, and a light source support 32, a reflector support 33, a collimating lens support 34, a light source 35, a reflector 36, and a collimating lens 37, which are fixedly connected to the second housing 31. The light source support 32 is used to support the light source 35, the reflector support 33 is used to fix the reflector 36, the reflector 36 is used to converge the light emitted by the light source 35 to the collimating lens 37, the collimating lens support 34 is used to support the collimating lens 37, and the collimating lens 37 converts the converged light beam into a parallel light beam.

[0051] like Figure 4 and Figure 5 As shown, the light source mechanism 3 also includes a focal length adjustment mechanism 38, which is used to adjust the distance between the light source 35 and the first collimating lens 37, so that the light emitted by the light source 35 becomes a parallel beam after passing through the collimating lens 37.

[0052] like Figure 4 and Figure 5As shown, the focus adjustment mechanism 38 includes a lamp holder 381 and a screw 382. The light source support 32 has an annular structure. The lamp holder 381 is disposed inside the light source support 32. The lamp holder 381 is threadedly connected to the screw 382. One end of the screw 382 is rotatably connected to the light source support 32, and the other end of the screw 382 passes through the lamp holder 381 and is rotatably connected to the reflector cup support 33. By rotating the screw 382 clockwise or counterclockwise, the lamp holder 381 moves closer to or further away from the collimating lens 37.

[0053] Preferably, one end of the screw 382 extends out of the light source support 32 and is provided with a knob 383. By rotating the external knob 383, the light source 35 can be moved toward or away from the focusing lens to achieve fine-tuning of the focal length.

[0054] In one embodiment, such as Figure 4 and Figure 5 As shown, the coal quality analysis optical transceiver also includes a cooling mechanism 39, which is used to cool the light source mechanism 3.

[0055] like Figure 4 and Figure 5 As shown, the cooling mechanism 39 includes a cooling support 391, which is fixedly connected to the light source support 32. The cooling support 391 is provided with an air inlet 392 and an exhaust 394. The cooling support 391 is annular, and a hollow cavity is formed between its outer wall and inner wall. The air inlet 392 and the exhaust 394 are both connected to the hollow cavity of the cooling support 391, forming a circulating air cooling channel. The outer wall and inner wall of the light source support 32 are also a hollow cavity. A plurality of through holes 393 are provided on the bottom surface of the cooling support 391, and the through holes 393 are connected to the hollow cavity of the light source support 32.

[0056] Cooling gas enters the hollow cavity of cooling support 391 through inlet connector 392 and enters light source support 32 through through hole 393 of cooling support 391. Light source support 32 surrounds light source 35, ensuring uniform cooling of light source 35. The gas is replaced by exhaust connector 394 to achieve cyclic cooling of light source 35.

[0057] Preferably, the outer wall and inner wall of the reflector cup support 33 are also a hollow cavity, and the bottom surface of the light source support is provided with a plurality of through holes 393, which are connected to the reflector cup support 33.

[0058] More preferably, the exhaust connector 394 is disposed on the reflector cup support 33 and communicates with the reflector cup support 33.

[0059] Cooling gas enters the hollow cavity of cooling support 391 through inlet connector 392, enters light source support 32 through through hole 393 of cooling support 391, and enters reflector support 33 through through hole 393 of light source support 32. Light source support 32 and reflector support 33 surround the entire light source 35, ensuring uniform cooling of light source 35. The gas is replaced by exhaust connector 394 to achieve circulating cooling of light source 35, and at the same time, it can also cool reflector 36.

[0060] Figure 6 This is a three-dimensional schematic diagram of the recovery probe 5 described in this invention. Figure 7 This is a half-sectional schematic diagram of the recovery probe 5 described in this invention, as shown below. Figure 6 and Figure 7 As shown, the recovery probe 5 includes a first converging lens 51, a light tube 52, and a second converging lens 53. The first converging lens 51 is used to converge the reflected light from the sample passing through the window 4 into the light tube 52, and the second converging lens 53 is used to converge the light in the light tube 52 into an outwardly transmitting light transmission device (e.g., an optical fiber).

[0061] In one embodiment, the optical transceiver for coal quality analysis of the present invention further includes a probe support 6, such as... Figure 8 As shown, the probe support 6 includes a base 61 and a rotating seat 62. One end of the base 61 is fixed on the support frame 2, and the other end of the base 61 is rotatably connected to one end of the rotating seat 62. The other end of the rotating seat 62 is fixedly connected to the retrieval probe 5.

[0062] This invention also provides a calibration method for the above-mentioned optical transceiver for coal quality analysis, including...

[0063] Light is shone onto the standard substance through the light source mechanism 3;

[0064] Adjust the tilt angle of the light source mechanism 3 to obtain the spectrum of the standard substance at different tilt angles;

[0065] By comparing the above spectrum with the standard spectrum of the standard substance, the tilt angle corresponding to the spectrum with the most similar absorbance characteristic peak shape is taken as the optimal tilt angle of the light source mechanism 3.

[0066] Adjust the tilt angle of the recovery probe 5 to obtain the signal-to-noise ratio of the spectrum of the standard material at different tilt angles;

[0067] The tilt angle corresponding to the highest signal-to-noise ratio is taken as the optimal tilt angle for the recovery probe 5.

[0068] This invention expands the range of reflected light recovery from coal samples and increases light intensity.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A coal quality analysis optical transceiver device, characterized by, The coal quality analysis light receiving and transmitting device comprises a first shell, a support frame, a light source mechanism, a window sheet and a recovery probe, the first shell comprises a top plate and a bottom plate and is in a hollow structure, the support frame is fixed on the bottom plate, the support frame is used for supporting the light source mechanism and the recovery probe, the light source mechanism and the recovery probe are arranged obliquely relative to the window sheet, the window sheet is embedded in the bottom plate, the light emitted by the light source mechanism is irradiated on the coal sample after passing through the window sheet, the reflected light of the coal sample is outputted outward after passing through the window sheet and being converged by the recovery probe, the oblique angle of the light source mechanism relative to the window sheet is arranged to prevent the reflected light of the coal sample from returning to the light source mechanism after passing through the window sheet, and the oblique angle of the recovery probe relative to the window sheet is arranged to make the reflected light of the coal sample transmitted through the window sheet to be in spot coincidence in the recovery probe. The recovery probe comprises a first converging lens, a light cylinder and a second converging lens, the first converging lens is used for converging the reflected light of the sample transmitted through the window sheet into the light cylinder, and the second converging lens is used for converging the light in the light cylinder into the light transmission device for outward transmission. The coal quality analysis light receiving and transmitting device further comprises a probe support seat, the probe support seat comprises a base and a rotating seat, one end of the base is fixed on the support frame, the other end of the base is rotatably connected with one end of the rotating seat, and the other end of the rotating seat is fixedly connected with the recovery probe. The calibration of the coal quality analysis light receiving and transmitting device comprises irradiating light on the standard substance by the light source mechanism; adjusting the oblique angle of the light source mechanism to obtain the spectrum of the standard substance under different oblique angles; comparing the spectrum with the standard spectrum of the standard substance, and taking the oblique angle corresponding to the spectrum with the most similar peak shape of the absorbance characteristic peak as the optimal oblique angle of the light source mechanism; adjusting the oblique angle of the recovery probe to obtain the signal-to-noise ratio of the spectrum of the standard substance under different oblique angles of the recovery probe; taking the oblique angle corresponding to the highest signal-to-noise ratio as the optimal oblique angle of the recovery probe.

2. The coal quality analysis optical transceiver device of claim 1, wherein The height of the support frame is arranged to make the irradiation spot of the light source mechanism on the coal sample coincide with the collection spot of the recovery probe on the coal sample.

3. The coal quality analysis optical transceiver device of claim 2, wherein The device further comprises a reference plate, the reference plate is arranged between the support frame and the bottom plate and coaxially arranged with the window sheet.

4. The coal quality analysis optical transceiver device of claim 3, wherein The height of the support frame is arranged to make the irradiation spot of the light source mechanism on the reference plate overlap with the collection spot of the recovery probe on the reference plate and make the irradiation spot of the light source mechanism on the coal sample coincide with the collection spot of the recovery probe on the coal sample.

5. The coal quality analysis optical transceiver of claim 1, wherein The light source mechanism comprises a second shell, a light source support seat fixedly connected with the second shell, a light cup support seat, a collimating lens support seat, a light source, a light cup and a collimating lens, the light source support seat is used for supporting the light source, the light cup support seat is used for fixing the light cup, the light cup is used for converging the light emitted by the light source into the collimating lens, the collimating lens support seat is used for supporting the collimating lens, and the collimating lens converts the converging light beam into a parallel light beam.

6. The coal quality analysis optical transceiver device of claim 5, wherein, The light source mechanism further comprises a focal length adjusting mechanism, the focal length adjusting mechanism is used for adjusting the distance between the light source and the first collimating lens, so that the light emitted by the light source becomes a parallel light beam after passing through the collimating lens.

7. The coal quality analysis optical transceiver device of claim 6, wherein, The focal length adjusting mechanism comprises a lamp holder and a screw rod, the light source support seat is in a ring structure, the lamp holder is arranged in the light source support seat, the lamp holder is threadedly connected with the screw rod, one end of the screw rod is rotatably connected with the light source support seat, and the other end of the screw rod is rotatably connected with the reflector cup support seat through the lamp holder, and the lamp holder is made close to or away from the collimating lens by rotating the screw rod clockwise or counterclockwise.

8. The coal quality analysis optical transceiver device of claim 7, wherein, One end of the screw rod extends out of the light source support seat and is provided with a knob.

9. The coal quality analysis optical transceiver apparatus according to claim 5, wherein The cooling mechanism is further arranged for cooling the light source mechanism.

10. The coal quality analysis optical transceiver device of claim 9, wherein, The cooling mechanism comprises a cooling support seat, the cooling support seat is fixedly connected with the light source support seat, the cooling support seat is provided with an air inlet joint and an air outlet joint, the cooling support seat is in a ring structure, a hollow cavity is formed between the outer wall and the inner wall of the cooling support seat, the air inlet joint and the air outlet joint are in communication with the hollow cavity of the cooling support seat, the hollow cavity forms a circulating air cooling channel, the outer wall and the inner wall of the light source support seat are also hollow cavities, a plurality of through holes are arranged on the bottom surface of the cooling support seat, and the through holes are in communication with the hollow cavity of the light source support seat.

11. The coal quality analysis optical transceiver device of claim 10, wherein, The outer wall and the inner wall of the reflector cup support seat are also hollow cavities, a plurality of through holes are arranged on the bottom surface of the light source support seat, and the through holes are in communication with the reflector cup support seat.

12. The coal quality analysis optical transceiver device of claim 11, wherein, The air outlet joint is arranged on the reflector cup support seat and is in communication with the reflector cup support seat.

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