Human motion detection system

Patent metadata

Field	Value
Publication number	US-9952349-B1
Application number	US-201715453402-A
Country	US
Kind code	B1
Filing date	Mar 8, 2017
Priority date	Mar 8, 2017
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

A motion detection system including a lens arranged to focus infrared radiation; a variably positionable optical attenuator arranged for variable positioning thereof opposite the focusing lens, operable for variably attenuating infrared radiation focused by the focusing lens, an extent and a magnitude of the variable attenuation being dependent on a position and on a set of physical characteristics of the variably positionable optical attenuator; a PIR sensor positioned opposite the focusing lens and the variably positionable optical attenuator, operable for sensing the focused and attenuated infrared radiation; and a human motion detection indication generator operable for ascertaining whether an intensity of infrared radiation sensed by the PIR sensor is above a human-generated infrared radiation detection threshold and, responsive thereto, for generating an indication of detection of human motion.

First claim

The invention claimed is:

1. A motion detection system comprising:
a focusing lens arranged to focus infrared radiation,
a variably positionable optical attenuator arranged for variable positioning thereof opposite said focusing lens and operable for variably attenuating at least a portion of said infrared radiation focused by said focusing lens, at least one of an extent of said variably attenuated portion of said focused infrared radiation and a magnitude of said variable attenuation being dependent on at least one of a position of said variably positionable optical attenuator opposite said focusing lens and a set of physical characteristics of said variably positionable optical attenuator;
a PIR sensor positioned opposite said focusing lens and opposite said variably positionable optical attenuator, said PIR sensor being operable for sensing at least part of said focused infrared radiation focused by said focusing lens and at least part of said attenuated infrared radiation attenuated by said variably positionable optical attenuator; and
a human motion detection indication generator communicating with said PIR sensor and operable:
for ascertaining whether an intensity of infrared radiation sensed by said PIR sensor is above a human-generated infrared radiation detection threshold; and
responsive to ascertaining that said intensity of infrared radiation sensed by said PIR sensor is above said human-generated infrared radiation detection threshold, for generating an indication of detection of human motion.

2. A motion detection system according to claim 1 and wherein said focusing lens is arranged to focus infrared radiation originating from a human motion detection field comprising at least an area generally inaccessible to house pets, and infrared radiation originating from a house pet motion detection field comprising at least an area accessible to house pets.

3. A motion detection system according to claim 2 and wherein both said human motion detection field and said house pet motion detection field also comprises corresponding areas accessible to humans.

4. A motion detection system according to claim 2 and wherein said focusing lens is a segmented Fresnel lens comprising at least a first segment having a first degree of focus and arranged to focus said infrared radiation originating from said human motion detection field, and at least a second segment having a second degree of focus and arranged to focus infrared radiation originating from a house pet motion detection field.

5. A motion detection system according to claim 4 and wherein said segmented Fresnel lens is at least one of a spherical segmented Fresnel lens and a cylindrical segmented Fresnel lens.

6. A motion detection system according to claim 4 and wherein said second degree of focus is less than said first degree of focus.

7. A motion detection system according to claim 2 and wherein at least one particular position of said variably positionable optical attenuator opposite said focusing lens is suitable for attenuating, by said variably positionable optical attenuator, said infrared radiation originating from said house pet motion detection field to at least one of an extent and a magnitude resulting in an intensity of said attenuated infrared radiation originating from said house pet motion detection field which is below said human-generated infrared radiation detection threshold.

8. A motion detection system according to claim 7 and wherein said at least one particular position of said variably positionable optical attenuator, arranged to attenuate said infrared radiation originating from said house pet motion detection field to said at least one of said extent and said magnitude resulting in said intensity of said attenuated infrared radiation originating from said house pet motion detection field which is below said human-generated infrared radiation detection threshold, is ambient temperature-dependent.

9. A motion detection system according to claim 2 and wherein at least one particular set of physical characteristics of said variably positionable optical attenuator is suitable for attenuating, by said variably positionable optical attenuator, said infrared radiation originating from said house pet motion detection field to at least one of an extent and a magnitude resulting in an intensity of said attenuated infrared radiation originating from said house pet motion detection field which is below said human-generated infrared radiation detection threshold.

10. A motion detection system according to claim 2 and wherein at least one combination of at least one position of said variably positionable optical attenuator opposite said focusing lens and at least one particular set of physical characteristics of said variably positionable optical attenuator is suitable for attenuating, by said variably positionable optical attenuator, said infrared radiation originating from said house pet motion detection field to at least one of an extent and a magnitude resulting in an intensity of said attenuated infrared radiation originating from said house pet motion detection field which is below said human-generated infrared radiation detection threshold.

11. A motion detection system according to claim 10 and wherein said at least one particular position of said variably positionable optical attenuator, arranged in combination with said at least one particular set of physical characteristics of said variably positionable optical attenuator to attenuate said infrared radiation originating from said house pet motion detection field to said at least one of said extent and said magnitude resulting in said intensity of said attenuated infrared radiation originating from said house pet motion detection field which is below said human-generated infrared radiation detection threshold, is ambient temperature-dependent.

12. A motion detection system according to claim 1 and wherein said human-generated infrared radiation detection threshold is ambient temperature-dependent.

13. A motion detection system according to claim 1 and wherein said set of physical characteristics of said variably positionable optical attenuator comprises at least one of:
a variable thickness of said variably positionable optical attenuator;
apertures formed in said variably positionable optical attenuator, said apertures being arranged to allow at least part of said focused infrared radiation to freely pass therethrough; and
a scattering surface of said variably positionable optical attenuator, which scattering surface is formed to at least partially scatter at least part of said focused infrared radiation.

14. A motion detection system according to claim 1 and wherein said variably positionable optical attenuator is variably positionable between said focusing lens and said PIR sensor.

15. A motion detection system according to claim 1 and wherein said variably positionable optical attenuator is arranged for manual variable positioning thereof opposite said focusing lens.

16. A motion detection system according to claim 1 and wherein said variably positionable optical attenuator is arranged for automatic variable positioning thereof opposite said focusing lens.

17. A motion detection system according to claim 16 and also comprising a motorized position controller operable for automatically variably positioning said variably positionable optical attenuator opposite said focusing lens.

18. A motion detection system according to claim 16 and wherein said automatic variable positioning of said variably positionable optical a

Assignees

• Tyco Fire & Security Gmbh

Inventors

• Zhevelev Boris
• Schviki Yehuda

Classifications

• G01J1/0414

  using plane or convex mirrors, parallel phase plates, or plane beam-splitters · CPC title

• G01V8/10 Primary

  Detecting, e.g. by using light barriers (by reflection from the object G01S17/00) · CPC title

• G01J5/0816

  using attenuators · CPC title

• G08B13/193

  using focusing means · CPC title

• G01J5/0025

  Living bodies (ear thermometers G01J5/0011; detecting, measuring or recording for diagnostic purposes A61B5/00) · CPC title