Mobile system incorporating flexible and tunable anti-reflective skin and method of use

• US 9,841,616 B1
• Filed: 12/16/2016
• Issued: 12/12/2017
• Est. Priority Date: 08/22/2014
• Status: Active Grant

• Current Assignee: Sunlight Aerospace Incorporated
• Original Assignee: Sunlight Photonics Incorporated
• Inventors: Bruce, Allan James, Frolov, Sergey, Cyrus, Michael
• Primary Examiner(s): Won, Bumsuk
• Assistant Examiner(s): Huang, Wen
• Application Number:
  US15/382,276
• Time in Patent Office: 361 Days
• Field of Search: 359237-239
• CPC Class Codes: G02B 1/11 Anti-reflection coatings
• CPC Class Codes: G02B 1/111 using layers comprising organic materials
• CPC Class Codes: G02B 26/001 based on interference in an adjustable optical cavity interference filters G02B5/28; devices or arrangements using multiple reflections in spectrometry or monochromators G01J3/26
• CPC Class Codes: G02F 1/0121 Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
• CPC Class Codes: H04B 10/112 Line-of-sight transmission over an extended range
• CPC Class Codes: H04N 23/60 Control of cameras or camera modules

Abstract

A mobile system includes a self-supporting platform, a tunable anti-reflective (AR) skin or film disposed on and secured to the mobile platform, one or more actuators and a controller. The tunable AR skin or film includes one or more layers that are at least partially transmitting to optical energy at one or more optical wavelengths. The skin or film is substantially flexible and/or stretchable and has an optical AR to incident electromagnetic radiation of a given wavelength which is selectively variable when flexed and/or stretched. The actuators are able to flex and/or stretch the skin or film in response to receipt of a control signal. The controller generates the control signal based on a measured value of the electromagnetic radiation transmitted through the tunable AR skin or film.

Claims

1. A method for enhancing one or more optical performance parameters of an optical receiving device, comprising:

measuring a value of electromagnetic radiation of a given optical wavelength that is transmitted to an optical receiving device through at least one antireflective (AR) layer, the AR layer being at least partially transmissive to optical energy at one or more optical wavelengths, the at least one layer being substantially flexible and/or stretchable and having AR characteristics to incident electromagnetic radiation of a given wavelength which is selectively variable when flexed and/or stretched; and

based on the measured value of the electromagnetic radiation transmitted through the at least one AR layer, causing the AR layer to be flexed and/or stretched to thereby tune one or more AR characteristics of the AR layer to enhance one or more optical performance parameters of the optical receiving device.

2. The method of claim 1 further comprising tuning the one or more AR characteristics of the AR layer to enhance one or more performance parameters of the optical receiving device.

3. The method of claim 1 further comprising tuning the one or more AR characteristics of the AR layer to enhance remote optical imaging performed by the optical receiving device.

4. The method of claim 1 wherein the optical receiving device is an optical communication receiver and further comprising tuning the one or more AR characteristics of the AR layer to enhance performance of the optical communication receiver.

5. The method of claim 1 further comprising measuring the value of the electromagnetic radiation transmitted through the at least one AR layer using an optical monitoring device.

6. The method of claim 1 further comprising measuring the value of the electromagnetic radiation transmitted through the at least one AR layer using the optical receiving device.

7. The method of claim 1 wherein the optical receiving device is located on a mobile platform and the AR layer is a film or skin covering at least a portion of a surface of the mobile platform.

8. The method of claim 7 further comprising causing different portions of the film or skin to be flexed and/or stretched by different amounts to thereby impart different AR characteristics to the different portions of the film or skin.

28. The method of claim 1 further comprising calculating a value of transmittance or reflectance of the AR layer using a calibrated light source.

9. A mobile system, comprising:

a self-supporting platform;

at least one anti-reflective (AR) layer disposed on and secured to the mobile platform, the at least one layer being at least partially transmissive to optical energy at one or more optical wavelengths, the at least one layer being substantially flexible and/or stretchable and having AR characteristics to incident electromagnetic radiation of a given wavelength which is selectively variable when flexed and/or stretched;

one or more actuators for flexing and/or stretching the at least one AR layer in response to receipt of a control signal; and

a controller for generating the control signal based on a measured value of the incident electromagnetic radiation of the given wavelength that is transmitted through the at least one AR layer.

10. The mobile system of claim 9 further comprising at least one optical receiving device located to receive the incident electromagnetic radiation that is transmitted through the at least one AR layer.

11. The mobile system of claim 10 wherein the at least one optical receiving device is located between the at least one AR layer and the one or more actuators.

12. The mobile system of claim 10 wherein the at least one optical receiving device is configured to measure the transmittance of the incident electromagnetic radiation and provide the measured value to the controller.

13. The mobile system of claim 9 wherein the one or more actuators are configured to cause the AR characteristics of the at least one AR layer to be dynamically tuned by flexing and/or stretching the at least one AR layer in response to the control signal being dynamically adjusted based on sequential measurements of the measured value of the transmittance of the at least one AR layer.

14. The mobile system of claim 9 wherein the one or more actuators are selected from the group consisting of thermal, piezo-electric, magnetic, electro-active, pneumatic and hydraulic activated devices.

15. The mobile system of claim 9 wherein the self-supporting platform is selected from the group consisting of an Unmanned Aerial Vehicle (UAV), an Unmanned Marine Vehicle (UMV), an Unmanned Ground Vehicle (UGV) or a wearable platform.

16. The mobile system of claim 9 further comprising an optical monitor located on the platform for monitoring the transmittance of the at least one layer and providing the measured value of the transmittance to the controller.

17. The mobile system of claim 9 wherein the optical receiving device is an optical imaging device and the controller is configured to generate the control signal so that the transmittance of the at least one layer is tuned to enhance optical imaging of the mobile system.

18. The mobile system of claim 9 wherein the optical receiving device is an optical communication receiver.

19. The mobile system of claim 18 wherein the controller is configured to generate the control signal so that the transmittance of the at least one AR layer is tuned to enhance the performance of the optical communication receiver.

20. The mobile system of claim 18 wherein the optical communication receiver includes a photovoltaic device.

21. The mobile system of claim 9 further comprising an optical transmitter underlying the at least one AR layer.

22. The mobile system of claim 21 wherein the controller is configured to generate the control signal so that the transmittance of the at least one AR layer is tuned to enhance the performance of the optical transmitter.

23. The mobile system of claim 9 wherein the one or more actuators includes a plurality of actuators for flexing and/or stretching different portions of the at least one AR layer independently of one another, the controller being configured to provide different control signals to the different actuators.

24. The mobile system of claim 9 further comprising one or more optical monitors remotely located from the platform for monitoring the transmittance of the at least one AR layer and providing measured value(s) of the transmittance to the controller.

25. The mobile system of claim 9 wherein the controller is further configured to generate the control signal based on coordination with one or more additional mobile platforms that have a tunable AR layer.

26. The mobile system of claim 9 wherein the controller is further configured to generate the control signal based on machine-to-machine communication with at least one device remotely located from the mobile platform.

27. The mobile system of claim 9 wherein the controller is further configured to generate the control signal by accessing a data base of previously learned responses to adjustments of the AR characteristics of the at least one AR layer.

29. A method for enhancing one or more optical performance parameters of an optical receiving device, comprising:

measuring one or more optical performance parameters of an optical receiving device that receives an optical signal that is transmitted to the optical receiving device through at least one antireflective (AR) layer, the AR layer being at least partially transmissive to optical energy at one or more optical wavelengths, the at least one layer being substantially flexible and/or stretchable and having AR characteristics to incident electromagnetic radiation of a given optical wavelength which is selectively variable when flexed and/or stretched; and

based on measured values of the one or more optical performance parameters, causing the AR layer to be flexed and/or stretched to thereby tune one or more AR characteristics of the AR layer to enhance the one or more optical performance parameters of the optical receiving device.