Gram-scale StarChip components | 4 cameras

Sub-gram-scale 2 megapixel cameras are currently widely available at very low costs. The trend has been a doubling of pixels for the same mass every two years. It is anticipated that these devices will continue this trend for some time. Advances in planar Fourier capture array cameras should make it possible to eliminate the need for focusing optics in the cameras. Advances in Fresnel lens imaging and planar Fourier capture array cameras should make it possible to build focusing optics in the cameras light enough to be used in the mission, or eliminate the need for focusing optics altogether.

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Feb 26, 2018 21:26 Breakthrough Initiatives Posted on: Breakthrough Initiatives

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Thank you for your contribution.

Mar 16, 2018 16:44 Richard Boutilier Posted on: Centauri Dreams

I am sure this has already been answered in the forum, but, if someone wouldn't mind repeating the answer, I am wondering if the reported "continent"-sized resolution of the probes is based on only the nano-craft's optics or includes using the deformable light-sail as a reflector-style telescope collector dish for the probes?

May 14, 2018 22:41 Breakthrough Initiatives Posted on: Breakthrough Initiatives

Thank you for your comments. We are considering using less than 1 meter of the deformable sail to image the target planet. When we understand our ability to manipulate the sail we will have a better estimate on how well we can image the target.

- Pete Klupar, Breakthrough Starshot

Sep 13, 2018 16:15 Breakthrough Initiatives Posted on: Breakthrough Initiatives

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The angular resolution of images obtainable by cameras aboard the craft will be at best the diffraction limit, roughly the wavelength of the light divided by the size of the camera's aperture. This angular resolution will correspond to a particular length scale proportional to the distance between the planet and the camera at the time the image is captured. If this distance is about the Earth-Sun separation (namely 1 AU), the image is taken with optical light (namely a wavelength of ~700 nm), and the camera's aperture is about 10 cm in size, then the implied resolution of the image at the planet is ~1000 km, namely continent-scale. At this point none of the above-mentioned parameter values are set in stone - a nanocraft may be able to pass much closer to the planet, especially if many of them are sent. The lightsail itself may be usable as a reflecting telescope as you suggest, which would improve the resolution of the image all else equal. Meanwhile the design of the lightsail will likely be set primarily by the requirement that it rides stably on the laser beam without heating up too much in the process, then potentially by its usability as an antenna to aid in transmitting data back to Earth. If it can be used to aid in imaging the planet, all the better, but more research and development is needed before we can say if it will also be useful for the optics of the camera (since the tolerance in the precision of its shape when used a camera aperture depends sensitively on the choice of the transmission wavelength).

- John Forbes and Avi Loeb (Harvard), Breakthrough Starshot

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