CN217083977U

CN217083977U - Human body infrared detector

Info

Publication number: CN217083977U
Application number: CN202220730596.0U
Authority: CN
Inventors: 熊晓辰
Original assignee: Wuxi Aiwei Sensor Technology Co ltd
Current assignee: Wuxi Aiwei Sensor Technology Co ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2022-07-29
Anticipated expiration: 2032-03-30

Abstract

The utility model relates to a sensor, especially a human infrared detector, including pyroelectric sensor and first fresnel lens, first fresnel lens is located pyroelectric sensor's top still includes: the first Fresnel lens is arranged on the top of the mounting shell; a control board mounted inside the mounting case, the pyroelectric sensor being mounted on the control board; the thermopile sensor is arranged on the control board and is positioned on one side of the pyroelectric sensor; and the second Fresnel lens is arranged at the top of the mounting shell and is positioned above the thermopile sensor. The human body infrared detector detects a static human body through the thermopile to realize human body existence detection in an induction range, has the advantages of simple and compact structure, low cost and convenient installation, and can detect a dead angle-free detection with a detection visual angle of 360 degrees in a 120-degree horizontal area.

Description

Human body infrared detector

Technical Field

The utility model relates to a sensor, especially a human infrared detector.

Background

With the development of science and technology, people have more and more requirements on intellectualization; concepts of smart homes and smart buildings gradually enter the public visual field and become trending; the human body intelligent inductive switch is the first step of intellectualization, and can be linked with an electric lamp, an alarm, an air conditioner and the like to realize intelligent control, thereby realizing the purposes of energy conservation, environmental protection, convenient management and the like, being suitable for various industrial places, having important social and economic benefits and laying a solid foundation for the development of the internet of things.

Most of human infrared detectors existing in the current market are passive infrared sensing based on Pyroelectric (PIR), the sensitivity of the sensor is high, the suitable Fresnel lens sensing area is large, and the sensor is widely favored, but the biggest defect of the sensor is that: for a person who is within the sensing range but remains in a stationary state, sensing cannot be achieved, i.e., the person in the stationary state cannot be detected. This is risky or not applicable in some application scenarios. Based on this, detectors with double techniques such as pyroelectric heating, microwave and ultrasonic wave are produced in the market, and the microwave mode utilizes the Doppler effect generated by human body movement and can only detect the moving human body. The ultrasonic mode can realize human body static detection by using distance detection, but the mode has high cost, is not beneficial to product popularization and is not suitable for common household and other places.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problem, the utility model provides a human infrared detector that simple structure, with low costs, detection accuracy are high, concrete technical scheme is:

the utility model provides a human infrared detector, includes pyroelectric sensor and first fresnel lens, first fresnel lens is located pyroelectric sensor's top still includes: the first Fresnel lens is arranged on the top of the mounting shell; a control board mounted inside the mounting case, the pyroelectric sensor being mounted on the control board; the thermopile sensor is arranged on the control board and is positioned on one side of the pyroelectric sensor; and the second Fresnel lens is arranged at the top of the mounting shell and is positioned above the thermopile sensor.

Preferably, the pyroelectric sensor and the thermopile sensor are symmetrically arranged.

Preferably, the thermopile sensor is located at a short edge end of the pyroelectric sensor.

Furthermore, the edge distance between the pyroelectric sensor and the thermopile sensor is 0.1 mm-0.5 mm.

Preferably, the first fresnel lens and the second fresnel lens are wide-angle hemispherical fresnel lenses and are respectively sleeved on the pyroelectric sensor and the thermopile sensor.

Preferably, the pyroelectric sensor is a binary sensor.

Preferably, the thermopile sensor is an array type thermopile chip sensor.

Compared with the prior art the utility model discloses following beneficial effect has:

the utility model provides a pair of human infrared detector passes through fresnel lens and focuses on human infrared signal in pyroelectric sensor and thermopile sensor, and the thermopile can compensate the unable human defect that detects of pyroelectric to really realize that human existence formula detects in the response range. The adopted thermopile sensor is an array chip series signal, so that the output signal can be improved, the detection sensitivity and accuracy can be improved, and the detection accuracy can reach 99.9%; the device has the advantages of simple and compact structure, low cost, convenient installation and no dead angle detection of 360 degrees in a horizontal area with a detection field angle of 120 degrees.

Drawings

FIG. 1 is a schematic structural diagram of a human body infrared detector;

FIG. 2 is a schematic structural view after the upper cover is hidden;

fig. 3 is a schematic view of a detection field of view of a human body infrared detector.

The reference numerals in the figures mean:

1. an upper cover; 2. a first Fresnel lens; 3. a second Fresnel lens; 4. a lower cover; 5. a control panel; 6. a pyroelectric sensor; 7. a thermopile sensor.

Detailed Description

The present invention will now be further described with reference to the accompanying drawings.

Example one

As shown in fig. 1 to 3, a human body infrared detector includes a pyroelectric sensor 6, a first fresnel lens 2, a mounting case, a control board 5, a thermopile sensor 7, and a second fresnel lens 3.

The mounting shell comprises an upper cover 1 and a lower cover 4, a mounting hole is formed in the bottom of the lower cover 4, and the mounting hole is used for fixing a human body infrared detector. The upper cover 1 and the lower cover 4 are connected through the buckles and the clamping grooves, so that the assembly and disassembly are convenient, and the human body infrared detector can be conveniently installed on a wall, vertically installed and horizontally installed. Control panel 5 is fixed on lower cover 4, and control panel 5 is the PCB circuit board, and thermopile sensor 7 and pyroelectric sensor 6 are all installed on control panel 5 to the symmetry sets up, and wherein, thermopile sensor 7 is located pyroelectric sensor 6's short edge, and pyroelectric sensor 6 is 0.1mm ~ 0.5mm with pyroelectric sensor 7's marginal distance. The first Fresnel lens 2 and the second Fresnel lens 3 are both mounted on the upper cover 1 and are respectively positioned right above the pyroelectric sensor 6 and the thermopile sensor 7, and are aligned in the center, and the infrared radiation energy of the human body is collected through the Fresnel lenses.

The pyroelectric sensor 6 and the thermopile sensor 7 collect human body infrared radiation energy through the first Fresnel lens 2 and the second Fresnel lens 3 respectively. When the pyroelectric sensor 6 outputs high and low level pulse signals, it can be judged that a person is in a detection area and the person is moving; when the output of the pyroelectric sensor is continuously low level, it indicates that no person exists in the detection area or that a person exists in a static state, and when the output of the thermopile sensor 7 is high level, it indicates that a person exists in the detection area. The thermopile sensor 7 can make up the defect that the pyroelectric sensor 6 cannot detect a static human body, so that the human body existence detection in the sensing range is really realized.

Example two

On the basis of the first embodiment, as shown in fig. 1 to 3, the first fresnel lens 2 and the second fresnel lens 3 are both wide-angle hemispherical fresnel lenses, the first fresnel lens 2 is sleeved on the pyroelectric sensor 6 and is aligned with the center thereof, and the second fresnel lens 3 is sleeved on the thermopile sensor 7 and is aligned with the center thereof. The wide-angle hemispherical Fresnel lens is adopted, and the sensor is sleeved with the wide-angle hemispherical Fresnel lens, so that the detection energy is more concentrated, the effective detection field angle is larger, the detection field angle of 120 degrees is realized, and the detection of a horizontal area of 360 degrees without dead angles is realized.

EXAMPLE III

In addition to any of the above embodiments, as shown in fig. 1 to 3, in order to improve the detection sensitivity, the pyroelectric sensor 6 is a binary sensor. The thermopile sensor 7 is an array thermopile chip sensor, which can adopt 2 x 2 thermopile chips, and multiple chips are connected in series by signals, thereby improving output signals and increasing detection sensitivity and accuracy.

The human body infrared detector provided by the embodiment has the advantages of large field angle, simple structure, convenience in installation, high response rate, adaptability to different environments and high detection accuracy.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the claims of the present invention.

Claims

1. The utility model provides a human infrared detector, includes pyroelectric sensor (6) and first fresnel lens (2), first fresnel lens (2) are located pyroelectric sensor's (6) top, its characterized in that still includes:

the first Fresnel lens (2) is arranged on the top of the mounting shell;

a control board (5), the control board (5) being mounted inside the mounting housing, the pyroelectric sensor (6) being mounted on the control board (5);

a thermopile sensor (7), wherein the thermopile sensor (7) is installed on the control board (5) and is positioned at one side of the pyroelectric sensor (6); and

and the second Fresnel lens (3) is arranged at the top of the mounting shell and is positioned above the thermopile sensor (7).

2. The human body infrared detector according to claim 1, characterized in that the pyroelectric sensor (6) is arranged symmetrically to the thermopile sensor (7).

3. The human body infrared detector according to claim 1, characterized in that the thermopile sensor (7) is located at the short side end of the pyroelectric sensor (6).

4. The human body infrared detector according to claim 3, characterized in that the edge distance between the pyroelectric sensor (6) and the thermopile sensor (7) is 0.1 mm-0.5 mm.

5. The human body infrared detector according to any one of claims 1 to 4, characterized in that the first Fresnel lens (2) and the second Fresnel lens (3) are both wide-angle hemispherical Fresnel lenses and are respectively sleeved on the pyroelectric sensor (6) and the thermopile sensor (7).

6. The human infrared detector according to any of the claims 1 to 4, characterized in that the pyroelectric sensor (6) is a binary sensor.

7. The human body infrared detector according to any one of claims 1 to 4, characterized in that the thermopile sensor (7) is an array thermopile chip sensor.