Multiple microbolometer selection for simultaneous readout

Patent metadata

Field	Value
Publication number	US-11212466-B2
Application number	US-202016909768-A
Country	US
Kind code	B2
Filing date	Jun 23, 2020
Priority date	Dec 29, 2017
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

Techniques are disclosed for facilitating multiple microbolometer selection for simultaneous readout. In one example, a device includes a plurality of microbolometers. The plurality of microbolometers includes a first set and a second set of serially-connected microbolometers. The device further includes a first plurality of switches configured to selectively short the plurality of microbolometers. The device further includes a second plurality of switches configured to selectively couple the plurality of microbolometers to ground. The device further includes a third plurality of switches configured to selectively provide a bias signal to the plurality of microbolometers. The device further includes a processing circuit configured to configure the first plurality, second plurality, and third plurality of switches to cause simultaneous read out of one microbolometer of the first set and one microbolometer of the second set. Related methods and systems are also provided.

First claim

What is claimed is:

1. A device, comprising:
a plurality of microbolometers comprising a first set of serially-connected microbolometers and a second set of serially-connected microbolometers;
a first plurality of switches, wherein each switch of the first plurality is configured to selectively short a respective one of the plurality of microbolometers;
a second plurality of switches, wherein each switch of the second plurality is configured to selectively couple a respective one of the plurality of microbolometers to ground;
a third plurality of switches, wherein each switch of the third plurality is configured to selectively provide a bias signal to a respective one of the plurality of microbolometers; and
a processing circuit configured to configure the first plurality, second plurality, and third plurality of switches to cause simultaneous read out of one microbolometer of the first set and one microbolometer of the second set.

2. The device of claim 1 , wherein a first microbolometer of the first set shares a contact with a first microbolometer of the second set.

3. The device of claim 2 , wherein:
a center of the plurality of microbolometers includes the first microbolometer of the first set and the first microbolometer of the second set;
the processing circuit is configured to:
for a first read out, cause simultaneous read out of a second microbolometer of the first set and a second microbolometer of the second set; and
for a second read out subsequent to the first read out, cause simultaneous read out of a third microbolometer of the first set and a third microbolometer of the second set, wherein the third microbolometer of the first set is closer to the center than the second microbolometer of the first set, and wherein the third microbolometer of the second set is closer to the center than the second microbolometer of the second set.

4. The device of claim 3 , wherein a number of microbolometers between the first and third microbolometers of the first set is the same as a number of microbolometers between the first and third microbolometers of the second set.

5. The device of claim 1 , wherein:
the second plurality of switches comprises a first set of switches and a second set of switches,
each switch of the first set of switches is configured to selectively couple a respective one of the first set of microbolometers to a first ground, and
each switch of the second set of switches is configured to selectively couple a respective one of the second set of microbolometers to a second ground.

6. The device of claim 1 , wherein:
the third plurality of switches comprises a first set of switches and a second set of switches,
each switch of the first set of switches is configured to selectively provide a first bias voltage via a first bias line to a respective one of the first set of microbolometers, and
each switch of the second set of switches is configured to selectively provide a second bias voltage via a second bias line to a respective one of the second set of microbolometers.

7. The device of claim 1 , wherein each microbolometer of the plurality of microbolometers shares a contact with one or more adjacent microbolometers.

8. The device of claim 1 , wherein:
the first plurality of switches comprises a first set of switches and a second set of switches,
each switch of the first set of switches is configured to selectively short a respective one of the first set of microbolometers, and
each switch of the second set of switches is configured to selectively short a respective one of the second set of microbolometers.

9. The device of claim 8 , wherein, during simultaneous read out of a first microbolometer of the first set of microbolometers and a first microbolometer of the second set of microbolometers, the processing circuit is configured to:
configure a first switch of the first set of switches that is parallel to the first microbolometer of the first set of microbolometers to an open state; and
configure a first switch of the second set of switches that is parallel to the first microbolometer of the second set of microbolometers to the open state.

10. The device of claim 9 , wherein, during simultaneous read out of the first microbolometer of the first set of microbolometers and the first microbolometer of the second set of microbolometers, the processing circuit is further configured to:
configure a second switch of the first set of switches that is parallel to a second microbolometer of the first set of microbolometers to the open state, wherein the first and second microbolometers of the first set of microbolometers are adjacent to each other; and
configure a second switch of the second set of switches that is parallel to a second microbolometer of the second set of microbolometers to the open state, wherein the first and second microbolometers of the second set of microbolometers are adjacent to each other.

11. The device of claim 10 , wherein, during simultaneous read out of the first microbolometer of the first set of microbolometers and the first microbolometer of the second set of microbolometers, the processing circuit is further configured to:
configure a third switch of the first set of switches that is parallel to a third microbolometer of the first set of microbolometers to the open state, wherein the first microbolometer of the first set of microbolometers is adjacent to the second and third microbolometers of the first set of microbolometers; and
configure a fourth switch of the second set of switches that is parallel to a third microbolometer of the second set of microbolometers to the open state, wherein the first microbolometer of the second set of microbolometers is adjacent to the second and third microbolometers of the second set of microbolometers.

12. The device of claim 8 , wherein, during simultaneous read out of the first microbolometer of the first set of microbolometers and the first microbolometer of the second set of microbolometers, a current is steered to a first ground via a first bias line and the first microbolometer of the first set of microbolometers and a current is steered to a second ground via a second bias line and the first microbolometer of the second set of microbolometers.

13. The device of claim 12 , wherein, during simultaneous read out of the first microbolometer of the first set of microbolometers and the first microbolometer of the second set of microbolometers:
a current is steered to the first ground via the first bias line and a second microbolometer and the first microbolometer of the first set of microbolometers, and
a current is steered to the second ground via the second bias line and a second microbolometer and the first microbolometer of the second set of microbolometers,
wherein the first and second microbolometers of the first set of microbolometers are adjacent to each other, and wherein the first and second microbolometers of the second set of microbolometers are adjacent to each other.

14. A method, comprising:
providing a plurality of microbolometers comprising a first set of serially-connected microbolometers and a second set of serially-connected microbolometers;
selecting a first microbolometer of the first set and a first microbolometer of the second set;
based on the selected first microbolometer of the first set and the selected first microbolometer of the second set:
configuring a first plurality of switches to selectively short one or more of the plurality of microbolometers;
configuring a second plurality of switches to selectively couple one or more of the plurality of microbolometers to ground; and
configurin

Assignees

• Flir Systems

Inventors

• Simolon Brian B
• Aziz Naseem Y

Classifications

• G01J3/36 Primary

  Investigating two or more bands of a spectrum by separate detectors · CPC title

• H04N25/21

  for transforming thermal infrared radiation into image signals · CPC title

• H04N23/23

  from thermal infrared radiation · CPC title

• H04N25/76

  Addressed sensors, e.g. MOS or CMOS sensors · CPC title

• G01J2005/202

  Arrays · CPC title