Insect trap and method
An insect trap and a method of using the same. The insect trap includes a housing. The insect trap also includes a glue board receiving space located inside the housing. The insect trap further includes one or more light sources for attracting insects into the housing. The insect trap also includes a camera having a lens. The lens has a front element. The camera is positioned to capture images of a glue board when the glue board is received in the glue board receiving space. There is no line of sight between the or each light source and the front element of the lens. This may prevent light from the or each light source reaching the front element directly. The method can include using an image captured by the camera to determine that a glue board received in the glue board receiving space needs to be replaced.
1. An insect trap comprising:
a housing;
a glue board receiving space located inside the housing;
a first light source and a second light source for attracting insects into the housing; and
a camera having a lens with a focal length in the range 1 mm≤f≤18 mm,
the lens having a front element, wherein the camera is positioned to capture images of a glue board when said glue board is received in the glue board receiving space, wherein the light received by the lens of the camera for capturing images of the glue board comprises light from the first and second light sources reflected from the glue board;
wherein there is no line of sight between each of the first and second light sources and the front element of the lens, for preventing light from each of the first and second light sources from reaching the front element directly;
wherein the first light source is configured to illuminate a first portion of the glue board, the second light source is configured to illuminate a second portion of the glue board separate from the first portion, and the first and second light sources are configured to simultaneously illuminate a third portion of the glue board separate from the first and second portions.
2. The insect trap of claim 1 , wherein each of the first and second light sources is located a greater distance away from the glue board receiving space, along a direction substantially parallel to an optical axis of the lens, than a front surface of the front element of the lens.
3. The insect trap of claim 1 , further comprising a surface located inside the housing, wherein the surface faces the glue board receiving space, and wherein the lens of the camera is mounted in an opening in the surface.
4. The insect trap of claim 3 , wherein said surface located inside the housing is a surface of an enclosure containing said camera and one or more further electronic components of the insect trap, and wherein the first and second light sources are located outside said enclosure.
5. The insect trap of claim 1 , wherein the glue board receiving space substantially fills a field of view of the camera.
6. The insect trap of claim 1 , wherein an optical axis of the lens is oriented substantially parallel to a surface normal of the glue board when the glue board is received in the glue board receiving space.
7. The insect trap of claim 1 , wherein a distance between a front surface of the front element and the glue board receiving space, along an optical axis of the lens, is in the range 50 mm≤d≤200 mm.
8. The insect trap of claim 1 , wherein the lens has a focal length in the range 2 mm≤f≤12 mm.
9. The insect trap of claim 1 , wherein the lens is a fisheye lens.
10. The insect trap of claim 1 , wherein each of the first and second light sources comprises a fluorescent tube.
11. The insect trap of claim 10 , wherein a longitudinal axis of each fluorescent tube is oriented substantially parallel to a plane containing the glue board receiving space.
12. The insect trap of claim 1 , wherein each of the first and second light sources comprises a light emitting diode.
13. The insect trap of claim 1 , wherein one or more surfaces located inside the housing are anti-reflective surfaces.
14. The insect trap of claim 1 , wherein each of the first and second light sources is configured to emit ultraviolet light having a peak wavelength of around 368 nm.
15. A method of using an insect trap comprising:
providing a housing including a glue board receiving space located inside the housing;
providing a first light source and a second light source for attracting insects into the housing;
placing a glue board in the glue board receiving space;
providing a camera having a lens with a focal length in the range 1 mm≤f≤18 mm, the lens having a front element, wherein the camera is positioned to capture images of the glue board when the glue board is received in the glue board receiving space, wherein the light received by the lens of the camera for capturing images of the glue board comprises light from the first and second light sources reflected from the glue board,
wherein there is no line of sight between the first and second light sources and the front element of the lens, for preventing light from the one or more light sources from reaching the front element directly,
wherein the first light source is configured to illuminate a first portion of the glue board, the second light source is configured to illuminate a second portion of the glue board separate from the first portion, and the first and second light sources are configured to simultaneously illuminate a third portion of the glue board separate from the first and second portions;
using an image captured by the camera to determine that the glue board received in the glue board receiving space needs to be replaced; and
replacing the glue board.