Embedded darkroom structure of portable weak light detector

Abstract

The utility model relates to the field of weak light detection, and discloses an embedded darkroom structure of a portable weak light detector, which comprises a cover (1), a port (3), a receiving tube (5), a light collecting bin (7), a reflector (10) and a photoelectric sensor (11), and is characterized in that the cover (1) is buckled with the port (3); an upper cover body and a lower cover body of the light collection bin (7) are buckled; the upper portion of the receiving tube (5) is connected with the port (3), and the lower portion of the receiving tube (5) is connected with the light collecting bin (7). The cover (1), the port (3), the receiving tube (5) and the light collecting bin (7) form a darkroom, and the reflector (10) and the photoelectric sensor (11) are sealed in the darkroom.

Description

Technical Field

[0001] The utility model relates to the field of weak light detection, and particularly relates to an embedded darkroom structure of a portable weak light detector. Background Art

[0002] The weak light detector uses precision optoelectronic sensors such as photodiodes, photomultiplier tubes, avalanche diodes, etc., combined with a signal amplification circuit to realize the detection of weak light signals. Among them, the light shielding treatment of the instrument is the key to the design. For the weak light detector, in the prior art, the overall light shielding of the instrument shell is adopted. Especially for the portable detector, the volume is often small and an effective embedded darkroom cannot be developed. Often, only the external all visible light can be isolated by the instrument shell.

[0003] There are many defects in the method of overall light shielding of the instrument shell. Because some devices inside the instrument are equipped with indicator lights (such as motor drivers) or other light-emitting devices, and even indicator lights and other light-emitting devices sometimes need to be installed on the instrument shell, these will have an impact on the weak light test; the instrument shell must also be kept light-shielded without any openings, and the most commonly used USB interface cannot be exposed, resulting in the inability to connect the USB port for data communication and charging when the instrument is in the detection state. The inability to open holes in the shell to add communication interfaces greatly limits the multi-functional application of the instrument.

[0004] Patent CN 218823935U provides a new type of ATP detector, which adopts the overall light shielding of the instrument shell. Its USB port is set inside the instrument and can only be used when the instrument is running and the cover is open. Although this utility model uses wireless charging to make up for the defect that the USB port cannot be charged during the detection state, the wireless charging device also increases the cost. Patent CN 218823935U provides a darkroom for a weak light detector. There is an annular hole on the darkroom cover for sample insertion. The light collection port must be set on the diagonal line of the annular hole to reduce light leakage. In addition, the optoelectronic sensor is not sealed in the darkroom, but the light is led from the darkroom to the optoelectronic sensor through the light. Therefore, the entire light signal detection path from the sample inlet hole to the optoelectronic sensor cannot be completely sealed in the darkroom, and there is a risk of light leakage; Patent CN 107430060B provides a light detection device, which adopts a partial darkroom structure, and the reflector is not sealed in the darkroom, there is a risk of light leakage. Content of the Utility Model

[0005] The problem solved by the present utility model is to construct an independent dark room embedded inside the detector, avoiding the many problems that exist when the outer shell of the practical instrument is used as a dark room, such as light leakage, and the outer shell of the instrument cannot have openings, which thus limits many applications of the instrument. For example, it is impossible to set an opening for a USB interface on the outer shell of the instrument, and it is impossible to open holes on the outer shell of the instrument to set other communication interfaces, greatly restricting the development of the instrument's functions. Reflectors and photoelectric sensors are usually affected by various components on the instrument circuit board. In the present utility model, the reflector and the photoelectric sensor are placed in an independent light collection chamber and can be affected by the light generated by the internal components of the instrument. In addition, in the traditional method, the receiving tube is inserted into the reflector without being fastened, and the reflector is fixed to the circuit board by screws. When the instrument shakes, the shaking between the internal components will cause vibration interference to the photoelectric sensor. In the present utility model, the components of the dark room are firmly connected to effectively reduce the shaking between the components, thereby reducing the interference of vibration on the instrument detection. Another extremely important point is that the currently few adopted dark room structures cannot seal the main light detection components, such as reflectors and photoelectric sensors, in the dark room, and there is still a great risk of light leakage.

[0006] To solve the above technical problems, the present utility model provides an embedded dark room structure for a weak light detector, which includes a lid, a port, a receiving tube, a light collection chamber, a reflector, and a photoelectric sensor. The lid and the port are snapped together. The upper part of the receiving tube and the sample inlet hole of the port are aligned with the central axis of the receiving tube and are connected in cooperation with the groove. The lower cover and the upper cover of the light collection chamber are snapped together. The lower part of the receiving tube is connected to the light collection chamber. The lid, the port, the receiving tube, and the light collection chamber form a dark room. The lower part of the receiving tube is connected to the reflector. The bottom side of the reflector is provided with a light collection port, and the light signal in the detected sample is output from the light collection port to the photoelectric sensor. The reflector and the photoelectric sensor are sealed in the dark room.

[0007] Preferably, a transparent cover is provided inside the reflector. The function of the transparent cover is to set a barrier between the sample and the photoelectric sensor to prevent the sample from contaminating the photoelectric sensor. The transparent cover is made of high-transparency plastic to ensure sufficient transparency and reduce signal loss.

[0008] Preferably, the reflector and the lower part of the receiving tube are connected by screws.

[0009] Preferably, the lid and the port are provided with first concave and convex grooves to enhance the seal;

[0010] Preferably, the upper and lower covers of the light collection chamber are provided with second concave and convex grooves to enhance the seal;

[0011] Preferably, the reflector is fixed to the light collection chamber by screws.

[0012] In summary, the present utility model has at least the following beneficial effects:

[0013] 1. The darkroom includes a lid, a port, a receiving tube, a light collection chamber, and a reflector. All components are effectively connected and sealed to block external light from entering. It can be embedded in the housing of the detector, unaffected by the light generated by the internal components of the detector, and even if there are openings on the instrument housing, it will not affect the light shielding property of the darkroom;

[0014] 2. The reflector and the photoelectric sensor are sealed in the light collection chamber to ensure effective light shielding for the photoelectric sensor and the reflector;

[0015] 3. The receiving tube is connected to the reflector below by screws or glue, and the reflector is fixed to the lower cover of the light collection chamber by screws to improve the stability of the darkroom and avoid vibration interference caused by the shaking of the instrument.

[0016] 4. The lid and the port are fastened by the first concave-convex groove, and the upper and lower covers of the light collection chamber are fastened by the second concave-convex groove to enhance the sealing performance and avoid light leakage. Description of the Drawings

[0017] Figure 1 is a side sectional view of the darkroom of the present utility model;

[0018] Figure 2 is a front sectional view of the darkroom of the present utility model;

[0019] Figure 3 is a front isometric view of the darkroom of the present utility model;

[0020] In the figure: 1. Lid; 2. First concave-convex groove; 3. Port; 4. Sample inlet hole; 5. Receiving tube; 6. Sealing ring; 7. Light collection chamber; 8. Transparent cover; 9. Circuit board; 10. Reflector; 11. Photoelectric sensor; 12. Light collection port; 13. Second concave-convex groove; 14. Sealing member; 15. Cable hole Detailed Description of the Embodiment

[0021] The following further describes the present utility model in detail with reference to the accompanying drawings.

[0022] Embodiment 1

[0023] The present utility model discloses an embedded darkroom structure for a weak light detector. Referring to Figure 1 , it includes a lid 1, a port 3, a receiving tube 5, a light collection chamber 7, a reflector 10, and a photoelectric sensor 11. The lid 1 and the port 3 are fastened by the first concave-convex groove 2. See Figure 2Below port 3, there is a sample inlet hole 4. Above the receiving tube 5 and the sample inlet hole 4 are aligned with the central axis of the receiving tube 5. Port 3 and the receiving tube 5 are connected in a mating manner. The lower cover and the upper cover of the light collection chamber 7 are snapped together through the second concave-convex grooves 13. The receiving tube 5 is inserted into the opening on the light collection chamber 7 and cooperates with the light collection chamber 7, and is sealed by a sealing ring 6. The sealing ring 6 is sleeved on the receiving tube 5. The lid 1, port 3, receiving tube 5, and light collection chamber 7 form an enclosed dark room.

[0024] The reflector 10 is aligned with the central axis of the receiving tube 5. The reflector 10 is connected and fixed to the light collection chamber 7 by screws or glue, and the reflector 10 is sealed inside the light collection chamber 7. On the bottom side of the reflector 10, there is a light collection port 12. The light in the detected sample is output from the light collection port 12 to the photoelectric sensor 11.

[0025] On the circuit board 9, there is a photoelectric sensor 11. The photoelectric sensor 11 is facing the light collection port 12 and is used for light signal detection. The circuit board 9 and the photoelectric sensor 11 are sealed inside the light collection chamber 7, and external light sources cannot enter. The detected sample enters the dark room from port 3, passes through the receiving tube 5, and finally reaches the bottom of the reflector 10. The reflector 10 reflects the light to the photoelectric sensor 11. The photoelectric sensor 11 is sealed inside the light collection chamber 7.

[0026] The surface of the reflector 10 has a reflective property. The reflector 10 can be made of a reflective metal such as aluminum alloy, or made of plastic and plated with a reflective metal on the surface. The receiving tube 5 and port 3 can also be injection-molded into one body to improve the sealing performance.

[0027] Embodiment 2

[0028] Based on Embodiment 1, further improvements are made. Inside the reflector 10, there is a transparent cover 8. The function of the transparent cover 8 is to set a barrier between the sample and the photoelectric sensor to prevent the sample from contaminating the photoelectric sensor 11. The transparent cover 8 is made of high-transparency plastic to ensure sufficient transparency and reduce signal loss.

[0029] Embodiment 3

[0030] Based on Embodiment 1, further improvements are made. There is an opening on the side of the light collection chamber 7 and a seal 14 is installed. See Figure 2 and Figure 3 , and there is a wire arrangement hole 15 on the seal 14. Sealant can be used to strengthen the seal at the wire arrangement hole 15. The wire arrangement on the circuit board 9 extends to the outside of the dark room through the opening, and the seal 14 can effectively block the entry of light.

[0031] Embodiment 4

[0032] Based on Embodiment 1, further improvements are made. Below the receiving tube 5 and the reflector 10 are connected by screws or glue.

Claims

1. An embedded darkroom structure of a portable low-light detector, comprising a lid (1), a port (3), a receiving tube (5), a light collection chamber (7), a reflector (10), and a photoelectric sensor (11), characterized in that, The lid (1) and the port (3) are snapped together; the upper and lower covers of the light collection chamber (7) are snapped together; above the receiving tube (5) is connected to the port (3), and below the receiving tube (5) is connected to the light collection chamber (7); the lid (1), port (3), receiving tube (5), and light collection chamber (7) form a darkroom, and the reflector (10) and the photoelectric sensor (11) are sealed in the darkroom.

2. The embedded darkroom structure of the portable low-light detector according to claim 1, characterized in that, The lid (1) and the port (3) are provided with first concave-convex grooves (2).

3. The embedded darkroom structure of the portable low-light detector according to claim 1, characterized in that, The upper and lower covers of the light collection chamber (7) are provided with second concave-convex grooves (13).

4. The embedded darkroom structure of the portable low-light detector according to claim 1, characterized in that The reflector (10) is provided with a light collection opening (12).

5. The embedded darkroom structure of the portable low-light detector according to claim 1, characterized in that, The reflector (10) is made of a reflective metal such as aluminum alloy, or made of plastic and coated with a reflective metal on the surface.

6. The embedded darkroom structure of the portable low-light detector according to claim 1, characterized in that A transparent cover (8) is provided inside the reflector (10).

7. The embedded darkroom structure of the portable low-light detector according to claim 1, characterized in that, The reflector (10) and the lower part of the receiving tube (5) are connected by glue or screws.

8. The embedded darkroom structure of the portable low-light detector according to claim 1, characterized in that, The light collection chamber (7) and the reflector (10) are fastened by screws or glue.

9. The embedded darkroom structure of the portable low-light detector according to claim 1, characterized in that, The light collection chamber (7) is provided with an opening and a seal (14) is installed at the opening.

10. The embedded darkroom structure of the portable low-light detector according to claim 9, characterized in that The seal (14) is provided with a cable hole (15).

Images