Luminaire, and a corresponding method

Patent metadata

Field	Value
Publication number	US-11922792-B2
Application number	US-202017431606-A
Country	US
Kind code	B2
Filing date	Feb 10, 2020
Priority date	Feb 22, 2019
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

Some embodiments are directed to a motion detector (100) configured to signal-process a motion signal to obtain multiple motion components, a motion component being correlated with a direction and velocity of a motion in the environment, cancel in motion components, two motion components that correspond to motions with opposite directions, and detect motion in the environment from the motion components that are not cancelled.

First claim

The invention claimed is:

1. A luminaire comprising a motion detector, the motion detector comprising:
a motion sensor interface configured to receive a motion signal from a motion sensor, said motion signal being correlated with motion of objects in an environment of the motion sensor,
a processor system configured to:
signal-process the motion signal to obtain multiple motion components, a motion component being correlated with a direction and velocity of a motion in the environment,
cancel in the motion components, two motion components that correspond to motions with opposite values to remove the contribution of the two motion components that correspond to motions with the opposite values,
detect motion of objects in the environment from the motion components that are not cancelled,
wherein the luminaire being connectable to a light-emitting element and being configured to control the light-emitting element at least in dependency upon the motion detector.

2. The luminaire as in claim 1 , wherein the motion signal received by the motion sensor interface comprises a first channel (I) and a different second channel (Q), the first and second channel being correlated with motion in the environment of the motion sensor.

3. The luminaire as in claim 2 , wherein the signal-processing comprises obtaining a complex signal from the first and second channel (I+jQ), by a frequency transformation.

4. The luminaire as in claim 2 , wherein the sensor is a two-channel Doppler microwave sensor.

5. The luminaire as in claim 1 , wherein the signal-processing comprises transforming the motion signal from a time-domain to a frequency-domain to obtain the multiple motion components.

6. The luminaire as in claim 5 , wherein the motions with opposite directions contribute to different motion components of the multiple motion components.

7. The luminaire as in claim 1 , wherein the multiple motion components correspond to a frequency, motions with opposite directions contribute to motion components having the same frequency but an opposite sign.

8. The luminaire as in claim 1 , wherein a motion component corresponding to a frequency is subtracted from a motion component with the same frequency but opposite sign to cancel the motion components that correspond to motions with opposite directions.

9. The luminaire as in claim 1 , wherein cancelling two motion components comprises multiplying one of the two motion components with a correction factor (β) before subtracting the two motion components.

10. The luminaire as in claim 1 , wherein cancelling the two motion components comprises computing
∥| A (ω)|−β| A (−ω)∥−∥ A (−ω)|−β| A (ω)|∥,

wherein |A(ω)| represents the magnitude of a motion components for frequency ω, and β represents a correction factor.

11. The luminaire as in claim 9 , wherein the processor system is configured to estimate the correction factor during use of the motion sensor.

12. The luminaire as in claim 11 , wherein the processor system is configured to:
determine if a motion signal corresponds to a non-vibrating motion,
estimate the correction factor from the motion signal.

13. The luminaire as in claim 1 , the luminaire further comprising at least one light-emitting element.

14. A motion detection method comprising:
receiving a motion signal from a luminaire comprising a motion sensor, said motion signal being correlated with motion of objects in an environment of the motion sensor, wherein said luminaire being connectable to a light emitting element,
signal-processing the motion signal to obtain multiple motion components, a motion component being correlated with a direction and velocity of a motion in the environment,
cancelling in the motion components, two motion components that correspond to motions with opposite values to remove the contribution of the two motion components that correspond to motions with the opposite values,
detecting motion of objects in the environment from the motion components that are not cancelled,
controlling the light emitting element at least in dependency upon the motion sensor.

15. A non-transitory computer readable medium comprising data representing instructions to cause a processor system to perform the method according to claim 14 .

Assignees

• Signify Holding Bv

Inventors

• Khan Shoaib Hussain
• Pijlman Fetze

Classifications

• G08B25/10 Primary

  using wireless transmission systems {(G08B25/009 takes precedence)} · CPC title

• G01S7/023

  Interference mitigation, e.g. reducing or avoiding non-intentional interference with other HF-transmitters, base station transmitters for mobile communication or other radar systems, e.g. using electro-magnetic interference [EMI] reduction techniques (auxiliary means for detecting or identifying radar signals or the like G01S7/021; means for anti-jamming G01S7/36) · CPC title

• G01S7/415

  Identification of targets based on measurements of movement associated with the target · CPC title

• G01S13/56

  for presence detection {(presence detection using near field arrangements G01V3/00, e.g. G01V3/08, G01V3/12; burglar, theft or intruder alarms with electrical actuation G08B13/22 - G08B13/26)} · CPC title

• G08B13/189

  using passive radiation detection systems · CPC title