Focal-length-adjustable near-infrared optical fiber probe

Abstract

The utility model relates to a near-infrared optical fiber probe with an adjustable focal length, which belongs to the technical field of near-infrared inspection and comprises a probe seat, a probe support is arranged at the front end of the probe seat, and a standard white board fixedly connected with the probe support in a nested manner is arranged at the front end of the probe support. An optical fiber collimating mirror communicated with the standard white board is arranged at the rear end of the probe seat, lamp holder assemblies which are inserted and embedded with the probe seat and are communicated with the standard white board are arranged on two sides of the optical fiber collimating mirror, and a focal length adjusting support movably inserted with the probe seat is arranged between the probe seat and the probe support. The device has the characteristics of compact structure, good operation stability and long service life. The distance between the probe and the glass is adjusted by adjusting the position of the bracket, so that the focus is adjusted to a proper position. The problem of focal length mismatching is solved. And meanwhile, the problems of overheating, dust accumulation and circuit instability are effectively solved. And the overall performance and the service life of the probe are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of near-infrared inspection, and particularly relates to an adjustable-focus near-infrared fiber optic probe. Background Technique

[0002] The granulating fluidized bed is used to complete the processes of granulation, coating and drying at one time during the pharmaceutical process and has been widely used in pharmaceutical production. The diameter of the particles obtained by the fluidized bed not only affects the subsequent process flow, but also directly affects the quality of the final drug. However, the existing operating parameters of the granulating fluidized bed are fixed during the production process, and the raw material batches and environmental conditions change with time, but the operating parameters cannot be adjusted accordingly, resulting in poor consistency of drug quality or even unqualified products.

[0003] By performing real-time online detection of the particle diameter, the operating parameters can be adjusted according to the changes, so that the particle diameter distribution is within the desired range, thereby monitoring the granulation process and ensuring the drug quality. Therefore, the online detection of the particle diameter during the fluidized bed granulation process is very necessary.

[0004] Quality inspection has always been an important step to ensure the qualified quality of drugs. The common online detection devices in the fluidized bed granulation process take samples and detect them by inserting sampling parts deep into the fluidization chamber when the fluidized bed is working. However, the fluidized bed is a closed working space, and the entry of the sampling parts may interfere with the normal fluidization granulation flow field and affect the granulation process and results.

[0005] The "Detection Sensor" with the Chinese patent application number CN202020789388.9 discloses that the detection sensor includes a base body, an emission optical path and a recovery optical path are arranged in the base body, there are 2 or more than 2 emission optical paths, all the emission optical paths enter from the outer surface of the window glass, all the emission optical paths intersect at the same area, and the area is located outside the base body; the area is located on the recovery optical path; the emission optical path includes a light source and a convex lens; the recovery optical path includes a light receiver and a convex lens; the light source has a power connection part, and the light receiver is connected to an optical fiber.

[0006] The focal length of the probe in the prior art is fixed, that is, the distance from the focus of the axis of the fiber collimating mirror and the axis of the bulb to the surface of the probe. When the thickness of the measured window glass is different, the following problems will occur:

[0007] 1. Focal length mismatch: When the glass is too thick, the focus will be too close to the probe and focus on the glass layer; when the glass is too thin, the focus will be too far and focus inside the glass, which will result in insufficient light intensity and affect the detection effect.

[0008] 2. Overheating problem: Due to the large power of the bulb, the probe will overheat after long-term operation, affecting normal operation.

[0009] 3. Dust accumulation: In some working environments, the air contains easily adherent dust. Long-term use will cause a large amount of dust to accumulate on the surface of the bulb or fiber collimator, affecting the light path and thus the detection results.

[0010] 4. Circuit problem: Frequent plugging and unplugging of bulb components can easily lead to internal circuit breakage, short circuit or poor contact. Summary of the invention

[0011] The utility model mainly solves the deficiencies in the prior art and provides an adjustable focal length near-infrared optical fiber probe, which has the characteristics of compact structure, good operation stability and long service life. It solves the problem of focal length mismatch. At the same time, it effectively solves the problems of overheating, dust accumulation and circuit instability. It improves the overall performance and service life of the probe.

[0012] The above technical problems of the utility model are mainly solved by the following technical solutions:

[0013] A near-infrared optical fiber probe with adjustable focal length comprises a probe seat, a probe holder is provided at the front end of the probe seat, a standard whiteboard is provided at the front end of the probe holder and is connected and fixed to the probe holder, an optical fiber collimator is provided at the rear end of the probe seat and is connected to the standard whiteboard, lamp holder assemblies are provided on both sides of the optical fiber collimator and are inserted into the probe seat and are connected to the standard whiteboard, and a focal length adjustment bracket is provided between the probe seat and the probe holder and is movably plugged into the probe seat. By adjusting the position of the bracket, the distance between the probe and the glass is adjusted, so that the focus is adjusted to a suitable position.

[0014] The function of the standard white board is to calibrate the spectrum and is used for total reflection of light. The standard white board is generally used in the measurement of colorimetry and photometry, and is also used in the calibration or verification of whiteness meters and colorimeters.

[0015] Preferably, the lamp holder assembly includes a bulb holder, a bulb nested in the bulb holder is provided at the front end of the bulb holder, and a bulb plug threadedly sleeved and fixed to the bulb holder is provided at the rear end of the bulb. The bulb holder ensures that the plug and the bulb are in a stable state, avoids stress on the welding point during frequent plugging and unplugging, and ensures the reliability of the circuit connection.

[0016] Preferably, a quick-insert air joint connected to the lamp holder assembly is provided between the lamp holder assembly and the optical fiber collimator, and the quick-insert air joint is threadedly sleeved and fixed to the probe seat. Clean compressed air is introduced through the quick-insert air joint to clean the internal optical path, thereby preventing dust accumulation. At the same time, the compressed air can take away the internal heat during the purge process, thereby achieving a cooling effect.

[0017] Preferably, the periphery of the bulb holder is provided with a plurality of air guide grooves distributed in an annular shape and connected to the quick-insert air connector.

[0018] Preferably, an adjusting plate is provided at the upper end of the probe base and is fixedly connected to the focal length adjusting bracket by screws. When the hole positions at the upper end of the adjusting plate and the corresponding empty positions on the probe base are aligned in sequence from left to right and from top to bottom, six adjusting points of 0 mm, 2 mm, 4 mm, 6 mm, 8 mm, and 10 mm are adjusted out corresponding to the adjusting bracket. The distance between the hole positions on the adjusting plate is 4 mm in the X direction and 2 mm in the Y direction, and the distance between the hole positions on the probe base is 4 mm in the X direction and 4 mm in the Y direction. Thus, when the hole positions are aligned in the X direction, the distances relative to the 0 point in the Y direction are 0 mm, 2 mm, 4 mm, 6 mm, 8 mm, and 10 mm respectively, thereby realizing the adjustment of the focal length.

[0019] The utility model can achieve the following effects:

[0020] The utility model provides an adjustable focal length near-infrared fiber optic probe, which has the characteristics of compact structure, good operation stability, and long service life compared with the prior art. It solves the problem of focal length mismatch. At the same time, it effectively solves the problems of overheating, dust accumulation, and circuit instability. It improves the overall performance and service life of the probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the utility model.

[0022] Figure 2 is an exploded view of the structure of the utility model.

[0023] Figure 3 is a cross-sectional view of the structure of the utility model.

[0024] In the figure: standard white board 1, probe bracket 2, focal length adjusting bracket 3, probe base 4, adjusting plate 5, quick-connect air joint 6, fiber optic collimator 7, lamp holder assembly 8, light bulb 9, air guide groove 10, light bulb bracket 11, light bulb plug 12. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The technical solutions of the utility model will be further specifically described below through embodiments and in conjunction with the drawings.

[0026] Embodiment: As Figure 1 、 Figure 2 and Figure 3As shown in the figure, an adjustable focal length near-infrared fiber optic probe includes a probe base 4. At the front end of the probe base 4, there is a probe support 2. At the front end of the probe support 2, there is a standard whiteboard 1 that is nested and fixedly connected to the probe support 2. At the rear end of the probe base 4, there is an optical fiber collimator 7 that communicates with the standard whiteboard 1. On both sides of the optical fiber collimator 7, there are lamp holder assemblies 8 that are inserted into the probe base 4 and communicate with the standard whiteboard 1. The lamp holder assembly 8 includes a lamp bulb support 11. At the front end of the lamp bulb support 11, there is a lamp bulb 9 that is nested with the lamp bulb support 11. At the rear end of the lamp bulb 9, there is a lamp bulb plug 12 that is fixedly connected to the lamp bulb support 11 by threaded socketing. Between the lamp holder assembly 8 and the optical fiber collimator 7, there are quick-connect air joints 6 that communicate with the lamp holder assembly 8. The quick-connect air joints 6 are fixedly connected to the probe base 4 by threaded socketing. There are 4 air guide grooves 10 that are annularly distributed and communicate with the quick-connect air joints 6 around the lamp bulb support 11. Between the probe base 4 and the probe support 2, there is a focal length adjustment support 3 that is movably inserted into the probe base 4. At the upper end of the probe base 4, there is an adjustment plate 5 that is fixedly connected to the focal length adjustment support 3 by screws.

[0027] In summary, the adjustable focal length near-infrared fiber optic probe has the characteristics of being structurally compact, having good operating stability, and a long service life. It solves the problem of focal length mismatch. At the same time, it effectively solves the problems of overheating, dust accumulation, and circuit instability. It improves the overall performance and service life of the probe.

[0028] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the basic characteristics of the utility model. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0029] In short, the above description is only the specific embodiments of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the field of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A near-infrared optical fiber probe with adjustable focal length, characterized in that: The invention comprises a probe seat (4), wherein a probe bracket (2) is provided at the front end of the probe seat (4), a standard whiteboard (1) which is nested and connected to the probe bracket (2) is provided at the front end of the probe bracket (2), a fiber optic collimator (7) which is connected to the standard whiteboard (1) is provided at the rear end of the probe seat (4), and light bracket assemblies (8) which are inserted into the probe seat (4) and connected to the standard whiteboard (1) are provided on both sides of the fiber optic collimator (7), and a focus adjustment bracket (3) which is movably plugged into the probe seat (4) is provided between the probe seat (4) and the probe bracket (2).

2. The near-infrared optical fiber probe with adjustable focal length according to claim 1, characterized in that: The lamp holder assembly (8) comprises a bulb holder (11), the front end of the bulb holder (11) being provided with a bulb (9) nested with the bulb holder (11), and the rear end of the bulb (9) being provided with a bulb plug (12) threadedly sleeved and fixed with the bulb holder (11).

3. The near-infrared optical fiber probe with adjustable focal length according to claim 2, characterized in that: A quick-insert air connector (6) connected to the lamp holder assembly (8) is provided between the lamp holder assembly (8) and the optical fiber collimator (7), and the quick-insert air connector (6) is threadedly sleeve-connected and fixed to the probe seat (4).

4. The near-infrared optical fiber probe with adjustable focal length according to claim 3, characterized in that: The outer periphery of the light bulb holder (11) is provided with a plurality of air guide grooves (10) distributed in an annular shape and connected to the quick-insert air connector (6).

5. The near-infrared optical fiber probe with adjustable focal length according to claim 1, characterized in that: An adjustment plate (5) is provided at the upper end of the probe seat (4) and is fixedly connected to the focal length adjustment bracket (3) by screws.

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