Auto detection system based on thermal signals

Patent metadata

Field	Value
Publication number	US-11754293-B2
Application number	US-202217584755-A
Country	US
Kind code	B2
Filing date	Jan 26, 2022
Priority date	Aug 3, 2018
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

There is provided an auto detection system including a thermal detection device and a host. The host controls an indication device to indicate a prompt message or detection results according to a slope variation of voltage values or 2D distribution of temperature values detected by the thermal detection device, wherein the voltage values include the detected voltage of a single pixel or the sum of detected voltages of multiple pixels of a thermal sensor.

First claim

What is claimed is:

1. An auto detection system, configured to monitor an elevator cabin, the auto detection system comprising:
a thermal detection device configured to output digital values at a predetermined frequency; and
a host configured to
receive the digital values,
calculate a slope between two digital values,
identify opening and closing of a door of the elevator cabin by comparing the calculated slop and a slope threshold range, and
calculate a fluctuation degree of multiple digital values within a predetermined time interval after the door is identified to be opened and then closed.

2. The auto detection system as claimed in claim 1 , wherein
the thermal detection device is further configured to output object temperatures at the predetermined frequency, and
the host is further configured to calculate a temperature variation of the object temperatures, and identify the elevator cabin having a person therein in response to
the calculated slope between the two digital values exceeding the slope threshold range,
the fluctuation degree exceeding a code variation threshold, and
the temperature variation exceeding a temperature threshold.

3. The auto detection system as claimed in claim 1 , wherein the thermal detection device comprises:
a single thermopile sensor configured to generate a voltage signal at the predetermined frequency; and
an analog to digital converter configured to convert the voltage signal to the digital signals.

4. The auto detection system as claimed in claim 1 , wherein the thermal detection device comprises:
a thermopile sensor array comprising a pixel array configured to generate multiple voltage signals;
an addition circuit configured to perform binning on the multiple voltage signals to generate a voltage sum; and
an analog to digital converter configured to convert the voltage sum to the digital signals.

5. The auto detection system as claimed in claim 2 , wherein the host is
coupled with an indication device for indicating whether the elevator cabin has a person therein or not via the indication device, or
coupled with a mobile device for indicating whether the elevator cabin has a person therein or not via the mobile device.

6. The auto detection system as claimed in claim 2 , wherein the thermal detection device is further configured to output ambient temperatures to the host.

7. The auto detection system as claimed in claim 6 , wherein the host is further configured to adjust at least one of the slope threshold range, the temperature threshold and the code variation threshold according to the ambient temperatures.

8. The auto detection system as claimed in claim 2 , wherein
the two digital values are two adjacent digital values outputted by the thermal detection device,
the fluctuation degree is a standard deviation of the multiple digital values, and
the temperature variation is a difference between two adjacent object temperatures outputted by the thermal detection device, or a difference between a current object temperature outputted by the thermal detection device and a reference temperature.

9. The auto detection system as claimed in claim 1 , wherein the thermal detection device has a field of view which does not cover an entrance of the elevator cabin.

10. The auto detection system as claimed in claim 1 , wherein the predetermined time interval is 3 to 10 seconds.

11. An auto detection system, configured for stove detection, the auto detection system comprising:
a thermal detection device, having a field of view covering the stove, the thermal detection device comprising a thermopile sensor array configured to output a thermal frame having multiple object temperatures; and
a host, configured to receive the multiple object temperatures, and control a display device to show a message of reaching a target temperature upon identifying that at least one of the multiple object temperatures is larger than a heating threshold.

12. The auto detection system as claimed in claim 11 , wherein the host is further configured to
turn on an extraction fan upon identifying that the multiple object temperatures exceed a room temperature threshold, and
automatically adjust a wind strength of the extraction fan according to a variation of the multiple object temperatures exceeding the room temperature threshold.

13. The auto detection system as claimed in claim 11 , wherein the host is further configured to control the display device to show a warning message upon identifying that the multiple object temperatures exceed a high temperature threshold.

14. The auto detection system as claimed in claim 11 , wherein the host is configured to control the display device to show the multiple object temperatures as a 2D image.

15. The auto detection system as claimed in claim 11 , wherein the host is further configured to switch off the stove when there is no human body moving in the field of view for a predetermined time interval.

16. An auto detection system, comprising:
a thermal detection device, having a field of view covering ingredients, the thermal detection device comprising a thermopile sensor array configured to output a thermal frame having multiple object temperatures; and
a host, configured to receive the multiple object temperatures and control a display device to show a message of nonuniform temperature upon identifying that uniformity of the multiple object temperatures is lower than a uniformity threshold.

17. The auto detection system as claimed in claim 16 , wherein the host is further configured to
turn on an extraction fan upon identifying that the multiple object temperatures exceed a room temperature threshold, and
automatically adjust a wind strength of the extraction fan according to a variation of the multiple object temperatures exceeding the room temperature threshold.

18. The auto detection system as claimed in claim 16 , wherein the host is further configured to control the display device to show a warning message upon identifying that the multiple object temperatures exceed a high temperature threshold.

19. The auto detection system as claimed in claim 16 , wherein the host is further configured to control the display device to show the multiple object temperatures as a 2D image.

20. The auto detection system as claimed in claim 16 , wherein the host is further configured to switch off a stove containing the ingredients when there is no human body moving in the field of view for a predetermined time interval.

Assignees

• Pixart Imaging Inc

Inventors

• Sun Chih-Ming
• Tsai Ming-Han
• Lin Chiung-Wen
• Yu Po-Wei
• Wang Wei-Ming
• Huang Sen-Huang

Classifications

• F24C15/2021 Primary

  Arrangement or mounting of control or safety systems · CPC title

• F24C15/2042 Primary

  Devices for removing cooking fumes structurally associated with a cooking range e.g. downdraft (F24C15/2007 takes precedence) · CPC title

• A61F13/42

  with wetness indicator or alarm · CPC title

• A61F2013/421

  the alarm being a temperature change · CPC title

• B66B5/0012

  Devices monitoring the users of the elevator system · CPC title