An adjustable band ultraviolet sensor

Abstract

The utility model discloses an adjustable wave band's ultraviolet sensor belongs to ultraviolet sensor technical field, a kind of adjustable wave band's ultraviolet sensor, including substrate and packaging shell, the inside of packaging shell is provided with light source cavity, and the inside installation of light source cavity has photosensitive element, wherein, the bottom of photosensitive element is installed with circuit board piece, and circuit board piece is connected with substrate through clamping groove. To solve the problem that sunlight and many artificial light sources contain a large amount of visible light and infrared, and its intensity is much higher than that of ultraviolet, if there is no filter, these non-ultraviolet signals will drown weak ultraviolet signals, leading to serious high reading or even failure, by rotating movable lens, the measuring wave band can be changed, so that one sensor entity has the function equivalent to multiple single-wave band sensors, reduces the hardware cost and overall volume of multi-wave band ultraviolet monitoring equipment, especially suitable for integrated application with limited space.

Description

Technical Field

[0001] This utility model relates to the field of ultraviolet sensor technology, specifically to an adjustable wavelength ultraviolet sensor. Background Technology

[0002] An ultraviolet (UV) sensor is a type of sensor that uses photosensitive elements to convert UV signals into measurable electrical signals through photovoltaic and photoconductive modes.

[0003] Sunlight and many artificial light sources contain a large amount of visible light and infrared radiation, which are much stronger than ultraviolet light. Without filters, these non-ultraviolet signals will drown out the weak ultraviolet signals, resulting in readings that are seriously too high or even malfunction. Utility Model Content

[0004] The purpose of this invention is to provide an adjustable-band ultraviolet sensor. By rotating the movable lens, the measurement band can be changed, so that one sensor entity has the function of multiple single-band sensors. This reduces the hardware cost and overall size of multi-band ultraviolet monitoring equipment, and is particularly suitable for space-constrained integrated applications. It can solve the problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an adjustable-band ultraviolet sensor, comprising a substrate and a packaging shell, wherein a light source cavity is provided inside the packaging shell, and a photosensitive element is installed inside the light source cavity, wherein a circuit board is installed at the bottom of the photosensitive element, the circuit board is connected to the substrate through a slot, and a lens groove is provided on the outer surface of the packaging shell, and a fixed lens is provided inside the lens groove.

[0006] Preferably, a movable lens is installed on the inner side of the fixed lens, and the movable lens and the fixed lens are rotatably connected by an inner rotating shaft.

[0007] Preferably, the movable lens and the fixed lens are located directly above the photosensitive element.

[0008] Preferably, the bottom of the substrate is provided with heat dissipation back grooves, which are arranged in an array.

[0009] Through the above solution, the array-type heat dissipation back grooves designed at the bottom of the substrate greatly increase the heat dissipation surface area in contact with the air, effectively improve the heat convection efficiency, ensure the stability of the internal temperature of the sensor, prevent the increase of dark current of the photosensitive element and circuit drift caused by temperature rise, and ensure the stability of long-term measurement.

[0010] Preferably, insulating support points are installed around the bottom of the substrate, wherein the insulating support points extend to the outside of the heat dissipation back groove.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model allows the measurement band to be changed by rotating the movable lens, enabling a single sensor entity to have the functions of multiple single-band sensors, reducing the hardware cost and overall size of multi-band ultraviolet monitoring equipment, and is particularly suitable for space-constrained integrated applications.

[0013] 2. The present invention provides a dual filtering system consisting of a fixed lens and a movable lens, which, compared to a single-layer filter, can provide a steeper cutoff edge and a higher out-of-band suppression ratio. When measuring UVB, it can more thoroughly filter out the stronger UVA and visible light; when measuring UVA, it can also effectively eliminate the interference of UVB. Attached Figure Description

[0014] Figure 1 This is the overall front view of the present invention;

[0015] Figure 2 This is a schematic diagram of the overall bottom structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the overall cross-sectional structure of this utility model.

[0017] In the diagram: 1. Substrate; 2. Encapsulation housing; 3. Photosensitive element; 101. Heat dissipation back groove; 102. Insulation support; 201. Fixed lens; 202. Movable lens; 203. Lens slot; 204. Light source cavity; 2011. Inner rotating shaft; 301. Circuit board component. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] To address the issue that sunlight and many artificial light sources contain large amounts of visible and infrared light, whose intensity is far higher than ultraviolet light, and that without filters, these non-ultraviolet signals would drown out the weak ultraviolet signals, leading to severely inflated readings or even system failure; please refer to... Figure 1-3 The present invention provides the following solution:

[0020] An adjustable-band ultraviolet sensor includes a substrate 1 and a housing 2. The housing 2 has a light source cavity 204 inside, and a photosensitive element 3 is installed inside the light source cavity 204. A circuit board 301 is installed at the bottom of the photosensitive element 3. The circuit board 301 is connected to the substrate 1 through a slot. A lens groove 203 is provided on the outer surface of the housing 2, and a fixed lens 201 is provided inside the lens groove 203.

[0021] In this embodiment, ambient light first penetrates the movable lens 202. Both the movable lens and the fixed lens 201 are made of special ultraviolet optical material substrate and are coated with a precision interference filter film. When light enters, the lens itself will perform initial screening of the broadband light, absorbing or reflecting most of the visible light and infrared light that are unrelated to the target ultraviolet band.

[0022] After being modulated by both the fixed lens 201 and the movable lens 202, only ultraviolet light of the target wavelength can efficiently pass through and enter the light source cavity 204. The cavity is coated with a light-absorbing material to reduce internal stray reflections. The pure ultraviolet signal is precisely captured by the photosensitive element 3 (such as a photodiode or photomultiplier tube) directly below. The photosensitive element 3 converts the light signal into a weak electrical signal.

[0023] A movable lens 202 is installed on the inner side of the fixed lens 201. The movable lens 202 and the fixed lens 201 are rotatably connected by an inner rotating shaft 2011. The movable lens 202 and the fixed lens 201 are located directly above the photosensitive element 3. A heat dissipation back groove 101 is provided at the bottom of the substrate 1. The heat dissipation back groove 101 is arranged in an array. Insulation point supports 102 are installed around the bottom of the substrate 1. The insulation point supports 102 extend to the outside of the heat dissipation back groove 101.

[0024] In this embodiment, the movable lens 202 can rotate relative to the fixed lens 201 via the inner rotation shaft 2011. The interference filter films coated on the surfaces of both lenses are not all-through. When the movable lens 202 is rotated, the incident angle and optical path relationship of the incident light in the filter film system of the two lenses are changed. By adjusting the angle of the movable lens 202, the peak transmission wavelength of the lens combination can be continuously or sequentially switched within the UVA 315-400nm and UVB 280-315nm or narrow-band ultraviolet range.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An adjustable-band ultraviolet sensor, characterized in that, The package includes a substrate (1) and a package housing (2). The package housing (2) has a light source cavity (204) inside, and a photosensitive element (3) is installed inside the light source cavity (204). A circuit board (301) is installed at the bottom of the photosensitive element (3). The circuit board (301) is connected to the substrate (1) through a slot. A lens groove (203) is provided on the outer surface of the package housing (2). A fixed lens (201) is provided inside the lens groove (203).

2. The adjustable-band ultraviolet sensor according to claim 1, characterized in that: A movable lens (202) is installed on the inner side of the fixed lens (201), and the movable lens (202) and the fixed lens (201) are rotatably connected by an inner rotating shaft (2011).

3. The adjustable-band ultraviolet sensor according to claim 2, characterized in that: The movable lens (202) and the fixed lens (201) are located directly above the photosensitive element (3).

4. The adjustable-band ultraviolet sensor according to claim 1, characterized in that: The bottom of the substrate (1) is provided with a heat dissipation back groove (101), and the heat dissipation back groove (101) is arranged in an array.

5. The adjustable-band ultraviolet sensor according to claim 4, characterized in that: Insulating point supports (102) are installed around the bottom of the substrate (1), wherein the insulating point supports (102) extend to the outside of the heat dissipation back groove (101).

Images