CN210124759U - Weak light detection device based on photomultiplier - Google Patents
Weak light detection device based on photomultiplier Download PDFInfo
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- CN210124759U CN210124759U CN201920178543.0U CN201920178543U CN210124759U CN 210124759 U CN210124759 U CN 210124759U CN 201920178543 U CN201920178543 U CN 201920178543U CN 210124759 U CN210124759 U CN 210124759U
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Abstract
The utility model discloses a weak light detection device based on photomultiplier, include: the device comprises a closed box body, a base arranged in the closed box body, a photomultiplier and a photoelectric counting unit arranged in the base, a protective sliding door mechanism arranged on the base, a cambered surface light-transmitting element arranged on a detection port formed in the upper portion of the closed box body, a light guide port formed in the upper portion of the base and communicated with the detection port, and a control end connected with the photomultiplier and the photoelectric counting unit. The utility model can realize the automatic light-shading protection of the photomultiplier by arranging the protective sliding door mechanism; the detection area of the photomultiplier is increased by arranging the cambered surface light-transmitting element. The utility model discloses a faint light detection device based on photomultiplier can effectively protect photomultiplier's safety, increases photomultiplier's detection area, improves photomultiplier and detects the precision. The utility model discloses simple structure, be convenient for clean, can improve photomultiplier life and detection precision.
Description
Technical Field
The utility model relates to a weak light detection field, in particular to weak light detection device based on photomultiplier.
Background
The photomultiplier PMT can measure infinitesimal radiation power with the wavelength of 200-1200 nanometers in the aspects of low-level photometry and spectroscopy due to high measurement sensitivity. The method is widely applied to the fields of metallurgy, electronics, machinery, chemical engineering, geology, medical treatment, nuclear industry, astronomy, cosmos and the like.
The sensitivity of the photosensitive element of the photomultiplier tube PMT is extremely high, the long-term exposure can affect the service life and the detection precision, and the photomultiplier tube PMT is a core component of weak light detection equipment in an organism, the price of the photomultiplier tube PMT is expensive, and the replacement cost is high, so that how to protect the photomultiplier tube PMT in the weak light detection equipment in the organism is very important to improve the service life and the detection precision. Meanwhile, when the photomultiplier tube PMT is used closely, the loss of light energy is small, the measurement precision is high, but the field of view detected by the photomultiplier tube PMT is small during short-distance measurement, the area of the detected organism is small, and the field of view which can be detected can not completely cover a certain tissue or organ of the organism to be detected.
At present, when weak fluorescence detection and counting are carried out in organisms, the organisms are usually directly attached to a light receiving end face of a photomultiplier tube (PMT) so as to ensure the sensitivity and the accuracy of measurement. This measurement is limited by the area of the PMT light-receiving end face, so that the area of biological tissue that can be accurately detected at a time is very small. Meanwhile, the cover surface needs to be cleaned during each detection, and the light receiving surface of the PMT is generally embedded in the middle of the PMT unit, so that the PMT is inconvenient to scrub and is easy to damage. The photomultiplier PMT is a weak light detection element, has high sensitivity to light induction, and can damage a photosensitive element in the photomultiplier PMT to reduce the measurement sensitivity and even discard the photomultiplier under the condition of long-term illumination. At present, photomultiplier's the light-resistant protection mode that uses usually is, be fixed in a inclosed area lid box with photomultiplier PMT, when not using, reach the light-resistant effect with the straining lid, the animal that will detect during the use is arranged in the box and is detected, this kind of detection method, when placing the toy, have the light leakage to enter, lead to the fact certain damage to the light-sensitive element in photomultiplier PMT, influence the measuring accuracy simultaneously, also can cause certain influence to the measuring result.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to the not enough among the above-mentioned prior art, provide a weak light detection device based on photomultiplier. The defects of the existing method are overcome, and the service life, the detection area and the detection precision of the PMT are improved.
In order to solve the technical problem, the utility model discloses a technical scheme is: a weak light detection device based on a photomultiplier comprises: the sealed box body, set up in base in the sealed box body, set up in photomultiplier and photoelectric counting unit in the base, set up in protection on the base moves a mechanism, set up in cambered surface printing opacity component on the detection mouth that sealed box body upper portion was seted up, set up in base upper portion and with the leaded light mouth that detects the mouth intercommunication and with the control end that photomultiplier and photoelectric counting unit all are connected.
Preferably, the airtight box body sets up on the bottom plate, the base including connect in collateral branch backup pad on the bottom plate and connect in the mounting panel on collateral branch backup pad upper portion, the leaded light mouth is seted up the mounting panel middle part.
Preferably, the protective sliding door mechanism comprises a light screen mounting seat arranged on the mounting plate, a light screen arranged in a light screen sliding groove formed in the light screen mounting seat in a sliding manner, a light screen cover plate covered on the light screen and a rocker driving mechanism used for driving the light screen to slide.
Preferably, the rocker driving mechanism comprises a motor and a rocker with one end connected with an output shaft of the motor, the other end of the rocker is slidably arranged in a rocker sliding groove formed in the light shielding plate, and the forming direction of the rocker sliding groove is perpendicular to the movement direction of the light shielding plate.
Preferably, a pressure lever is further arranged between the light screen cover plate and the light screen mounting seat, and a spring is connected between the pressure lever and the light screen cover plate.
Preferably, photoelectric switches are arranged on two sides of the mounting plate along the movement direction of the light shading plate.
Preferably, a first opening for communicating the light guide port and the detection port is formed in the light shielding plate cover plate, and an optical filter is arranged on the first opening.
Preferably, the light screen mounting seat is provided with a second opening for communicating the light guide port and the first opening.
Preferably, the photomultiplier is disposed below the light guide opening.
Preferably, light emitted by the sample on the cambered surface light-transmitting element sequentially passes through the cambered surface light-transmitting element on the detection port, the optical filter on the first opening, the second opening and the light guide port and then reaches the photomultiplier.
The utility model has the advantages that: the utility model can realize the automatic light-shading protection of the photomultiplier by arranging the protective sliding door mechanism; the detection area of the photomultiplier is increased by arranging the cambered surface light-transmitting element. The utility model discloses a faint light detection device based on photomultiplier can effectively protect photomultiplier's safety, increases photomultiplier's detection area, improves photomultiplier and detects the precision. The utility model discloses simple structure, be convenient for clean, can improve photomultiplier life and detection precision.
Drawings
Fig. 1 is a schematic cross-sectional view of the overall structure of a photomultiplier-based weak light detection device according to the present invention;
fig. 2 is a schematic structural view of the protective sliding door mechanism of the present invention (light screen closed);
fig. 3 is a schematic diagram of the internal structure of the photomultiplier-based weak light detection device of the present invention (with the light shielding plate open and the sealed box removed);
fig. 4 is a schematic diagram of the internal structure of the photomultiplier-based weak light detection device of the present invention (the light shielding plate is opened, and the cover plate of the light shielding plate is removed);
fig. 5 is a schematic structural diagram of the light screen mounting seat of the present invention.
Description of reference numerals:
1. a base plate; 2. sealing the box body; 3. side supporting plates; 4. a motor; 5. a rocker mechanism; 6. a pressure lever; 7. a cambered surface light-transmitting element; 8. a mouse; 9. a spring; 10. a visor; 11. a photoelectric switch; 12. a base; 13. a photomultiplier tube; 14. a light guide port; 15. a photon counting unit; 16. a computer control terminal; 17. A cable; 18. an optical filter; 19. a visor cover plate; 20. a light screen mounting seat; 21. a rocker mechanism prime mover; 22. a rocker mechanism follower; 23. a rocker; 100. a rocker chute; 101. a baffle plate; 120. Mounting a plate; 190 — a first opening; 200. a light screen chute; 201. a second opening.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can implement the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
As shown in fig. 1 to 5, a weak light detection device based on a photomultiplier tube 13 according to the present embodiment includes: the device comprises a closed box body 2, a base 12 arranged in the closed box body 2, a photomultiplier 13 and a photoelectric counting unit which are arranged in the base 12, a protective sliding door mechanism arranged on the base 12, a cambered surface light-transmitting element 7 arranged on a detection port formed in the upper part of the closed box body 2, a light guide port 14 formed in the upper part of the base 12 and communicated with the detection port, and a control end connected with the photomultiplier 13 and the photoelectric counting unit. The cambered surface light-transmitting element 7 can increase the attachment area of organisms, namely the detection area of the photomultiplier 13, and is convenient to scrub. In a preferred embodiment, the cambered surface light-transmitting element 7 is a convex lens.
Wherein, the closed box body 2 is arranged on the bottom plate 1, the base 12 comprises a side supporting plate 3 connected on the bottom plate 1 and a mounting plate 120 connected on the upper part of the side supporting plate 3, and the light guide port 14 is arranged in the middle of the mounting plate 120.
Referring to fig. 1 and 2, the protective sliding door mechanism includes a light shielding plate mounting seat 20 disposed on the mounting plate 120, a light shielding plate 10 slidably disposed in a light shielding plate sliding slot 200 formed on the light shielding plate mounting seat 20, a light shielding plate cover plate 19 covering the light shielding plate 10, and a rocker driving mechanism for driving the light shielding plate 10 to slide. The rocker driving mechanism comprises a motor 4 and a rocker 23, one end of the rocker 23 is connected with an output shaft of the motor 4, and the other end of the rocker 23 can be slidably arranged in a rocker sliding groove 100 formed in the light screen 10; the connection end of the rocker and the output shaft of the motor 4 is the rocker mechanism driving link 21, and the end of the rocker embedded in the rocker sliding groove 100 is the rocker mechanism driven link 22. The opening direction of the rocker chute 100 is perpendicular to the moving direction of the light shielding plate 10. The light screen 10 is installed in the light screen sliding groove 200, and the two are in clearance fit, so that the light screen 10 can slide left and right therein. The output shaft of the motor 4 drives the driving link 21 of the rocker mechanism to rotate, and then drives the driven link 22 of the rocker mechanism to move, the rocker driven link is embedded into the rocker chute 100, the rocker chute 100 limits the rocker driven link to enable the rocker 23 driven link to only slide up and down in the rocker chute, and therefore the light screen 10 is driven to move left and right.
Wherein, a pressure lever 6 is arranged between the light screen cover plate 19 and the light screen mounting seat 20, and a spring 9 is connected between the pressure lever 6 and the light screen cover plate 19. The press rod 6 is matched with the spring 9 and is used for pressing the light shielding plate 10 to prevent stray light between the binding surfaces of the light shielding plate 10 and the light shielding plate mounting seat 20 from entering the photomultiplier 13.
The photoelectric switches 11 are disposed on both sides of the mounting plate 120 along the movement direction of the light shielding plate 10. Two baffles 101 for cooperating with the two photoelectric switches 11 are provided on both sides of the light shielding plate 10. For example, when the light shielding plate 10 moves, when the right baffle 101 moves and is inserted into the groove of the right photoelectric switch 11, the photoelectric switch 11 is triggered, which indicates that the light shielding plate 10 completely covers the light guide port 14; the movement of the left shutter 101 inserted into the recess of the left photoelectric switch 11 indicates that the shutter 10 is fully opened. Referring to fig. 2 and 3, the light shielding plate 10 in fig. 2 is closed to cover the light guide port 14; in fig. 3, the light shielding plate 10 is opened and does not cover the light guide opening 14.
Wherein, the light shielding plate cover plate 19 is provided with a first opening 190 for communicating the light guide port 14 and the detection port, and the first opening 190 is provided with the optical filter 18. The optical filter 18 can filter stray light and improve detection precision in the detection process.
The light shielding plate mounting seat 20 is provided with a second opening 201 for communicating the light guide port 14 and the first opening 190. The photomultiplier tube 13 is disposed below the light guide port 14. The light emitted by the sample on the cambered surface light-transmitting element 7 sequentially passes through the cambered surface light-transmitting element 7 on the detection port, the optical filter 18 on the first opening 190, the second opening 201 and the light guide port 14 and then reaches the photomultiplier 13.
The motor 4, the photoelectric switch 11, the photomultiplier 13 and the photon counting unit 15 are all connected with a computer control end 16 through cables 17, and power supply and control of relevant components are achieved through the computer control end 16.
The utility model discloses a workflow in the embodiment does: firstly, a mouse 8 (sample) is pasted on a proper position of the cambered surface light-transmitting element 7, and the pasting area of the mouse 8 is increased through a lens, so that the detectable area of the photomultiplier 13 is increased. Then the motor 4 is started to drive the prime mover of the rocker mechanism 5 to move, and the rocker mechanism driven piece 22 is driven to push the shading plate 10 to move leftwards, so that the shading plate 10 is opened; then, the photomultiplier tube 13 and the photon counting unit 15 detect and count fluorescence in the mouse 8, and input the detection result data into the computer control terminal 16. After detection is finished, the motor 4 drives the rocker mechanism 5 to close the light screen 10, the photomultiplier 13 is protected, and then the mouse 8 is taken out and the device is cleaned.
While the embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields where the invention is suitable, and further modifications may readily be made by those skilled in the art, and the invention is therefore not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (10)
1. A weak light detection device based on a photomultiplier is characterized by comprising: the sealed box body, set up in base in the sealed box body, set up in photomultiplier and photoelectric counting unit in the base, set up in protection on the base moves a mechanism, set up in cambered surface printing opacity component on the detection mouth that sealed box body upper portion was seted up, set up in base upper portion and with the leaded light mouth that detects the mouth intercommunication and with the control end that photomultiplier and photoelectric counting unit all are connected.
2. The apparatus of claim 1, wherein the sealed box is disposed on a bottom plate, the base comprises a side supporting plate connected to the bottom plate and a mounting plate connected to an upper portion of the side supporting plate, and the light guide opening is formed in a middle portion of the mounting plate.
3. The apparatus according to claim 2, wherein the protective sliding mechanism comprises a light shielding plate mounting seat disposed on the mounting plate, a light shielding plate slidably disposed in a light shielding plate sliding slot formed on the light shielding plate mounting seat, a light shielding plate cover plate covering the light shielding plate, and a rocker driving mechanism for driving the light shielding plate to slide.
4. The weak light detection device based on the photomultiplier according to claim 3, wherein the rocker driving mechanism includes a motor and a rocker having one end connected to an output shaft of the motor, the other end of the rocker is slidably disposed in a rocker sliding groove formed in the light shielding plate, and the opening direction of the rocker sliding groove is perpendicular to the movement direction of the light shielding plate.
5. The apparatus of claim 3, wherein a pressing rod is further disposed between the light shielding cover plate and the light shielding mounting seat, and a spring is connected between the pressing rod and the light shielding cover plate.
6. The apparatus for detecting weak light based on photomultiplier according to claim 2, wherein the mounting plate is provided with photoelectric switches on both sides thereof in the movement direction of the shutter.
7. The apparatus of claim 3, wherein the light shielding plate has a first opening formed thereon for connecting the light guide opening and the detection opening, and the first opening has a filter disposed thereon.
8. The apparatus according to claim 7, wherein the light shielding plate mounting seat has a second opening for communicating the light guide opening and the first opening.
9. The apparatus for detecting weak light based on photomultiplier according to claim 8, wherein the photomultiplier is disposed below the light guide opening.
10. The apparatus of claim 9, wherein the light emitted from the sample on the light-transmitting cambered element reaches the photomultiplier tube after passing through the light-transmitting cambered element on the detection port, the optical filter on the first opening, the second opening, and the light guide port in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920178543.0U CN210124759U (en) | 2019-02-01 | 2019-02-01 | Weak light detection device based on photomultiplier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920178543.0U CN210124759U (en) | 2019-02-01 | 2019-02-01 | Weak light detection device based on photomultiplier |
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| Publication Number | Publication Date |
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| CN210124759U true CN210124759U (en) | 2020-03-06 |
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| CN201920178543.0U Active CN210124759U (en) | 2019-02-01 | 2019-02-01 | Weak light detection device based on photomultiplier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109998481A (en) * | 2019-02-01 | 2019-07-12 | 中国科学院苏州生物医学工程技术研究所 | Weak light detection device based on photomultiplier tube |
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2019
- 2019-02-01 CN CN201920178543.0U patent/CN210124759U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109998481A (en) * | 2019-02-01 | 2019-07-12 | 中国科学院苏州生物医学工程技术研究所 | Weak light detection device based on photomultiplier tube |
| CN109998481B (en) * | 2019-02-01 | 2024-01-30 | 中国科学院苏州生物医学工程技术研究所 | Weak light detection device based on photomultiplier |
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