Infrared sensing system

Abstract

An infrared sensing system includes an infrared sensing element, an adjusting unit movable between a first position and a second position, a lens disposed between the infrared sensing element and the adjusting unit, and a processing unit electrically connected to the infrared sensing element and the adjusting unit. When the adjusting unit is in the second position, the adjusting unit limits a field of view formed by the infrared sensing element, the lens, and the adjusting unit.

Description

Technical Field

[0001] This invention relates to an infrared sensing system, and more particularly to an infrared sensing system used to detect humans and pets separately. Background Technology

[0002] A typical infrared sensing system includes a passive infrared sensor (PIR), a Fresnel lens, and a processing unit, forming a field of view. When an object that emits strong infrared radiation, such as a human, approaches the infrared sensing system, the system generates an electrical signal. The processing unit can then trigger a corresponding control system based on this signal. Infrared sensing systems are widely used in indoor occupant detection, burglar protection, security, energy saving, automatic lighting control, and smart home applications.

[0003] However, when a typical infrared sensing system is designed to detect humans, it fails to detect the signal differences between humans and pets because both emit similar infrared radiation. This results in pets being detected as humans. The detection of pets as humans impacts applications in areas such as indoor occupant detection, burglar prevention, security, energy conservation, automatic lighting control, and smart home technology.

[0004] Therefore, designing an infrared sensing system that can detect humans and pets separately is one of the urgent problems to be solved. Summary of the Invention

[0005] This invention provides an infrared sensing system that can detect humans and pets separately, and can also detect adults, children and pets separately.

[0006] The present invention provides an infrared sensing system, comprising: an infrared sensing element; an adjustment unit movable between a first position and a second position; a first lens disposed between the infrared sensing element and the adjustment unit; and a processing unit electrically connected to the infrared sensing element and the adjustment unit; wherein, when the adjustment unit is located in the second position, the adjustment unit limits the field of view formed by the infrared sensing element, the first lens and the adjustment unit.

[0007] In some embodiments, the adjustment unit is a light-shielding element or a second lens.

[0008] In some embodiments, when the adjustment unit is in the first position, the infrared sensing element, the first lens, and the adjustment unit form a first detection angle; when the adjustment unit is in the second position, the infrared sensing element, the first lens, and the adjustment unit form a second detection angle, which is smaller than the first detection angle.

[0009] In some embodiments, when the adjustment unit is in the first position, the adjustment unit is outside the first detection angle; when the adjustment unit is in the second position, part or all of the adjustment unit is within the first detection angle.

[0010] In some embodiments, the first detection angle is approximately 21.8 degrees; the second detection angle is approximately 16.7 degrees.

[0011] In some embodiments, the infrared sensing element is positioned at a height of approximately 2 meters above the ground.

[0012] In some embodiments, the adjustment unit moves from the second position to the third position. When the adjustment unit is in the third position, the infrared sensing element, the first lens, and the adjustment unit form a third detection angle, which is smaller than the second detection angle.

[0013] In some embodiments, when the adjustment unit is in the first position, the infrared sensing element, the first lens, and the adjustment unit form a first detection distance; when the adjustment unit is in the second position, the infrared sensing element, the first lens, and the adjustment unit form a second detection distance, the second detection distance being greater than the first detection distance.

[0014] In some embodiments, when the adjustment unit is in the second position, part or all of the adjustment unit is located within the first detection angle formed by the infrared sensing element, the first lens, and the adjustment unit.

[0015] In some embodiments, the infrared sensing element is a pyroelectric infrared sensing element.

[0016] In some embodiments, the first lens and the second lens are Fresnel lenses.

[0017] As described above, the infrared sensing system of the present invention can be installed on a wall, a tripod, or a ceiling. Its processing unit can control the infrared sensing element to turn on and control the adjustment unit to a first position. When a human or pet enters the first field of view (e.g., a first detection angle or a first detection distance) of the infrared sensing system, the infrared sensing element generates an electrical signal. The processing unit receives the electrical signal and controls the adjustment unit to a second position, reducing the field of view of the infrared sensing system from the first field of view to a second field of view (e.g., a second detection angle or a second detection distance). If the infrared sensing element continues to generate an electrical signal, the processing unit determines that it is a human; if the infrared sensing element stops generating an electrical signal, the processing unit determines that it is a pet. This facilitates applications in fields such as indoor occupant detection, anti-theft, security protection, energy saving, automatic lighting control, and smart homes.

[0018] Similarly, the adjustment unit of the infrared sensing system of the present invention can also be located in a third position, so that the field of view of the infrared sensing system is reduced from the second field of view to the third field of view (e.g., the third detection angle or the third detection distance), thereby detecting adults, children and pets.

[0019] Furthermore, using a light-shielding element in the adjustment unit can achieve cost savings. Using a second lens in the adjustment unit allows for different configuration options.

[0020] In addition, the infrared sensing element of the infrared sensing system is at a height of meters above the ground, with a first detection angle of 21.8 degrees and a second detection angle of 16.7 degrees, making the infrared sensing system suitable for installation in indoor spaces to detect humans and medium-sized dogs and other pets. Attached Figure Description

[0021] Details of one or more embodiments of the subject matter described herein are set forth in the following drawings and description. Other features, aspects, and advantages of the subject matter of this specification will become apparent from the description, drawings, and claims, wherein:

[0022] Figure 1 This is a schematic diagram of the adjustment unit of the infrared sensing system according to the first embodiment of the present invention located in the first position.

[0023] Figure 2A This is a schematic diagram of the adjustment unit of the infrared sensing system according to the second embodiment of the present invention located in the first position.

[0024] Figure 2B This is a schematic diagram showing the adjustment unit of the infrared sensing system of the second embodiment of the present invention located in the second position.

[0025] Figure 2C This is a schematic diagram showing the adjustment unit of the infrared sensing system of the second embodiment of the present invention located in the third position.

[0026] Figure 3A This is a schematic diagram of the adjustment unit of the infrared sensing system according to the third embodiment of the present invention located in the first position.

[0027] Figure 3B This is a schematic diagram showing the adjustment unit of the infrared sensing system of the third embodiment of the present invention located in the second position.

[0028] Figure 4A This is a schematic diagram of the adjustment unit of the infrared sensing system according to the fourth embodiment of the present invention located in the first position.

[0029] Figure 4B This is a schematic diagram showing the adjustment unit of the infrared sensing system of the fourth embodiment of the present invention located in the second position.

[0030] The attached figures are labeled as follows:

[0031] 1: Infrared sensing system

[0032] 1A: Infrared sensing system

[0033] 1B: Infrared Sensing System

[0034] 1C: Infrared Sensing System

[0035] 10: Infrared sensing element

[0036] 11: First lens

[0037] 12: Adjustment Unit

[0038] 121: Light-shielding element

[0039] 122: Second Lens

[0040] 13: Processing Unit

[0041] A1: First detection angle

[0042] A2: Second detection angle

[0043] A3: Third Detection Angle

[0044] D1: First detection range

[0045] D2: Second Detection Range

[0046] FV1: First field of view

[0047] FV2: Second field of view

[0048] FV3: Third Field of View

[0049] G: Ground

[0050] H: Height

[0051] P1: First position

[0052] P2: Second position

[0053] P3: Third position

[0054] 91: Humans

[0055] 92: Pets Detailed Implementation

[0056] The detailed description and technical content of the present invention are explained below with reference to the accompanying drawings. However, the drawings are provided for reference and illustration only and are not intended to limit the present invention.

[0057] As used herein, terms such as “first,” “second,” and “third” describe various elements, components, regions, layers, and / or parts, which should not be limited by these terms. These terms are used only to distinguish one element, component, region, layer, or part from another. Unless the context clearly indicates otherwise, the use of terms such as “first,” “second,” and “third” herein does not imply any order or sequence.

[0058] Figure 1 This is a schematic diagram showing the adjustment unit of the infrared sensing system according to the first embodiment of the present invention in a first position. Please refer to... Figure 1 As shown, the infrared sensing system 1 of this embodiment includes an infrared sensing element 10, a first lens 11, an adjustment unit 12, and a processing unit 13.

[0059] The infrared sensing element 10 can detect infrared radiation through photoelectric effect or thermoelectric effect, for example. The infrared sensing element 10 that detects infrared radiation through photoelectric effect can be, for example, a photodiode or a photoresistor, which generates a photoelectric effect by absorbing infrared radiation, thereby producing a change in current or voltage. The infrared sensing element 10 that detects infrared radiation through thermoelectric effect can be, for example, a passive infrared sensor (PIR), which generates a thermoelectric effect by absorbing infrared radiation, thereby producing a change in current or voltage. In this embodiment, the infrared sensing element 10 can be, for example, a pyroelectric infrared sensor, which is also known as a pyroelectric infrared sensor.

[0060] A first lens 11 is disposed on the infrared sensing element 10 and between the infrared sensing element 10 and the adjustment unit 12. The first lens 11 may or may not contact the infrared sensing element 10, and may or may not contact the adjustment unit 12. The infrared sensing element 10, the first lens 11, and the adjustment unit 12 are arranged sequentially in a specific direction, for example, from... Figure 1 The elements are arranged sequentially from left to right. The infrared sensing element 10, the first lens 11, and the adjustment unit 12 are not limited to being arranged on the optical axis. The first lens 11 can be, for example, a spherical lens, an aspherical lens, or a Fresnel lens, which has the function of focusing or diverging infrared light, but this is not a limitation. The Fresnel lens can have multiple concentric annular regions, each region having a specific refraction angle, thereby enabling the Fresnel lens to focus or diverge infrared light. Compared to ordinary lenses, Fresnel lenses have the characteristic of significantly reducing thickness when using large apertures and short focal lengths.

[0061] Adjustment unit 12 can be moved to the first position P1 (reference) Figure 2A , Figure 3A and Figure 4A (as shown) and the second position P2 (reference) Figure 2B , Figure 3B and Figure 4B The adjustment unit 12 can be mounted on a bracket (not shown), which is connected to a motor (not shown), allowing the adjustment unit 12 to be positioned between a first position P1 and a second position P2, but this is not restrictive. When the adjustment unit 12 is in the first position P1, the infrared sensing element 10, the first lens 11, and the adjustment unit 12 can form a first field of view FV1. Figure 1 (Dot matrix marking area). The field of view is the spatial range within which the infrared sensing system 1 can detect infrared light, such as a cone or a square pyramid. When the adjustment unit 12 is in the second position P2, the adjustment unit 12 restricts the field of view formed by the infrared sensing element 10, the first lens 11, and the adjustment unit 12, causing the field of view of the infrared sensing system 1 to shrink from the first field of view FV1 to the second field of view FV2. Figure 1 (Diagonal lines indicate the area). The adjustment unit 12 can limit the field of view by restricting the horizontal detection angle, vertical detection angle, detection distance, or detection space shape. The adjustment unit 12 can be, for example, a light-shielding element 121 (such as...). Figure 2A (as shown) or the second lens 122 (as shown) Figure 3A (as shown), etc., to limit the field of view formed by the infrared sensing element 10, the first lens 11 and the adjustment unit 12.

[0062] The processing unit 13 is electrically connected to the infrared sensing element 10 and the adjustment unit 12. The processing unit 13 can, for example, receive electrical signals generated by the infrared sensing element 10, control the opening and closing of the infrared sensing element 10, and control the position of the adjustment unit 12. The processing unit 13 may include, for example, a digital signal processor (DSP), a programmable logic controller (PLC), a central processing unit (CPU), a microcontroller unit (MCU), a field-programmable gate array (FPGA), or a system-on-a-chip (SoC), etc., but is not limited thereto.

[0063] As described above, the infrared sensing system 1 of this embodiment can be mounted on a wall or tripod. Its processing unit 13 can control the infrared sensing element 10 to turn on and control the adjustment unit 12 to the first position P1. When a human 91 or a pet 92 enters the first field of view FV1 of the infrared sensing system 1, the infrared sensing element 10 generates an electrical signal. The processing unit 13 receives the electrical signal and controls the adjustment unit 12 to the second position P2, causing the field of view of the infrared sensing system 1 to shrink from the first field of view FV1 to the second field of view FV2. If the infrared sensing element 10 continues to generate an electrical signal, the processing unit 13 determines that it is a human 91; if the infrared sensing element 10 stops generating an electrical signal, the processing unit 13 determines that it is a pet 92. Therefore, the infrared sensing system 1 of this invention can detect both humans 91 and pets 92, facilitating applications in indoor occupant sensing, anti-theft, security protection, energy saving, automatic lighting control, and smart home applications.

[0064] Figure 2A This is a schematic diagram of the adjustment unit of the infrared sensing system according to the second embodiment of the present invention located in the first position. Figure 2B This is a schematic diagram showing the adjustment unit of the infrared sensing system of the second embodiment of the present invention located in the second position. Figure 2C This is a schematic diagram showing the adjustment unit of the infrared sensing system according to the second embodiment of the present invention located in the third position. Please refer to... Figure 2A , Figure 2B and Figure 2C As shown, the infrared sensing system 1A of this embodiment includes an infrared sensing element 10, a first lens 11, a light-shielding element 121, and a processing unit 13.

[0065] The infrared sensing element 10, the first lens 11, and the processing unit 13 in this embodiment are similar to those in the first embodiment, and will not be described again here. The difference between the second embodiment and the first embodiment is that the adjustment unit 12 in the second embodiment is a light-shielding element 121.

[0066] The light-shielding element 121 can be mounted on a bracket (not shown), which is connected to a motor (not shown), allowing the light-shielding element 121 to be positioned between a first position P1 and a second position P2, but this is not limiting. The light-shielding element 121 has extremely low transmittance in the infrared band and can block infrared light. The material of the light-shielding element 121 can be, for example, metal or an infrared cutoff filter, but this is not limiting. When the light-shielding element 121 is located in the first position P1, the infrared sensing element 10, the first lens 11, and the light-shielding element 121 can form a first field of view FV1. The first field of view FV1 has a first detection angle A1. When the light-shielding element 121 is located in the second position P2, the light-shielding element 121 blocks the field of view formed by the infrared sensing element 10, the first lens 11, and the light-shielding element 121, causing the field of view of the infrared sensing system 1A to shrink from the first field of view FV1 to the second field of view FV2. The second field of view FV2 has a second detection angle A2. The second detection angle A2 is smaller than the first detection angle A1. The first detection angle A1 can be, for example, 21.8 degrees; the second detection angle A2 can be, for example, 16.7 degrees. The height H of the infrared sensing element 10 above the ground G can be, for example, 2 meters. The infrared sensing element 10 can be mounted on a wall or a tripod, such that the vertical distance between the infrared sensing element 10 and the ground G is 2 meters.

[0067] In some embodiments, the adjustment unit 12 can be moved from the second position P2 to the third position P3. When the adjustment unit 12 is in the third position P3, the infrared sensing element 10, the first lens 11, and the adjustment unit 12 form a third detection angle A3, which is smaller than the second detection angle A2. In other words, the adjustment unit 12 can be moved to the first position P1, the second position P2, or the third position P3, so that the field of view corresponding to the infrared sensing system 1A is the first field of view FV1, the second field of view FV2, and the third field of view FV3, and the detection angle corresponding to the infrared sensing system 1A is the first detection angle A1, the second detection angle A2, and the third detection angle A3.

[0068] In some embodiments, when the light-shielding element 121 is located at the first position P1, the light-shielding element 121 is outside the first detection angle A1; when the light-shielding element 121 is located at the second position P2, part or all of the light-shielding element 121 is within the first detection angle A1. For example, when the light-shielding element 121 is located at the first position P1, the light-shielding element 121 does not block the first field of view FV1 of the infrared sensing system 1A; when the light-shielding element 121 is located at the second position P2, part or all of the light-shielding element 121 can block the first field of view FV1 of the infrared sensing system 1A to form a second field of view FV2.

[0069] As described above, the infrared sensing system 1A of this embodiment has the same functions as the first embodiment. Furthermore, using a light-shielding element 121 in the adjustment unit 12 can achieve cost savings and increase the variety of configuration options. Additionally, the infrared sensing element 10 of the infrared sensing system 1A is 2 meters above the ground G at a height H, with a first detection angle A1 of 21.8 degrees and a second detection angle A2 of 16.7 degrees, making the infrared sensing system 1A suitable for installation in indoor spaces to detect humans 91 and pets such as medium-sized dogs 92. Moreover, the infrared sensing system 1A can have a first detection angle A1, a second detection angle A2, and a third detection angle A3, for example, capable of distinguishing between adults, children, and pets 92, facilitating applications in areas such as indoor occupant detection, anti-theft, security protection, energy saving, automatic lighting control, and smart homes.

[0070] Figure 3A This is a schematic diagram of the adjustment unit of the infrared sensing system according to the third embodiment of the present invention located in the first position. Figure 3B This is a schematic diagram showing the adjustment unit of the infrared sensing system according to the third embodiment of the present invention located in the second position. Please refer to... Figure 3A and Figure 3B As shown, the infrared sensing system 1B of this embodiment includes an infrared sensing element 10, a first lens 11, a second lens 122, and a processing unit 13.

[0071] The infrared sensing element 10, the first lens 11, and the processing unit 13 in this embodiment are similar to those in the first embodiment, and will not be described again here. The difference between the third embodiment and the first embodiment is that the adjustment unit 12 in the third embodiment is the second lens 122.

[0072] The second lens 122 can be mounted on a bracket (not shown), which is connected to a motor (not shown), allowing the second lens 122 to be positioned between a first position P1 and a second position P2, but without limitation. When the second lens 122 is in the first position P1, the infrared sensing element 10, the first lens 11, and the second lens 122 can form a first field of view FV1. The first field of view FV1 has a first detection angle A1. When the second lens 122 is in the second position P2, the second lens 122 limits the field of view formed by the infrared sensing element 10, the first lens 11, and the second lens 122 by refracting infrared light, causing the field of view of the infrared sensing system 1B to shrink from the first field of view FV1 to the second field of view FV2. The second field of view FV2 has a second detection angle A2. The second detection angle A2 is smaller than the first detection angle A1. The upper edge of the second detection angle A2 can be flush with or not flush with the upper edge of the first detection angle A1 (e.g., Figure 3B (As shown). The second lens 122 can be, for example, a spherical lens, an aspherical lens, or a Fresnel lens, a lens that has the function of focusing or diverging infrared light, but it is not limited thereto.

[0073] Therefore, the infrared sensing system 1B of this embodiment has the same functions as the first embodiment. Furthermore, by using the second lens 122 in the adjustment unit 12, different configuration options can be added to facilitate applications in fields such as indoor occupant sensing, anti-theft, security protection, energy saving, automatic lighting control, and smart homes.

[0074] Figure 4A This is a schematic diagram of the adjustment unit of the infrared sensing system according to the fourth embodiment of the present invention located in the first position. Figure 4B This is a schematic diagram showing the adjustment unit of the infrared sensing system according to the fourth embodiment of the present invention located in the second position. Please refer to... Figure 4A and Figure 4B As shown, the infrared sensing system 1C of this embodiment includes an infrared sensing element 10, a first lens 11, a second lens 122, and a processing unit 13.

[0075] The difference between the fourth embodiment and the third embodiment is that, in the third embodiment, the second lens 122 adjusts the infrared sensing system 1B by moving to the first position P1 or the second position P2 (e.g., Figure 3A and Figure 3B The detection angle is shown in the figure, and the second lens 122 of the fourth embodiment adjusts the detection distance of the infrared sensing system 1C by moving to the first position P1 or the second position P2.

[0076] When the second lens 122 is located at the first position P1, the infrared sensing element 10, the first lens 11, and the second lens 122 form a first detection distance D1. When the second lens 122 is located at the second position P2, the infrared sensing element 10, the first lens 11, and the second lens 122 form a second detection distance D2. For example, the second position P2 of the second lens 122 is located on the optical axis of the infrared sensing system 1C. When the second lens 122 is located at the first position P1, the first lens 11 makes the detection distance of the infrared sensing system 1C the first detection distance D1, while the second lens 122 does not affect the optical path of the infrared sensing system 1C. When the second lens 122 is located at the second position P2, the first lens 11 and the second lens 122 form an equivalent focal length, making the detection distance of the infrared sensing system 1C the second detection distance D2. The second detection distance D2 can, for example, be greater than the first detection distance D1.

[0077] In some embodiments, when the second lens 122 is in the second position P2, part or all of the second lens 122 is within the first detection angle A1 formed by the infrared sensing element 10, the first lens 11, and the second lens 122. In other words, when the second lens 122 is in the second position P2, it can refract infrared light to the first lens 11 and into the infrared sensing element 10. This achieves the effect of adjusting the focal length.

[0078] As described above, the infrared sensing system 1C of this embodiment can be installed on the ceiling. Its processing unit 13 can control the infrared sensing element 10 to turn on and control the second lens 122 to the first position P1. When a human 91 or a pet 92 enters the first detection distance D1 of the infrared sensing system 1C, the infrared sensing element 10 can generate an electrical signal. The processing unit 13 receives the electrical signal and controls the second lens 122 to the second position P2, so that the detection distance of the infrared sensing system 1C changes from the first detection distance D1 to the second detection distance D2. If the infrared sensing element 10 still generates an electrical signal, it is determined to be a human 91; if the infrared sensing element 10 stops generating an electrical signal, it is determined to be a pet 92. In this way, the infrared sensing system 1C of the present invention can detect both humans 91 and pets 92, which is beneficial for applications in the fields of indoor personnel sensing, anti-theft, security protection, energy saving, automatic lighting control, and smart homes.

[0079] In summary, the infrared sensing system of the present invention can be installed on a wall, a tripod, or a ceiling. Its processing unit can control the infrared sensing element to turn on and control the adjustment unit to a first position. When a human or pet enters the first field of view (e.g., a first detection angle or a first detection distance) of the infrared sensing system, the infrared sensing element generates an electrical signal. The processing unit receives the electrical signal and controls the adjustment unit to a second position, reducing the field of view of the infrared sensing system from the first field of view to a second field of view (e.g., a second detection angle or a second detection distance). If the infrared sensing element continues to generate an electrical signal, the processing unit determines that it is a human; if the infrared sensing element stops generating an electrical signal, the processing unit determines that it is a pet. This facilitates applications in fields such as indoor occupant detection, anti-theft, security protection, energy saving, automatic lighting control, and smart homes.

[0080] Similarly, the adjustment unit of the infrared sensing system of the present invention can also be located in a third position, so that the field of view of the infrared sensing system is reduced from the second field of view to the third field of view (e.g., the third detection angle or the third detection distance), thereby detecting adults, children and pets.

[0081] Furthermore, using a light-shielding element in the adjustment unit can achieve cost savings. Using a second lens in the adjustment unit allows for different configuration options.

[0082] In addition, the infrared sensing element of the infrared sensing system is at a height of meters above the ground, with a first detection angle of 21.8 degrees and a second detection angle of 16.7 degrees, making the infrared sensing system suitable for installation in indoor spaces to detect humans and medium-sized dogs and other pets.

[0083] Unless otherwise defined, terms such as "substantially" and "approximately" are used to describe and narrate minor changes. When used in connection with an event or situation, these terms may include the exact moment the event or situation occurred, or an approximate point in time. For example, when used in connection with a numerical value, these terms may include a specific range of variation that is less than or equal to that numerical value.

[0084] The foregoing has outlined components of several embodiments to enable those skilled in the art to better understand the concepts of the embodiments of the present invention. Those skilled in the art should understand that other processes and structures can be designed or modified based on the embodiments of the present invention to achieve the same purpose and / or benefits as the embodiments described herein. Those skilled in the art should also understand that these equivalent structures do not depart from the spirit and scope of the present invention, and various changes, substitutions, and other options can be made therein without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of protection of the claimed patent.

Claims

1. An infrared sensing system, characterized in that, include: An infrared sensing element; An adjustment unit that can move between a first position and a second position; A first lens is disposed between the infrared sensing element and the adjustment unit; and A processing unit is electrically connected to the infrared sensing element and the adjustment unit; When the adjustment unit is in the second position, it limits the field of view formed by the infrared sensing element, the first lens, and the adjustment unit.

2. The infrared sensing system as described in claim 1, characterized in that, The adjustment unit is either a light-shielding element or a second lens.

3. The infrared sensing system as described in claim 1, characterized in that, When the adjustment unit is in the first position, the infrared sensing element, the first lens, and the adjustment unit form a first detection angle. When the adjustment unit is in the second position, the infrared sensing element, the first lens, and the adjustment unit form a second detection angle, which is smaller than the first detection angle.

4. The infrared sensing system as described in claim 3, characterized in that, When the adjustment unit is in the first position, the adjustment unit is outside the first detection angle; When the adjustment unit is in the second position, part or all of the adjustment unit is within the first detection angle.

5. The infrared sensing system as described in claim 4, characterized in that, The first detection angle is approximately 21.8 degrees; the second detection angle is approximately 16.7 degrees.

6. The infrared sensing system as described in claim 5, characterized in that, The infrared sensing element is located at a height of approximately 2 meters above the ground.

7. The infrared sensing system as described in claim 3, characterized in that, The adjustment unit moves from the second position to a third position. When the adjustment unit is in the third position, the infrared sensing element, the first lens and the adjustment unit form a third detection angle, which is smaller than the second detection angle.

8. The infrared sensing system as described in claim 1, characterized in that, When the adjustment unit is in the first position, the infrared sensing element, the first lens, and the adjustment unit form a first detection distance. When the adjustment unit is in the second position, the infrared sensing element, the first lens, and the adjustment unit form a second detection distance, which is greater than the first detection distance.

9. The infrared sensing system as described in claim 8, characterized in that, When the adjustment unit is in the second position, part or all of the adjustment unit is located within the infrared sensing element, the first lens, and the area forming a first detection angle.

10. The infrared sensing system as described in claim 1, characterized in that, The infrared sensing element is a pyroelectric infrared sensing element.

11. The infrared sensing system as described in claim 2, characterized in that, The first lens and the second lens are Fresnel lenses.

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