Encoded signal detection and display

• US 10,323,902 B2
• Filed: 01/19/2018
• Issued: 06/18/2019
• Est. Priority Date: 05/04/2010
• Status: Active Grant

• Current Assignee: LMD Applied Science LLC
• Original Assignee: LaserMax Incorporated
• Inventors: Houde-Walter, Susan R.
• Primary Examiner(s): Taningco, Marcus H
• Application Number:
  US15/875,396
• Publication Number:
  US 20180274885A1
• Time in Patent Office: 515 Days
• CPC Class Codes: F41G 1/35 for illuminating the target , e.g. flash lights
• CPC Class Codes: F41G 3/145 using a target illuminator
• CPC Class Codes: F41G 7/226 Semi-active homing systems, i.e. comprising a receiver and involving auxiliary illuminating means, e.g. using auxiliary guiding missiles
• CPC Class Codes: F41G 7/2293 using electromagnetic waves other than radio waves
• CPC Class Codes: G01J 5/07 Arrangements for adjusting the solid angle of collected radiation, e.g. adjusting or orienting field of view, tracking position or encoding angular position optical collimating elements G01J5/0806
• CPC Class Codes: G01J 5/0896 using a light source, e.g. for illuminating a surface

Abstract

A target marking system includes a light source emitting a thermal beam having a predetermined temporal modulation, and an optics assembly directing the thermal beam to impact a target, the target directing radiation to the optics assembly in response to the impact. A portion of the radiation having the predetermined temporal modulation. The target marking system further includes a detector configured to distinguish the portion of the radiation having the predetermined temporal modulation from a remainder of the radiation, the portion of the radiation passing to the director through the optics assembly. The system also includes a readout integrated circuit, the detector directing an input signal to the readout integrated circuit, and the readout integrated circuit producing a digitally enhanced output signal in response to receipt of the input signal.

Claims

1. A target marking system, comprising:

(a) a light source configured to emit a thermal beam having a particular temporal modulation;

(b) an optics assembly configured to direct the emitted beam to impact a target, and to receive radiation from the target in response to the impact, a portion of the radiation received from the target having the particular temporal modulation;

(c) a detector configured to;

receive the portion of the radiation via the optics assembly,

detect the particular temporal modulation, and

generate a corresponding output signal; and

(d) a display operably connected to the detector, the display being configured to display an image based at least partly on the output signal, the image illustrating;

at least part of the emitted beam,

a point of impact of the emitted beam separate from the at least part of the emitted beam, and

a portion of the target impacted by the emitted beam.

2. The system of claim 1, wherein the detector comprises an uncooled microbolometer array.

3. The system of claim 1, wherein the detector comprises an array of heat-sensitive pixels.

4. The system of claim 1, further including a readout integrated circuit operably connected to the detector, the readout integrated circuit configured to:

receive the output signal from the detector,

generate a digitally enhanced signal based at least partly on the output signal, and

direct the digitally enhanced signal to the display, the display being configured to generate the image based at least partly on the digitally enhanced signal.

5. The system of claim 4, wherein the detector comprises a first array of pixels and the display comprises a second array of pixels corresponding to the first array of pixels.

6. The system of claim 5, wherein the output signal generated by the detector includes information indicative of an intensity level detected, by a pixel of the first array of pixels, over time.

7. The system of claim 4, wherein generating the image comprises modifiying one of a color, contrast, brightness, and gain of at least one pixel of the display based at least partly on the digitally enhanced signal.

8. The system of claim 4, wherein generating the image comprises temporally modulating operation of at least one pixel of the display based at least partly on the digitally enhanced signal.

9. The system of claim 1, wherein the light source comprises a quantum cascade laser.

10. The system of claim 1, wherein the emitted beam extends from the light source to the target, the radiation received from the target comprises at least one of re-emitted, reflected, and scattered radiation, and the portion of the radiation received from the target is separate from the at least part of the emitted beam illustrated in the image.

11. A method, comprising:

(a) passing an emitted thermal beam having a particular temporal modulation from a light source through an optics assembly;

(b) impinging the emitted beam upon a target, the target directing radiation to the optics assembly, a portion of the radiation having the particular temporal modulation;

(c) directing the portion of the radiation to a detector via the optics assembly;

(d) detecting the particular temporal modulation with the detector;

(e) generating an output signal indicative of the temporal modulation with the detector; and

(f) displaying an image based at least partly on the output signal, the image illustrating at least part of the emitted beam, a point of impact of the emitted beam separate from the at least part of the emitted beam, and at least a portion of the target impacted by the emitted beam, at least a portion of the displayed image comprising a digital enhancement corresponding to the particular temporal modulation.

12. The method of claim 11, further comprising controlling functionality of individual display pixels based on the particular temporal modulation.

13. The method of claim 12, wherein controlling the functionality of individual display pixels comprises color-coding at least one of the pixels to indicate the portion of the radiation having the particular temporal modulation.

14. The method of claim 11, wherein passing the emitted thermal beam comprises varying an electrical current applied to the light source at a predetermined timed interval.

15. A method, comprising:

(a) providing a light source configured to emit a thermal beam having a particular temporal modulation;

(b) providing an optics assembly optically downstream of the light source, the optics assembly being configured to direct the emitted beam to impinge upon a target, and to receive radiation from the target in response to impinging the emitted beam upon the target, a portion of the radiation received from the target having the particular temporal modulation;

(c) providing a detector optically downstream of the optics assembly, the detector being configured to;

receive the portion of the radiation via the optics assembly, wherein the portion of the radiation is separate from the emitted beam,

detect the particular temporal modulation, and

generate an output signal indicative of the temporal modulation; and

(d) operably connecting a display to the detector, the display being configured to display an image based at least partly on the output signal, the image illustrating;

at least part of the emitted beam,

a point of impact of the emitted beam separate from the at least part of the emitted beam, and

a portion of the target impinged upon by the emitted beam.

16. The method of claim 15, further comprising operably connecting a readout integrated circuit to the detector, the readout integrated circuit configured to:

receive the output signal from the detector,

generate a digitally enhanced signal based at least partly on the output signal and

direct the digitally enhanced signal to the display, the display being configured to generate the image based at least partly on the digitally enhanced signal.

17. The method of claim 15, wherein the optics assembly comprises a collimating lens configured to direct the emitted beam to impinge upon the target, and a beam splitter configured to direct the portion of the radiation to the detector.

18. The method of claim 15, further comprising operably connecting a controller to the display, the light source, and the detector, the controller being configured to control the light source to emit the emitted beam at the particular temporal modulation.

19. The method of claim 18, further comprising disposing the light source and the controller within a substantially fluid-tight housing, the optics assembly being configured to direct the emitted beam to exit the housing.

20. The method of claim 15, further comprising disposing a cooling element in thermal contact with the light source.