Shutter device of photomultiplier
By using sliding control of the housing, lens barrel and light shield in the photomultiplier tube shutter device, the performance attenuation and signal saturation problems caused by ambient light during the movement of the photomultiplier tube are solved, and the equipment protection and detection sensitivity are achieved Keep sexually.
Patent Information
- Application Number
- CN202420728011.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-10
AI Technical Summary
In POCT chemiluminescence immunoassay, exposure to ambient light during movement results in performance attenuation and signal saturation, limiting the ability to respond to high values.
A shutter device including a housing, a lens barrel, a light guide column and a light shielding plate is designed. The sliding of the light shielding plate is controlled by a swing assembly, and the shutter is opened to allow the light signal to pass when necessary. Otherwise, the shutter is closed to isolate the signal and protect the photomultiplier tube. .
It effectively prevents the performance attenuation of the photomultiplier tube when not detected, maintains detection sensitivity and avoids signal saturation, and extends the service life of the equipment.
Smart Images
Figure CN222190626U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chemiluminescent immunoassay, in particular to a shutter device of a photomultiplier tube. Background Art
[0002] In the field of POCT chemiluminescent immunoassay, the core detection device is the photomultiplier tube (PMT), which detects single photons and transmits them to the amplifier, where they are amplified by high-voltage current. The amplifier converts analog current into digital current, and the digital current transmits the luminescent signal via the RS232 data line to the central control computer for calculation to obtain clinical results.
[0003] The photomultiplier tube uses the fact that when light shines on a light-sensitive metal (such as selenium), its energy can be completely absorbed by an electron in the metal. After absorbing the energy of the photon, the electron overcomes the gravitational force of the nucleus on it and escapes from the metal surface, becoming a photoelectron, forming a photocurrent. The photoelectric effect is divided into photoelectron emission occurring on the surface of an object, also known as the external photoelectric effect. The photomultiplier tube uses the photocathode to absorb photons and produce the external photoelectric effect; emit photoelectrons, which are accelerated by the external electric field and hit the dynode to produce secondary electron emission. The secondary electrons are accelerated by the electric field to reach the next level of dynode to produce more secondary electrons. As the number of dynodes increases, the number of secondary electrons is also doubled, and finally received by the photoanode to generate a current or voltage output signal. Therefore, the photomultiplier tube is a vacuum electronic device that converts weak light signals into electrical signals.
[0004] In POCT applications, due to changes in spatial channel arrangement and reaction modes, the photomultiplier tube must move for detection. During this movement, based on the principle of the photomultiplier tube, if the PMT is exposed to ambient light for a long time, performance degradation will occur. When the signal exceeds the detection range of the photomultiplier tube, saturation will occur and the photon count will decrease. Therefore, the response to high values is limited. Utility Model Content
[0005] The utility model aims to provide a shutter device for a photomultiplier tube, and designs a shutter mechanism, which opens the shutter when needed to read the photon value, and closes the shutter when not needed, so that the photomultiplier tube is in a protection state.
[0006] The technical solution adopted by a shutter device of a photomultiplier tube disclosed in the utility model is:
[0007] A shutter device for a photomultiplier tube comprises a shutter mechanism and a photomultiplier tube body, wherein the shutter mechanism comprises a shell, a lens barrel and a light guide column, wherein one side of the shell is fixedly connected to the photomultiplier tube body, the shell is provided with a avoidance hole corresponding to the photomultiplier tube body, the lens barrel is fixed to the other side of the shell, the light guide column is arranged inside the shell, and the light guide column is arranged corresponding to the lens barrel, and one end of the light guide column extends into the lens barrel, a light shielding plate and a swinging assembly are arranged inside the shell, the light shielding plate is slidably arranged in the shell, and a light through hole is opened on the surface of the light shielding plate, the swinging assembly is fixed inside the shell, and the light shielding plate is movably connected to the swinging assembly.
[0008] As a preferred solution, a sealing ring is provided between the housing and the photomultiplier tube body, and a sealing ring is provided between the housing and the lens barrel.
[0009] As a preferred embodiment, the shell includes a cover plate and a base, the cover plate is fixedly connected to the base, the avoidance hole is provided with a cover plate surface, the avoidance hole, the light guide column and the lens barrel are located on the same axis, a slide groove is provided inside the base, the shading plate is arranged in the slide groove, and a gasket is provided between the cover plate and the slide groove.
[0010] As a preferred solution, a wire hole for threading is provided on one side of the base.
[0011] As a preferred solution, a stopper is provided inside the base near one side of the cover plate, and the stopper is used to limit the installation position of the cover plate.
[0012] As a preferred embodiment, the swing assembly includes a rotating electromagnet and a swing arm, the rotating electromagnet is fixed in the shell, the swing arm is fixedly connected to the rotating electromagnet, the upper end of the shading plate is provided with a swing groove perpendicular to the slide groove, and one end of the swing arm is slidably connected to the swing groove.
[0013] As a preferred solution, a placement groove is provided above the slide groove, the swing assembly is fixed inside the placement groove, and the placement groove is communicated with the slide groove.
[0014] As a preferred solution, the light guide column is fixedly connected to the housing via a protective tube, and the protective tube is sleeved on the outside of the light guide column.
[0015] The utility model discloses a shutter device for a photomultiplier tube with the beneficial effects that: the avoidance hole of the shell is fixedly connected to the light inlet of the photomultiplier tube body, and a light guide column and a lens barrel are arranged on the other side of the shell; when the photomultiplier tube body needs to detect a measured signal, the light shielding plate is driven to slide inside the shell by a swinging component, the light-through hole on the light shielding plate is aligned with the light guide column, so that the light source enters the shell through the light guide column and is then detected by the photomultiplier tube body through the avoidance hole; on the contrary, when the photomultiplier tube body needs to be isolated from external signals, the light shielding plate is driven to slide by the swinging component, so that the light-through hole on the light shielding plate is misaligned with the light guide column, thereby achieving the purpose of shielding the signal, and putting the photomultiplier tube body in a protective state. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The utility model is a structural schematic diagram of a shutter device of a photomultiplier tube.
[0017] Figure 2 The utility model is an exploded view of a shutter device of a photomultiplier tube.
[0018] Figure 3 The utility model is a schematic diagram of the internal structure of a shutter mechanism of a shutter device of a photomultiplier tube. DETAILED DESCRIPTION
[0019] The present invention is further described and illustrated below in conjunction with specific embodiments and accompanying drawings:
[0020] Please refer to Figure 1 , Figure 2 and Figure 3 A shutter device for a photomultiplier tube comprises a shutter mechanism 10 and a photomultiplier tube body 20. The shutter mechanism 10 comprises a shell 11, a lens barrel 12 and a light guide column 13. One side of the shell 11 is fixedly connected to the photomultiplier tube body 20. The shell 11 is provided with a avoidance hole 111 corresponding to the photomultiplier tube body 20. The lens barrel 12 is fixed to the other side of the shell 11. The light guide column 13 is arranged inside the shell 11, and the light guide column 13 is arranged corresponding to the lens barrel 12, and one end of the light guide column 13 extends into the lens barrel 12. A light shielding plate 14 and a swinging assembly 15 are arranged inside the shell 11. The light shielding plate 14 is slidably arranged in the shell 11, and a light through hole 141 is opened on the surface of the light shielding plate 14. The swinging assembly 15 is fixed to the inside of the shell 11, and the light shielding plate 14 is movably connected to the swinging assembly 15.
[0021] The avoidance hole 111 of the housing 11 is fixedly connected to the light inlet of the photomultiplier tube body 20, and a light guide column 13 and a lens barrel 12 are provided on the other side of the housing 11. When the photomultiplier tube body 20 needs to detect the measured signal, the light shielding plate 14 is driven to slide inside the housing 11 through the swing component 15, and the light through hole 141 on the light shielding plate 14 is aligned with the light guide column 13, so that the light source enters the housing 11 through the light guide column 13, and is then detected by the photomultiplier tube body 20 through the avoidance hole 111; conversely, when the photomultiplier tube body 20 needs to be isolated from external signals, the light shielding plate 14 is driven to slide through the swing component 15, so that the light through hole 141 on the light shielding plate 14 is misaligned with the light guide column 13, thereby achieving the purpose of shielding the signal, so that the photomultiplier tube body 20 is in a protective state.
[0022] In the above scheme, a sealing ring 16 is provided between the shell 11 and the photomultiplier tube body 20, and a sealing ring 16 is provided between the shell 11 and the lens barrel 12. The connection between the shell 11 and each component is sealed, and light leakage is avoided to affect the detection sensitivity of the photomultiplier tube body 20.
[0023] The shell 11 includes a cover plate 112 and a base 113, the cover plate 112 is fixedly connected to the base 113, the avoidance hole 111 is opened on the surface of the cover plate 112, the avoidance hole 111, the light guide column 13 and the lens barrel 12 are located on the same axis, a slide groove 114 is provided inside the base 113, the shading plate 14 is arranged in the slide groove 114, and a gasket 17 is provided between the cover plate 112 and the slide groove 114.
[0024] The shell 11 adopts a split cover plate 112 and base 113 structure, which can facilitate the disassembly of the shell 11 and assemble the various components into the shell 11. The avoidance hole 111, the light guide column 13 and the lens barrel 12 are located on the same axis, which can ensure that the signal entering through the lens barrel 12 can be smoothly emitted from the avoidance hole 111, and the slide groove 114 can be used to limit the movement of the shading plate 14 to ensure that the light hole 141 can be smoothly moved to the position corresponding to the light guide column 13. The gasket 17 between the cover plate 112 and the slide groove 114 also serves the purpose of limiting the shading plate 14 to ensure that the shading plate 14 is in the slide groove 114.
[0025] A wire hole 115 for threading is provided on one side of the base 113, and the wire hole 115 is used to electrically connect the swing assembly 14 inside the base 113. A stopper 116 is provided on the side of the base 113 close to the cover 112. The stopper 116 is used to limit the installation position of the cover 11 to avoid excessive squeezing of the shading plate 14 and the gasket 17 in the base 113, and also makes the fixation of the cover 112 more stable.
[0026] The swing assembly 15 includes a rotating electromagnet 151 and a swing arm 152. The rotating electromagnet 151 is fixed in the shell 11. The swing arm 152 is fixedly connected to the rotating electromagnet 151. The upper end of the shading plate 14 is provided with a swing slot 142 perpendicular to the slide slot 114. One end of the swing arm 152 is slidably connected to the swing slot 142.
[0027] The rotating electromagnet 151 is controlled to rotate by energizing it, thereby driving the swing arm 152 to rotate together, and the other end of the swing arm 152 slides in the swing slot 142 of the sunshade 14, and also pushes the sunshade 14 to slide up and down, achieving the purpose of shielding or opening. A placement slot is provided above the slide slot 114, and the swing assembly 15 is fixed inside the placement slot, and the placement slot is connected to the slide slot 114. The placement slot is used to better fix the swing assembly 15 and ensure that the swing assembly 15 is located above the sunshade 14, thereby driving the sunshade 14 to move up and down.
[0028] The light guide column 13 is fixedly connected to the housing 11 via a protective tube 18, which is sleeved on the outside of the light guide column 13 to protect the light guide column 13 to prevent damage to the light guide column 13 caused by the lens barrel 12 and the housing 11 during installation or use.
[0029] The utility model provides a shutter device for a photomultiplier tube, wherein a position avoidance hole of a shell is fixedly connected to a light inlet of a photomultiplier tube body, and a light guide column and a lens barrel are arranged on the other side of the shell. When the photomultiplier tube body needs to detect a measured signal, a light shielding plate is driven to slide inside the shell through a swing component, and the light through hole on the light shielding plate is aligned with the light guide column, so that the light source enters the shell through the light guide column and is then detected by the photomultiplier tube body through the position avoidance hole. Conversely, when the photomultiplier tube body needs to be isolated from external signals, the light shielding plate is driven to slide through the swing component, so that the light through hole on the light shielding plate is misaligned with the light guide column, thereby achieving the purpose of shielding the signal and placing the photomultiplier tube body in a protective state.
[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.
Claims
1. A shutter device for a photomultiplier tube, characterized in that: It includes a shutter mechanism and a photomultiplier tube body, the shutter mechanism includes a shell, a lens barrel and a light guide column, one side of the shell is fixedly connected to the photomultiplier tube body, the shell is provided with a avoidance hole corresponding to the photomultiplier tube body, the lens barrel is fixed to the other side of the shell, the light guide column is arranged inside the shell, and the light guide column is arranged corresponding to the lens barrel, and one end of the light guide column extends into the lens barrel, a light shielding plate and a swinging component are arranged inside the shell, the light shielding plate is slidably arranged in the shell, and a light through hole is opened on the surface of the light shielding plate, the swinging component is fixed inside the shell, and the light shielding plate is movably connected to the swinging component.
2. A shutter device for a photomultiplier tube as claimed in claim 1, characterized in that: A sealing ring is arranged between the shell and the photomultiplier tube body, and a sealing ring is arranged between the shell and the lens barrel.
3. A shutter device for a photomultiplier tube as claimed in claim 2, characterized in that: The shell includes a cover plate and a base, the cover plate is fixedly connected to the base, the avoidance hole is provided with a cover plate surface, the avoidance hole, the light guide column and the lens barrel are located on the same axis, a slide groove is provided inside the base, the shading plate is arranged in the slide groove, and a gasket is provided between the cover plate and the slide groove.
4. A shutter device for a photomultiplier tube as claimed in claim 3, characterized in that: A wire hole for threading is provided on one side of the base.
5. A shutter device for a photomultiplier tube as claimed in claim 4, characterized in that: A stopper is provided inside the base near one side of the cover plate, and the stopper is used to limit the installation position of the cover plate.
6. A shutter device for a photomultiplier tube as claimed in claim 3, characterized in that: The swing assembly includes a rotating electromagnet and a swing arm. The rotating electromagnet is fixed in a shell. The swing arm is fixedly connected to the rotating electromagnet. The upper end of the shading plate is provided with a swing groove perpendicular to the slide groove. One end of the swing arm is slidably connected to the swing groove.
7. A shutter device for a photomultiplier tube as claimed in claim 6, characterized in that: A placement groove is arranged above the slide groove, the swing assembly is fixed inside the placement groove, and the placement groove is communicated with the slide groove.
8. A shutter device for a photomultiplier tube as claimed in claim 1, characterized in that: The light guide column is fixedly connected to the housing through a protective tube, and the protective tube is sleeved outside the light guide column.