Sensors and systems for the capture of scenes and events in space and time
Various embodiments comprise apparatuses and methods including a light sensor. The light sensor includes a first electrode, a second electrode, a third electrode, and a light-absorbing semiconductor in electrical communication with each of the first electrode, the second electrode, and the third electrode. A light-obscuring material to substantially attenuate an incidence of light onto a portion of the light-absorbing semiconductor is disposed between the second electrode and the third electrode. An electrical bias is to be applied between the second electrode, and the first and the third electrodes and a current flowing through the second electrode is related to the light incident on the light sensor. Additional methods and apparatuses are described.
1. Imaging apparatus, comprising:
an image sensor, comprising an array of pixels, which are configured to output signals in response to light that is incident on the pixels over a range of sensitivity of the pixels that extends from visible wavelengths to at least 1600 nm;
an optical filter, which is placed so as to block incidence on the image sensor of near infrared light in a stopband extending from beyond 700 nm to at least 1400 nm; and
a processor, which is configured to receive and process the output signals from the image sensor so as both to acquire a first, visible-wavelength image and to acquire a second, infrared image in response to the light that is incident on the image sensor in a passband of wavelengths greater than 1450 nm.
2. The apparatus according to claim 1 , wherein the optical filter is further configured to block wavelengths greater than 1600 nm, whereby the infrared image is acquired in the passband between 1450 and 1600 nm.
3. The apparatus according to claim 1 , and comprising an infrared light source, which emits radiation in the passband greater than 1450, and wherein the infrared image is acquired in response to the radiation emitted by the infrared light source.
4. The apparatus according to claim 3 , wherein the infrared light source is configured to emit structured radiation, and wherein the processor is configured to process the infrared image so as extract depth information responsively to the structured radiation.
5. The apparatus according to claim 3 , wherein the infrared light source is configured to operate periodically, so that the visible-wavelength image and the infrared image are acquired in alternation.
6. The apparatus according to claim 1 , wherein the processor is configured to acquire a stream of the images from the image sensor and to recognize a gesture based on the images.
7. The apparatus according to claim 1 , wherein the image sensor comprises a film of quantum dots.