CN202903336U - Human body detector based on liquid crystal light valve - Google Patents
Human body detector based on liquid crystal light valve Download PDFInfo
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- CN202903336U CN202903336U CN 201220617360 CN201220617360U CN202903336U CN 202903336 U CN202903336 U CN 202903336U CN 201220617360 CN201220617360 CN 201220617360 CN 201220617360 U CN201220617360 U CN 201220617360U CN 202903336 U CN202903336 U CN 202903336U
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- light valve
- liquid crystal
- crystal light
- pyroelectric sensor
- human body
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Abstract
The utility model discloses a human body detector based on a liquid crystal light valve. The human body detector comprises a pyroelectric sensor, a Fresnel lens, a fixed mount, a signal amplifier, a liquid crystal light valve, and a light valve controller. The Fresnel lens is installed on the fixed mount, and the Fresnel lens and the fixed mount form a detector cavity. In the detector cavity, the pyroelectric sensor and the liquid crystal light valve are disposed. The pyroelectric sensor, the liquid crystal light valve, the light valve controller, and the signal amplifier are installed on the fixed mount. The liquid crystal light valve is disposed in front of the pyroelectric sensor. The light valve controller is used to control to drive the liquid crystal light valve to transparent and non-transparent states at a certain interval. The human body detector sets the transparent and non-transparent states of the liquid crystal light valve at a certain interval, and static state is simulated into effects of human movement, so that the human body detector can detect static state human bodies. The human body detector is silent when operating, and brings about better home experience.
Description
Technical field
The utility model relates to a kind of peoplesniffer, particularly is applied to the peoplesniffer of Smart Home and safety-security area.
Background technology
Pyroelectric sensor claims again infrared sensor of the human body, is widely used in burglar alarm, the guest informs and the infrared field such as non-contact switch.Along with the fast development of intelligent home device, the peoplesniffer that pyroelectric sensor is made has become again the requisite assembly of intelligent home device.The principle of work of pyroelectric sensor is: piezoelectric ceramics class dielectric can keep polarized state after electric polarization, be called spontaneous polarization.Spontaneous polarization raises with temperature and reduces, and reduces to zero at Curie-point temperature.Therefore, when this material is subject to infrared radiation and temperature when raising, surface charge will reduce, and be equivalent to discharge a part of electric charge, so be called pyroelectricity.The electric charge that discharges be can be exchanged into Voltage-output through amplifier.But there is a shortcoming in this device: when radiation continues to act on the pyroelectricity element, when making its surface charge reach balance, just no longer discharge electric charge.Therefore, pyroelectric sensor can not be surveyed constant infrared radiation.Just because of this shortcoming, the human body that the existing peoplesniffer of being made by pyroelectric sensor can only detected event can't be surveyed the human body of stationary state, and insensitive to the detection of the radial motion of human body.Yet in the occasion of part high request, such as, meeting room, office or the higher occasion of other anti-theft grades need a kind of detector that can survey the stationary state human body.
Summary of the invention
Problem to be solved in the utility model provides a kind of detector that can survey the stationary state human body.
For addressing the above problem, the scheme that the utility model adopts is:
A kind of peoplesniffer based on liquid crystal light valve comprises: pyroelectric sensor, Fresnel Lenses, fixed mount, signal amplifier, liquid crystal light valve, light valve controller.Wherein, Fresnel Lenses is installed on the fixed mount, and Fresnel Lenses and fixed mount surround the detector cavity, includes pyroelectric sensor, liquid crystal light valve in the detector cavity, and pyroelectric sensor, liquid crystal light valve are installed on the fixed mount.Liquid crystal light valve is positioned at the pyroelectric sensor front.Light valve controller and signal amplifier are installed on the fixed mount.Light valve controller and signal amplifier can be positioned at the detector cavity, also can be outside the detector cavity.Signal amplifier is used for amplifying the output voltage of pyroelectric sensor.The light valve controller is used for control and drives the transparent and opaque state of liquid crystal light valve by certain time interval.
The principle that the utility model is surveyed the stationary state human body is as follows: liquid crystal light valve is to make according to the electrooptical effect of liquid crystal, and under the state of not energising, liquid crystal light valve is transparent, light can pass liquid crystal, when liquid crystal was switched on, liquid crystal light valve became opaque, and light can't pass.The infrared ray that human body sends is sent on the pyroelectric sensor of peoplesniffer by Fresnel Lenses, because the liquid crystal light valve in the pyroelectric sensor front changes in transparent and opaque state by the certain hour interval, the infrared ray that the human body of stationary state sends, can only must arrive pyroelectric sensor in the compartment of terrain, thereby so that the signal that pyroelectric sensor receives and non-constant infrared ray simulate movement effects thereby the stationary state human body is sent the infrared ray that arrives pyroelectric sensor.
Technique effect of the present utility model:
1, peoplesniffer of the present utility model is by the regularly variation in transparent and opaque state of liquid crystal light valve, stationary state is simulated the effect of human motion, so that peoplesniffer of the present utility model not only can be surveyed the human body of motion state, can also survey the human body of stationary state.
2, the utility model has more comfortable household than mechanical system and experiences because the employing non-mechanical means is noiseless during the switch liquid crystal light valve.
Description of drawings
Fig. 1 is structural representation of the present utility model.Wherein Fresnel Lenses is hemispheric thin slice.
Fig. 2 is structural representation of the present utility model.Wherein Fresnel Lenses is plane lamina.
Fig. 3 is the perspective view of the utility model liquid crystal light valve when being in pellucidity.
Fig. 4 is the perspective view of the utility model liquid crystal light valve when being in opaque state.
Embodiment
Provide specific embodiment below in conjunction with accompanying drawing, further the utility model is elaborated.
The utility model such as Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, comprises pyroelectric sensor 1, Fresnel Lenses 2, liquid crystal light valve 3, fixed mount 4, signal amplifier 5, light valve controller 6 based on the basic structure of the peoplesniffer of liquid crystal light valve.Wherein, Fresnel Lenses 2 is installed on the fixed mount 4, and Fresnel Lenses 2 surrounds the detector cavity with fixed mount 4.Pyroelectric sensor 1 and liquid crystal light valve 3 are positioned at the detector cavity.The Fresnel Lenses 2 that Fig. 1 provides is hemispheric thin slice, and its detector cavity also is semisphere.The Fresnel Lenses 2 that Fig. 2 provides is plane lamina, 4 layers of tubular or square of fixed mount.The face shaping of peoplesniffer can also be other shapes, and the face shaping that it will be appreciated by those skilled in the art that peoplesniffer does not consist of the restriction to the utility model claim.Pyroelectric sensor 1 is mounted and fixed on the fixed mount 4.Liquid crystal light valve 3 is fixed on the fixed mount 4 by bracing frame 31, so that liquid crystal light valve 3 can block pyroelectric sensor 1 before being positioned at pyroelectric sensor 1.Signal amplifier 5, light valve controller 6 are installed on the fixed mount 4, can be positioned at the detector cavity, also can be positioned at outside the detector cavity.The signal amplifier 5, the light valve controller 6 that provide among Fig. 1 all are positioned at outside the detector cavity, and the signal amplifier 5 that provides among Fig. 2, Fig. 3 and Fig. 4, light valve controller 6 all are positioned at the detector cavity.Fixed mount 4 is except being used for the fixing human detector parts and making up the detector control chamber, also can comprise and be used to peoplesniffer is fixedly mounted on the device that uses point, such as, peoplesniffer is fixing on the wall, or be installed in the device of air conditioner inside, those skilled in the art know that these do not consist of the restriction to the utility model claim.Signal amplifier 5 is used for amplifying the output voltage of pyroelectric sensor 1, is connected with pyroelectric sensor 1 by data line.Light valve controller 6 is used for the transparent and opaque state by certain time interval control liquid crystal light valve 3, light valve controller 6 is connected with liquid crystal light valve 3 by power lead, and light valve controller 6 is by the transparent and opaque state of the power lead control liquid crystal light valve 3 of control liquid crystal light valve 3.When needs arranged liquid crystal light valve 3 for pellucidity, light valve controller 6 was by the voltage of power lead to liquid crystal light valve 3 output low levels; When needs arranged liquid crystal light valve 3 for opaque state, light valve controller 6 was by the voltage of power lead to liquid crystal light valve 3 output high level.When the input voltage of liquid crystal light valve 3 is low level, show as pellucidity, when the voltage of liquid crystal light valve 3 inputs is high level, show as opaque state.Structural representation when liquid crystal light valve 3 shows as pellucidity can be seen inner structure by transparent liquid crystal light valve as shown in Figure 3; Structural representation when liquid crystal light valve 3 shows as opaque state as shown in Figure 4, opaque liquid crystal light valve has blocked inner structure.In like manner, when liquid crystal light valve 3 was pellucidity, the infrared ray that human body sends can arrive pyroelectric sensor 1 by liquid crystal light valve 3; When liquid crystal light valve 3 was opaque state, the infrared ray that human body sends can't arrive pyroelectric sensor 1.When light valve controller 6 was controlled constantly liquid crystal light valve and changed in transparent and opaque state by the certain hour interval, the infrared ray that the human body of stationary state sends can only must arrive pyroelectric sensor in the compartment of terrain.Aforementioned interlude can be 0.3s-3s.
Claims (1)
1. the peoplesniffer based on liquid crystal light valve is characterized in that, comprising: pyroelectric sensor, Fresnel Lenses, fixed mount, signal amplifier, liquid crystal light valve, light valve controller; Wherein, Fresnel Lenses is installed on the fixed mount, and Fresnel Lenses and fixed mount surround the detector cavity; Include pyroelectric sensor, liquid crystal light valve in the detector cavity; Pyroelectric sensor, liquid crystal light valve, light valve controller and signal amplifier are installed on the fixed mount; Liquid crystal light valve is positioned at before the pyroelectric sensor; Signal amplifier is used for amplifying the output voltage of pyroelectric sensor; The light valve controller is used for control and drives the transparent and opaque state of liquid crystal light valve by certain time interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220617360 CN202903336U (en) | 2012-11-21 | 2012-11-21 | Human body detector based on liquid crystal light valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220617360 CN202903336U (en) | 2012-11-21 | 2012-11-21 | Human body detector based on liquid crystal light valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202903336U true CN202903336U (en) | 2013-04-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220617360 Expired - Lifetime CN202903336U (en) | 2012-11-21 | 2012-11-21 | Human body detector based on liquid crystal light valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN202903336U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928092A (en) * | 2012-11-21 | 2013-02-13 | 南京天溯自动化控制系统有限公司 | Human body detector based on liquid crystal light valve |
| CN104713652A (en) * | 2015-04-04 | 2015-06-17 | 肖国选 | Pyroelectric infrared sensor |
| CN105654862A (en) * | 2016-03-09 | 2016-06-08 | 江门吉华光电精密有限公司 | Energy-saving nixie tube and control method |
| CN106568513A (en) * | 2016-11-26 | 2017-04-19 | 李星 | Sensing device capable of detecting static human body |
| CN108318138A (en) * | 2017-12-29 | 2018-07-24 | 上海瀚决网络科技有限公司 | Thermal infrared detector |
-
2012
- 2012-11-21 CN CN 201220617360 patent/CN202903336U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928092A (en) * | 2012-11-21 | 2013-02-13 | 南京天溯自动化控制系统有限公司 | Human body detector based on liquid crystal light valve |
| CN104713652A (en) * | 2015-04-04 | 2015-06-17 | 肖国选 | Pyroelectric infrared sensor |
| CN104713652B (en) * | 2015-04-04 | 2018-05-25 | 肖国选 | Pyroelectric infrared sensor |
| CN105654862A (en) * | 2016-03-09 | 2016-06-08 | 江门吉华光电精密有限公司 | Energy-saving nixie tube and control method |
| CN106568513A (en) * | 2016-11-26 | 2017-04-19 | 李星 | Sensing device capable of detecting static human body |
| CN108318138A (en) * | 2017-12-29 | 2018-07-24 | 上海瀚决网络科技有限公司 | Thermal infrared detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130424 |