Day/night filter glass for aircraft camera systems
A technique for using an onboard camera capable of day and night operation on an unmanned aerial vehicle (UAV) includes: traveling along a route of the UAV at night; and acquiring an aerial image with an onboard camera. The onboard camera includes: a sensor device for receiving photons and converting the photons into photoelectrons; a processor for processing the photoelectrons into an image file; a lens positioned adjacent to the sensor device for focusing the photons on the sensor device; and a filter positioned adjacent an outer surface of the lens. The filter can permit photons in the infrared light spectrum to pass to the lens, and attenuate at least a portion of the photons in the visible light spectrum prior to reaching the lens.
1 . A non-transitory computer-readable medium having logic stored thereon that, in response to execution by one or more processors of an unmanned aerial vehicle (UAV), causes the UAV to perform actions comprising:
traveling along a route of the UAV at night; and
acquiring an aerial image with an onboard camera, the onboard camera comprising:
a sensor device for receiving photons and converting the photons into photoelectrons;
a processor for processing the photoelectrons into an image file;
a lens positioned adjacent to the sensor device for focusing the photons on the sensor device; and
a filter positioned adjacent to an outer surface of the lens, wherein the filter has a first transmission property that permits a majority of the photons in an infrared light spectrum from 840 nm to 860 nm to pass to the lens, and wherein the filter has a second transmission property that attenuates a majority of the photons in a visible light spectrum from 430 nm to 640 nm prior to reaching the lens, wherein the second transmission property reduces oversaturation of the sensor device during daytime operations of the UAV while the first transmission property enables use of an infrared illuminator on the UAV during nighttime operations of the UAV.
2 . The non-transitory computer-readable medium of claim 1 , further comprising activating an infrared illuminator during acquiring the aerial image with the onboard camera.
3 . The non-transitory computer-readable medium of claim 1 , wherein the sensor device is a grayscale monochrome sensor.
4 . The non-transitory computer-readable medium of claim 1 , wherein the second transmission property attenuates from 28% to 50% of the photons in the visible spectrum, and the first transmission property permits greater than or equal to 80% of the photons in the infrared spectrum.
5 . The non-transitory computer-readable medium of claim 4 , wherein the filter has a reflectivity property of less than or equal to 3% at wavelengths from 400 nm to 900 nm.
6 . The non-transitory computer-readable medium of claim 5 , wherein the filter has a third transmission property of less than or equal to 5% at wavelengths in the infrared spectrum from 950 nm to 1000 nm.
7 . The non-transitory computer-readable medium of claim 1 , wherein the filter is removably couplable to the lens with a double-sided adhesive tape having water-resistance and shock-resistance properties.
8 . The non-transitory computer-readable medium of claim 1 , further comprising transmitting the image file of the aerial image from the onboard camera to a UAV control system via a communication interface.
9 . The non-transitory computer-readable medium of claim 8 , further comprising transmitting the image file of the aerial image to a fleet management system.
10 . The non-transitory computer-readable medium of claim 8 , further comprising analyzing the image file of the aerial image to visually triangulate the position of the UAV.
11 . The non-transitory computer-readable medium of claim 8 , further comprising:
analyzing the image file of the aerial image to detect obstacles; and
adjusting the route to an adjusted route that deconflicts with the detected obstacle.
12 . The non-transitory computer-readable medium of claim 1 , further comprising:
traveling along a second route of the UAV during the day; and
acquiring a second aerial image with the onboard camera.
13 . At least one non-transitory machine-accessible storage medium that provides instructions that, when executed by a controller of an unmanned aerial vehicle (UAV), will cause the UAV to perform operations, comprising:
traveling along a first route of the UAV at night;
acquiring a nighttime aerial image;
traveling along a second route of the UAV during the day; and
acquiring a daytime aerial image,
wherein the nighttime and daytime aerial images are acquired with an onboard camera, the onboard camera comprising:
a sensor device for receiving photons and converting the photons into photoelectrons;
a lens positioned adjacent to the sensor device for focusing the photons on the sensor device; and
a day/night filter positioned adjacent to an outer surface of the lens, wherein the filter has a first transmission property that permits a majority of the photons in an infrared light spectrum from 840 nm to 860 nm to pass to the lens, and wherein the filter has a second transmission property that attenuates a majority of the photons in a visible light spectrum from 430 nm to 640 nm prior to reaching the lens, wherein the second transmission property reduces oversaturation of the sensor device during daytime operations of the UAV while the first transmission property enables use of an infrared illuminator on the UAV during nighttime operations of the UAV.
14 . The at least one non-transitory machine-accessible storage medium of claim 13 , further comprising activating an infrared illuminator during acquiring the nighttime aerial image with the onboard camera.
15 . The at least one non-transitory machine-accessible storage medium of claim 13 , wherein the sensor device is a grayscale monochrome sensor.
16 . The at least one non-transitory machine-accessible storage medium of claim 13 , wherein the second transmission property attenuates from 28% to 50% of the photons in the visible spectrum, and the first transmission property permits greater than or equal to 80% of the photons in the infrared spectrum.
17 . The at least one non-transitory machine-accessible storage medium of claim 16 , wherein the filter has a reflectivity property of less than or equal to 3% at wavelengths from 400 nm to 900 nm.
18 . The at least one non-transitory machine-accessible storage medium of claim 17 , wherein the filter has a third transmission property of less than or equal to 5% at wavelengths in the infrared spectrum from 950 nm to 1000 nm.
19 . The at least one non-transitory machine-accessible storage medium of claim 13 , wherein the filter is removably couplable to the lens with a double-sided adhesive tape having water-resistance and shock-resistance properties.
20 . The at least one non-transitory machine-accessible storage medium of claim 13 , further comprising transmitting at least one of the nighttime aerial image or the daytime aerial image from the onboard camera to a UAV control system via a communication interface.
21 . The at least one non-transitory machine-accessible storage medium of claim 20 , further comprising transmitting at least one of the nighttime aerial image or the daytime aerial image to a fleet management system.
22 . The at least one non-transitory machine-accessible storage medium of claim 20 , further comprising analyzing the nighttime or daytime aerial image to visually triangulate the position of the UAV.
23 . The at least one non-transitory machine-accessible storage medium of claim 20 , further comprising:
analyzing the nighttime or daytime aerial image to detect obstacles; and
adjusting the first and/or second route to an adjusted route that deconflicts with the detected obstacle.
24 . A unmanned aerial vehicle (UAV), comprising:
an onboard camera including an image sensor adapted for receiving photons and converting the photons into photoelectrons;
an infrared emitter adapted to generate infrared illumination;
a processor coupled to the onboard camera for processing the photoelectrons into an image file; and
a filter positioned over a lens of the onboard camera, wherein the filter has a first transmission property that permits a majority of the photons in an infrared light spectrum from 840 nm to 860 nm to pass to the lens, and wherein the filter has a second transmission property that attenuates a majority of the photons in a visible light spectrum from 430 nm to 640 nm prior to reaching the lens, wherein the second transmission property reduces oversaturation of the sensor device during daytime operations of the UAV while the first transmission property enables use of the infrared illuminator on the UAV during nighttime operations of the UAV.