Portable near-infrared diffuse reflection device

Abstract

The utility model relates to a portable near-infrared diffuse reflection device which comprises a fixing plate, an optical filter is mounted on the fixing plate, a light source detector mechanism is mounted at the bottom of the fixing plate and below the optical filter, and an automatic reference switching mechanism is arranged at the bottom of the fixing plate and on one side of the light source detector mechanism. The receiving end of the micro detector and the light source are directly integrated to form transmitting and receiving light paths of diffuse reflection signals, the design of an optical fiber and a collimation system is not introduced, meanwhile, an automatic reference switching mechanism is integrated, regular reference calibration can be automatically completed, the stability of detection signals is guaranteed, and the whole device is compact in structural design, convenient to manufacture and maintain and high in reliability. And the device is very suitable for being integrated in a portable optical spectrum instrument for use.

Description

Technical Field

[0001] The utility model relates to the technical field of optical detection, in particular to a portable near-infrared diffuse reflection device. Background Art

[0002] Near-infrared spectroscopy analysis technology is a rapid and non-destructive organic component detection technology with applications in agriculture, food, medicine, beverages, fermentation, chemical industry and other fields. It has the technical advantages of qualitative / quantitative analysis, simultaneous analysis of multiple indicators, and green environmental protection.

[0003] The types of near-infrared instruments mainly include laboratory benchtop, field portable, industrial online, micro wearable and other major application scenarios. Based on the spectral signal acquisition method, they are divided into transmission detection and diffuse reflection detection.

[0004] With the development of chip technology, miniaturized spectrometers are gradually entering the mainstream market, and the application areas of portable spectroscopic instruments developed based on miniaturized detectors are constantly expanding. Portable instruments are more flexible, convenient, and lightweight. Compared with traditional desktop near-infrared instruments and online near-infrared devices, they have greater consumer market potential and more flexible application scenarios.

[0005] Traditional near-infrared instrument detectors receive external near-infrared light signals through optical fiber transmission, which places high demands on the optical fiber material and connector connection reliability. In addition, because optical fiber is not easy to bend, the overall size of the spectral instrument using optical fiber is difficult to design compactly and miniaturized, making it difficult to apply in the development of miniature portable instruments. Utility Model Content

[0006] The utility model aims to solve the deficiencies of the prior art and provides a portable near-infrared diffuse reflection device.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0008] A portable near-infrared diffuse reflection device comprises a fixed plate, a filter is mounted on the fixed plate, a light source detector mechanism is mounted on the bottom of the fixed plate below the filter, and an automatic reference switching mechanism is provided on one side of the light source detector mechanism on the bottom of the fixed plate;

[0009] The light source detector mechanism includes a light source fixing plate arranged directly below the filter, the light source fixing plate is connected to the fixing plate, a light source fixing seat is provided at the bottom of the light source fixing plate, a light source cover is provided at the bottom of the light source fixing seat, a light source is installed in the light source fixing seat, the light of the light source is irradiated vertically upward, a detector fixing plate is connected to one side of the light source fixing plate, a circuit fixing plate, a circuit board and a detector are sequentially provided on the surface of the detector fixing plate, the optical fiber head of the detector is arranged at an angle of ° to the irradiation direction of the light source, an optical fiber head fixing block is provided at the bottom of the light source fixing plate corresponding to the optical fiber head of the detector, and through holes are provided on the light source fixing plate corresponding to the light source and the detector;

[0010] The automatic reference switching mechanism includes a motor bracket installed at the bottom of the fixed plate, a stepper motor is fixed at the bottom of the motor bracket, the rotating shaft of the stepper motor is arranged upward and connected to a reference plate, a circular groove is provided at the bottom of the reference plate and the inner surface of the circular groove is sprayed with a diffuse reflection reference material, an optical coupler fixing frame is installed at the bottom of the fixed plate, an optical coupler is installed on the optical coupler fixing frame, the optical coupler is a side-mounted U-shaped structure, the reference plate is inserted into the U-shaped groove of the optical coupler, and after rotation, the reference plate is located between the light source fixing plate and the fixed plate, and the circular groove is located directly below the filter.

[0011] A heat insulation block is provided between the bottom of the light source fixing plate and the optical fiber head fixing block.

[0012] The outer wall of the light source fixing seat is provided with heat dissipation fins.

[0013] The beneficial effects of the present invention are as follows: the present invention directly integrates the receiving end of the micro-detector and the light source to form an emitting and receiving optical path for the diffuse reflection signal, does not introduce the design of the optical fiber and the collimation system, and at the same time integrates an automatic reference switching mechanism, which can complete regular reference calibration by itself to ensure the stability of the detection signal. The entire device has a compact structure design and is easy to manufacture and maintain, making it very suitable for integration into portable spectral instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of one direction of the utility model;

[0015] Figure 2 This is a structural diagram of another direction of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the light source detector mechanism in one direction;

[0017] Figure 4 It is a structural diagram of the light source detector mechanism in another direction;

[0018] Figure 5 It is a structural diagram of the automatic reference switching mechanism;

[0019] Figure 6This is a structural diagram of the automatic reference switching mechanism omitting the optical coupler part;

[0020] In the figure: 1-fixed plate; 2-filter; 3-light source detector mechanism; 4-automatic reference switching mechanism; 5-vertical connecting plate;

[0021] 31 - Light source fixing plate; 32 - Light source fixing seat; 33 - Light source cover; 34 - Light source; 35 - Detector fixing plate; 36 - Circuit fixing plate; 37 - Circuit board; 38 - Detector; 39 - Fiber head fixing block; 310 - Through hole; 311 - Heat insulation block;

[0022] 41-motor bracket; 42-stepping motor; 43-reference plate; 44-circular groove; 45-optical coupler fixing bracket; 46-optical coupler; 47-connecting cap;

[0023] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples provided are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are all in a very simplified form and are not to exact proportions, and are only used to facilitate and clearly illustrate the embodiments of the present invention.

[0025] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0028] like Figures 1 to 6 As shown, a portable near-infrared diffuse reflection device includes a fixed plate 1, on which a filter 2 is installed. The filter 2 is a circular structure and is used to filter out light outside the near-infrared region and isolate a part of the light signal directly irradiated by the light source 34 to the external sample, thereby reducing direct baking of the sample.

[0029] A light source detector mechanism 3 is installed at the bottom of the fixing plate 1 below the filter 2 , and an automatic reference switching mechanism 4 is provided at one side of the light source detector mechanism 3 at the bottom of the fixing plate 1 .

[0030] The light source detector mechanism 3 includes a light source fixing plate 31 arranged directly below the filter 2, the light source fixing plate 31 is connected to the fixing plate 1, a light source fixing seat 32 is provided at the bottom of the light source fixing plate 31, a light source cover 33 is provided at the bottom of the light source fixing seat 32, a light source 34 is installed in the light source fixing seat 32, and the light of the light source 34 is irradiated vertically upward, a detector fixing plate 35 is connected to one side of the light source fixing plate 31, and a circuit fixing plate 36, a circuit board 37 and a detector 38 are provided on the surface of the detector fixing plate 35 in sequence, the optical fiber head of the detector 38 is set at an angle of 45° to the light irradiation direction of the light source 34, forming an effective receiving surface for diffuse reflection signals, an optical fiber head fixing block 39 is provided at the bottom of the light source fixing plate 31 corresponding to the optical fiber head of the detector 38, a through hole 310 is opened on the light source fixing plate 31 corresponding to the light source 34 and the detector 38, and an insulation block 311 is provided between the bottom of the light source fixing plate 31 and the optical fiber head fixing block 39.

[0031] A vertical connecting plate 5 is provided at the bottom of the fixing plate 1 , and the light source fixing plate 31 is fixed to one side of the vertical connecting plate 5 by means of bolts.

[0032] The light source 34 is fixed in a vertically mounted light source fixing seat 32 . The outer wall of the light source fixing seat 32 is provided with heat dissipation fins. The tail of the light source 34 is fixed by a light source cover plate 33 made of heat-insulating polytetrafluoroethylene material.

[0033] The automatic reference switching mechanism 4 includes a motor bracket 41 installed at the bottom of the fixed plate 1, a stepper motor 42 is fixed at the bottom of the motor bracket 41, and a reference plate 43 is arranged upward on the rotating shaft of the stepper motor 42 and connected to the reference plate 43. A circular groove 44 is provided at the bottom of the reference plate 43, and the inner surface of the circular groove 44 is sprayed with a diffuse reflection reference material. An optical coupler fixing frame 45 is installed at the bottom of the fixed plate 1, and an optical coupler 46 is installed on the optical coupler fixing frame 45. The optical coupler 46 is a side-mounted U-shaped structure, and the reference plate 43 is inserted into the U-shaped groove of the optical coupler 46. After the reference plate 43 is rotated, it is located between the light source fixing plate 31 and the fixed plate 1, and the circular groove 44 is located directly below the filter 2.

[0034] The optical coupler 46 is a slot-type optical coupler. The slot of the optical coupler 46 is arranged toward one side of the stepper motor 42 , and the reference plate 43 can pass through the slot on the optical coupler 46 .

[0035] The motor bracket 41 includes a horizontal plate, and two L-shaped fixing plates are symmetrically provided on both sides of the top of the horizontal plate. The horizontal plates of the L-shaped fixing plates are fixedly connected to the fixing plate 1 by bolts.

[0036] A connecting cap 47 for connecting to the rotating shaft of the stepping motor 42 is provided at one end of the reference plate 43 . The connecting cap 47 is connected to the rotating shaft of the stepping motor 42 via a pin.

[0037] One side of the reference plate 43 is a planar structure and the other side is an arc-shaped structure, and a curved transition is formed between the arc-shaped structure and the connecting cap 47 .

[0038] The automatic reference switching mechanism 4 at the bottom of the fixed plate 1 rotates to the sample detection position and the reference position in sequence under the action of the driving instruction of the stepping motor 42, and the light source detector mechanism 3 completes the corresponding sample spectrum and reference spectrum acquisition work for subsequent calculation and analysis.

[0039] The present invention directly integrates the receiving end of the micro-detector and the light source 34 to form an emission and receiving optical path for the diffuse reflection signal, without introducing the design of optical fiber and collimation system. At the same time, it integrates an automatic reference switching mechanism 4, which can complete regular reference calibration by itself to ensure the stability of the detection signal. The entire device has a compact structure design and is easy to manufacture and maintain, making it very suitable for integration into portable spectral instruments.

[0040] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or they are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A portable near-infrared diffuse reflection device, characterized in that: The invention comprises a fixed plate (1), a filter (2) is mounted on the fixed plate (1), a light source detector mechanism (3) is mounted on the bottom of the fixed plate (1) below the filter (2), and an automatic reference switching mechanism (4) is provided on one side of the light source detector mechanism (3) at the bottom of the fixed plate (1); The light source detector mechanism (3) comprises a light source fixing plate (31) arranged directly below the filter (2), the light source fixing plate (31) being connected to the fixing plate (1), a light source fixing seat (32) being provided at the bottom of the light source fixing plate (31), a light source cover plate (33) being provided at the bottom of the light source fixing seat (32), a light source (34) being installed in the light source fixing seat (32), the light of the light source (34) being irradiated vertically upward, a detector fixing plate (35) being connected to one side of the light source fixing plate (31), a circuit fixing plate (36), a circuit board (37) and a detector (38) being provided on the surface of the detector fixing plate (35) in sequence, the optical fiber head of the detector (38) being arranged at an angle of 45° to the irradiation direction of the light of the light source (34), an optical fiber head fixing block (39) being provided at the bottom of the light source fixing plate (31) corresponding to the optical fiber head of the detector (38), and a through hole (310) being provided on the light source fixing plate (31) corresponding to the light source (34) and the detector (38); The automatic reference switching mechanism (4) comprises a motor bracket (41) mounted on the bottom of the fixed plate (1), a stepper motor (42) being fixed on the bottom of the motor bracket (41), a reference plate (43) being arranged on the rotating shaft of the stepper motor (42) and connected thereto, a circular groove (44) being provided on the bottom of the reference plate (43), and a diffuse reflection reference material being sprayed on the inner surface of the circular groove (44), an optical coupler fixing frame (45) being mounted on the optical coupler fixing frame (45), an optical coupler (46) being a side-mounted U-shaped structure, the reference plate (43) being inserted into the U-shaped groove of the optical coupler (46), and the reference plate (43) being located between the light source fixing plate (31) and the fixing plate (1) after rotation, and the circular groove (44) being located directly below the optical filter (2).

2. A portable near-infrared diffuse reflection device according to claim 1, characterized in that: A heat insulation block (311) is provided between the bottom of the light source fixing plate (31) and the optical fiber head fixing block (39).

3. The portable near-infrared diffuse reflection device according to claim 2, characterized in that: Heat dissipation fins are provided on the outer wall of the light source fixing seat (32).

4. The portable near-infrared diffuse reflection device according to claim 3, characterized in that: A vertical connecting plate (5) is provided at the bottom of the fixing plate (1), and the light source fixing plate (31) is fixed to one side of the vertical connecting plate (5) by means of bolts.

5. The portable near-infrared diffuse reflection device according to claim 1, characterized in that: The motor bracket (41) comprises a horizontal plate, and two L-shaped fixing plates are symmetrically provided on both sides of the top of the horizontal plate, and the transverse plates of the L-shaped fixing plates are fixedly connected to the fixing plate (1) by bolts.

6. The portable near-infrared diffuse reflection device according to claim 5, characterized in that: One end of the reference plate (43) is provided with a connecting cap (47) for connecting with the rotating shaft of the stepping motor (42), and the connecting cap (47) is connected to the rotating shaft of the stepping motor (42) through a pin.

7. The portable near-infrared diffuse reflection device according to claim 6, characterized in that: One side of the reference plate (43) is a planar structure and the other side is an arc-shaped structure, and a curved transition is formed between the arc-shaped structure and the connecting cap (47).

8. The portable near-infrared diffuse reflection device according to claim 7, characterized in that: The filter (2) is a circular structure.

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