WO2019006663A1

WO2019006663A1 - Infrared detector, and infrared detection method

Info

Publication number: WO2019006663A1
Application number: PCT/CN2017/091707
Authority: WO
Inventors: 刘文上; 何江
Original assignee: 深圳通感微电子有限公司
Priority date: 2017-07-04
Filing date: 2017-07-04
Publication date: 2019-01-10
Also published as: CN108513625B; CN108513625A

Abstract

An infrared detector (1, 2, 3), and infrared detection method. The infrared detector (1, 2, 3) comprises an infrared sensor (11, 21, 311, 312), a lens (12, 22, 321, 322) arranged on a sensing side of the infrared sensor (11, 21, 311, 312), and a blocking member (13, 23, 33) provided on an outer side of a sensing side of the lens (12, 22, 321, 322). During a relative movement between the blocking member (13, 23, 33) and the infrared sensor (11, 21, 311, 312), the blocking member (13, 23, 33) passes over and blocks a portion of pixel points of the lens (12, 22, 321, 322) of the infrared sensor (11, 21, 311, 312). The infrared detector (1, 2, 3) and infrared detection method divide a detection region into different sensing regions by means of the pixel points of the lens (12, 22, 321, 322), and enable, by means of the blocking member (13, 23, 33) capable of moving relative to the infrared sensor (11, 21, 311, 312) at the outer side of the lens (12, 22, 321, 322), one same sensing region to receive an infrared signal at different times, such that a motionless human body appears to the infrared sensor (11, 21, 311, 312) to be moving over the different times, and as a result the detection region can be effectively monitored so as to detect a motionless person with a low detection error or miss rate. In addition, the infrared detector (1, 2, 3) has a simple structure, and does not interfere with normal operation of the infrared sensor (11, 21, 311, 312) and the lens (12, 22, 321, 322).

Description

Infrared detector and infrared detection method

Technical field

[0001] The present invention relates to the field of detectors, and in particular, to an infrared detector and an infrared detecting method.

Background technique

[0002] At present, in the field of infrared detection, pyroelectric infrared probes cannot identify a human body in a stationary state. Therefore, if such a probe is used in actual detection, it is easy to ignore a stationary human body, resulting in missed detection or false detection. .

technical problem

The technical problem to be solved by the present invention is to provide an infrared detector and an infrared detecting method for the defects of the human body which are difficult to detect in the prior art.

Problem solution

Technical solution

The technical solution adopted by the present invention to solve the technical problem thereof is as follows: An infrared detector is provided, comprising an infrared sensor and a lens disposed on a sensing side of the infrared sensor, wherein the infrared detector further comprises a baffle on the outer side of the sensing side of the lens, the baffle sweeping over and blocking a portion of the lens pixel of the infrared sensor during relative movement of the baffle and the infrared sensor.

[0005] Preferably, the infrared detector further includes a driving mechanism that drives the shutter to translate or rotate relative to the infrared sensor on a sensing side of the infrared sensor.

[0006] Preferably, the drive mechanism comprises a stepper motor.

[0007] Preferably, the flap comprises an elongated blade.

Preferably, the flap includes a curved blade, and the curved blade includes an arc segment in a section perpendicular to a plane of the infrared sensor.

[0009] Preferably, the curved segment spans the lens across the lens, and the curved surface of the curved segment passes over the outer surface of the lens.

[0010] Preferably, the projection width of the baffle in the plane of the infrared sensor is at least greater than one lens pixel. [0011] Preferably, the infrared detector comprises a first infrared sensor and a second infrared sensor disposed on the same plane; the blocking piece comprises a curved blade, and the curved blade comprises a cross section perpendicular to a plane Two arc segments that are respectively rotated about the same axis of rotation to successively sweep across the first infrared sensor and the second infrared sensor.

[0012] The present invention also provides an infrared detection method, including:

[0013] S100. The infrared sensor receives infrared rays and generates an infrared detection signal.

[0014] S200. Determine whether the infrared detection signal changes with time, and if yes, determine that there is activity in the infrared detection area, otherwise perform the next step;

[0015] S300, driving the infrared sensor to move relative to the blocking piece, generating an infrared detecting signal in the process that the blocking piece passes over and blocks a part of the lens pixel of the infrared sensor, and determines the infrared based on the infrared detecting signal. Whether there is someone in the detection area.

[0016] Preferably, in step S300, it is determined whether the infrared detection signal generated during the process of sweeping and blocking a part of the lens pixel of the infrared sensor changes with time, and if so, determining that the infrared detection area has A person who is stationary, otherwise it is determined that no one is in the infrared detection area.

Advantageous effects of the invention

Beneficial effect

[0017] The implementation of the present invention has the following beneficial effects: In the infrared detector and the infrared detecting method of the present invention, the lens pixel points the detection area into different sensing areas, and a blocking piece that can move relative to the infrared sensor is added outside the lens. The same sensing area can receive infrared signals between different turns, whereby the stationary human body moves to the infrared sensor in different turns, thereby realizing effective monitoring of whether the detecting area has a stationary person, false detection Or the rate of missed detection is low; and the infrared detector has a simple structure and does not affect the normal use of the infrared sensor and the lens.

Brief description of the drawing

DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

1 is a schematic structural view of an infrared detector according to a first embodiment of the present invention;

Figure 2 is a side view of Figure 1;

3 is a schematic structural view of an infrared detector according to a second embodiment of the present invention; Figure 4 is a side view of Figure 3;

5 is a schematic structural view of an infrared detector according to a third embodiment of the present invention;

Figure 6 is a side view of Figure 5;

7 is a flowchart of an infrared detecting method according to a fourth embodiment of the present invention.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

1 and FIG. 2, which shows a schematic structural view of an infrared detector 1 according to a first embodiment of the present invention. The infrared detector 1 includes an infrared sensor 11 and sensing provided on the infrared sensor 11. The side lens 12 and the blocking piece 13 disposed on the outer side of the sensing side of the lens 12, the blocking piece 13 sweeps over and blocks a part of the lens pixel of the infrared sensor 11 during the relative movement of the blocking piece 13 and the infrared sensor 11.

[0028] The lens pixel points the detection area of the infrared sensor 11 into different sensing areas. When the blocking piece 13 does not pass over and blocks a part of the lens pixel of the infrared sensor 11, the infrared radiation received by the infrared sensor 11 is all from the sensing side. (ie, the detection area) can also be considered as the entire detection range of the lens 12. While the shutter 13 sweeps over and blocks a portion of the lens pixel of the infrared sensor 11, a portion of the sensing area is blocked, and the infrared radiation received by the infrared sensor 11 is partially from the detection area and the other part is from the shutter 13. And as the flap 13 passes, the position of the flap 13 blocked in the detection area is changed, so that the same sensing area receives infrared signals between different turns, whereby the infrared sensor 11 receives the different sensing areas from the day. Infrared radiation, while the infrared radiation from the flap 13 does not change. If there is a stationary human body in the detection area, the part of the human body that is blocked during the passage of the flap 13 changes with the daytime, and the stationary human body moves between the different turns for the infrared sensor, thereby judging There are people in the detection area who are still. The infrared detector 1 can effectively detect whether the detection area has a stationary person, the false detection or the miss detection rate is low, and the structure is simple, and the normal use of the infrared sensor 11 and the lens 12 is not affected.

[0029] Specifically, the infrared sensor 11 may be a pyroelectric infrared sensor, which acquires infrared radiation and generates an infrared detection signal; the lens 12 may be a spherical lens, and the infrared sensor 11 and the lens 12 may be fixedly disposed on the substrate 10, The lens 12 covers the entire infrared sensor 11. [0030] The infrared detector 1 further includes a drive mechanism 14, which may be a stepper motor. The driving mechanism 14 can drive the blocking piece 13 to translate or rotate relative to the infrared sensor 11 on the sensing side of the infrared sensor 11, for example, the blocking piece 13 shown in FIGS. 1 and 2 rotates in the direction of the arrow about the rotating shaft 15 to sweep the lens 12 and The infrared sensor 11 is perpendicular to the plane of the infrared sensor 11 (for example, the substrate 10) and spaced apart from the lens 12. The driving mechanism 14 can also drive the flap 13 to repeatedly move for a plurality of times, for example, repeatedly shifting, the flap 13 is translated and swept, and then translated back along the original path, and so on; or it can be repeatedly rotated, and the flap 13 is rotated by the needle. After the angle (for example, 180°), rotate the angle counterclockwise, and so on. This repeated sweeping is beneficial to improve the detection accuracy.

[0031] The blocking piece 13 may be a single structure or a combination of various structures; the projection shape of the blocking piece 13 on the plane of the infrared sensor 11 (for example, the substrate 10) is elongated, and the elongated shape is in the passing process. The entire lens 12 is spanned. For example, referring to Figures 1 and 2, the flap 13 includes an elongated blade which is a flat structure. To ensure that the shutter 13 blocks a portion of the lens 12 of the infrared sensor 11 during the sweeping process, it is also possible to obtain infrared radiation that is advantageous for analysis. Over the lens 12, the length of the shutter 13 spans the entire lens 12. Each lens has different pixels above it for reflecting the area of the space to the infrared sensor. The lens pixel divides the detection area of the infrared sensor into different sensing areas, and the blocking piece 13 is on the plane of the infrared sensor 11 (for example, the substrate 10). The projection width is at least larger than one lens pixel, and the width of the shutter 13 can be set according to the size of the detection area and the detection precision. For example, to obtain higher detection accuracy, the shutter 13 can be disposed on the plane of the infrared sensor 11 (for example) The projection width of the substrate 10) is at least greater than one lens pixel and less than two lens pixels.

Referring to FIG. 3 and FIG. 4, there is shown a schematic structural view of an infrared detector 2 according to a second embodiment of the present invention, which is different from the infrared detector 1 of the first embodiment in that The sheet 23 includes curved vanes that include an arcuate segment 2 31 in a section perpendicular to the plane of the infrared sensor 21 (e.g., the substrate 20). The curved vane is rotatable about the rotating shaft 25 by the driving mechanism 24, and the rotating shaft 25 is connected to one end of the curved section 231 and perpendicular to the substrate 20. Similarly, the curved section 231 traverses the lens 22 across the lens 22, and the outer surface curvature of the lens 22 substantially conforms to the inner surface curvature of the curved section 231 such that the inner curved surface of the curved section 231 is adjacent to the outer surface of the lens 22. By sweeping, the curved segments are better placed close to the lens, so that the pixels on each side of the lens are segmented to achieve a wider range of stationary human body detection.

5 and FIG. 6, which shows a structural diagram of an infrared detector 3 according to a third embodiment of the present invention. The infrared detector 2 is different from the infrared detector 2 in the second embodiment in that the infrared detector includes a first infrared sensor 311 and a second infrared sensor 312 disposed on the same plane (ie, the same substrate 30); 33 includes a curved vane including two arcuate segments 331 and 332 in a section perpendicular to the plane, the two arcuate segments 331 and 332 rotating about the same rotating shaft 35 by the driving mechanism 34, respectively The first infrared sensor 311 and the second infrared sensor 312 are successively swept. The use of two infrared detectors can trigger the same as a valid signal, thereby greatly reducing the false alarm rate of the infrared sensor, increasing the detection area and reducing false negatives.

[0034] Specifically, the infrared detector 3 further includes a first lens 321 and a second lens 322 on the substrate, and the two lenses cover the first infrared sensor 311 and the second infrared sensor 312, respectively. The projected shape of the two curved segments 331 and 33 2 fitted on the substrate 30 is still elongated. The shaft is located between the first lens 321 and the second lens 322 and is connected to the flap 33 between two adjacent ends of the two curved segments 331 and 332. Similarly, the curved segments 331 and 332 traverse a lens respectively across the cymbal, and the outer surface curvature of the lens substantially conforms to the inner surface curvature of the curved segment such that the curved surface of the curved segment is adjacent to the outer surface of the lens Passing over.

[0035] Referring to FIG. 7, FIG. 7 illustrates an infrared detecting method according to a fourth embodiment of the present invention. The method includes: Step S100: An infrared sensor receives infrared rays and generates an infrared detecting signal; Step S200: Determine an infrared detecting signal Whether it changes with the time, if yes, it is determined that there is activity in the infrared detection area, otherwise the next step S300 is performed; Step S300, driving the infrared sensor and the blocking piece to move relative to each other, generating a part of the lens pixel that sweeps over and blocks the infrared sensor The infrared detection signal in the process of the point, and based on the infrared detection signal, determines whether the infrared detection area is human.

[0036] In step S300, it is determined whether the infrared detection signal generated during the process of sweeping and blocking a part of the lens pixel of the infrared sensor changes with the turn, and if so, determining that there is a person in the infrared detection area, Otherwise, no one is determined in the infrared detection area.

[0037] It should be understood that the infrared detecting method herein corresponds to any of the above-mentioned infrared detectors, and any of the above-mentioned infrared detectors can implement the infrared detecting method herein, so that the above-mentioned infrared detecting can be partially or fully cited. The description of the device will not repeat the details of the infrared detection method.

The above embodiments are merely illustrative of the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention; A person skilled in the art can apply the above technology without departing from the inventive concept. The features are freely combined, and a number of variations and modifications are possible, which are within the scope of the present invention; therefore, equivalent transformations and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention. .

Claims

Claim

An infrared detector includes an infrared sensor and a lens disposed on a sensing side of the infrared sensor, wherein the infrared detector further includes a blocking piece disposed outside the sensing side of the lens, In the relative movement of the shutter and the infrared sensor, the shutter passes over and blocks a portion of the lens pixel of the infrared sensor.

The infrared detector according to claim 1, wherein said infrared detector further comprises a driving mechanism that drives said shutter to translate or rotate relative to said infrared sensor on a sensing side of said infrared sensor.

The infrared detector according to claim 2, wherein said drive mechanism comprises a stepping motor.

The infrared detector according to claim 1, wherein said flap comprises elongated strips.

The infrared detector according to claim 1, wherein said blocking piece comprises a curved blade, said curved blade comprising an arc in a section perpendicular to a plane of said infrared sensor

[Claim 6] The infrared detector according to claim 5, wherein the curved segment spans the lens across the lens, and the curved surface of the curved segment is adjacent to the lens The outer surface passes.

[Claim 7] The infrared detector according to claim 1, wherein a projection width of the shutter in a plane of the infrared sensor is at least larger than one lens pixel.

[Claim 8] The infrared detector according to claim 1, wherein the infrared detector comprises a first infrared sensor and a second infrared sensor disposed on a same plane; the shutter includes a curved blade, The curved vane includes two arcuate segments in a cross section perpendicular to the plane, the arcuate segments respectively rotating about the same axis of rotation to successively sweep across the first infrared sensor and the second infrared sensor.

[Claim 9] An infrared detecting method, comprising:

S100, the infrared sensor receives infrared rays and generates an infrared detection signal;

S200. Determine whether the infrared detection signal changes with time between days, and if yes, determine red. There is activity in the outer detection area, otherwise the next step is performed;

S300, driving the infrared sensor to move relative to the blocking piece, generating an infrared detecting signal in the process that the blocking piece passes over and blocks a part of the lens pixel of the infrared sensor, and determines whether the infrared detecting area is based on the infrared detecting signal Someone.

The infrared detecting method according to claim 9, wherein in step S300, it is determined whether the infrared detecting signal generated during the process of sweeping and blocking a part of the lens pixel of the infrared sensor is in accordance with the daytime A change occurs, and if so, it is determined that there is a stationary person in the infrared detection area, otherwise it is determined that there is no one in the infrared detection area.