The present invention provides a light sensor with dark current elimination. A dark current from a covered photodiode and a sensed current from a photodiode are respectively transformed to a dark voltage and a sensed voltage by a controlled integration circuit. A reverse capacitor receives the dark voltage and the sensed voltage to cancel out for each other, and outputs a corrected sensing voltage.

A laser detecting circuit is provided. The laser detecting circuit includes a latch circuit with a first inverter configured to invert a first output signal at a first node to generate a second output signal at a second node, and a second inverter configured to generate the first output signal based on the second output signal. The second inverter includes a plurality of PMOS transistors connected in series between a first source voltage and the first node, and a plurality of NMOS transistors. A gate of each of the plurality of PMOS transistors is connected to the second node, and a drain of each of the plurality of NMOS transistors is connected to the first node. The plurality of NMOS transistors includes dummy NMOS transistors and normal NMOS transistors.

Provided is an apparatus for measuring a light beam profile, comprising three rotary disks fixed on three positions of a rotary shaft connected to a motor at regular intervals, respectively while shifted by 120 degrees each other in a rotational direction, each rotary disk having three deformed holes with knife edges and six deformed holes defining light-passing openings and a photodetector arranged outside a set of the three rotary disks in a transmission direction of the light beam to receive the light beam passing through the three rotary disks.

An energy beam profiler and calorimeter (EPC) includes a target surface configured to receive an impinging energy beam to be profiled by the EPC and generate heat in response to the energy beam. The EPC also includes one or more first oscillating heat pipes (OHPs) arranged to transfer the heat away from a location at which the impinging energy beam strikes the target surface of the EPC. Other features are also provided.

A system and method for determining a filter clog. A method includes providing light to a fiber optic cable arranged on a filter, transmitting the light from the fiber optic cable, and detecting an intensity of the light. The method may include predicting a filter clog based on the detection of the intensity of the light; and providing an indication of the filter clog.

A detector (110, 1110, 2110) for determining a position of at least one object (112) is proposed. The detector (110, 1110, 2110) comprises: at least one transfer device (128, 1128), wherein the transfer device (128, 1128) has at least one focal length in response to at least one incident light beam (116, 1116) propagating from the object (112, 1112) to the detector (110, 1110, 2110); at least two optical sensors (113, 1118, 1120), wherein each optical sensor (113, 1118, 1120) has at least one light sensitive area (121, 1122, 1124), wherein each optical sensor (113, 1118, 1120) is designed to generate at least one sensor signal in response to an illumination of its respective light-sensitive area by the light beam (116, 1116), at least one evaluation device (132, 1132) being configured for determining at least one longitudinal coordinate z of the object (112, 1112) by evaluating a quotient signal Q from the sensor signals. The detector is adapted to determine the longitudinal coordinate z of the object in at least one measurement range independent from the object size in an object plane.

The present disclosure provides an optical imager and a method for imaging electromagnetic radiation. In one aspect, the optical imager includes an object array substantially located at an object plane, a first catadioptric element configured to substantially collimate, at a central plane, electromagnetic radiation emanating from the object array, a second catadioptric element configured to image the substantially collimated electromagnetic radiation from the central plane onto an image plane, and a detecting element substantially located at the image plane. The first catadioptric element includes at least one refractive surface and at least one reflective surface, and the second catadioptric element includes at least one refractive surface and at least one reflective surface.

The present disclosure relates to a method and device for detecting ambient light, an electronic device and a storage medium. The electronic device includes: a first screen, the first screen being a foldable flexible screen; multiple light sensors, orientations of light sensing surfaces of the multiple light sensors being different; and at least one processor electronically connected with the first screen and the light sensors respectively and configured to select a target light sensor from the multiple light sensors according to a present state of the first screen and obtain target detection data representing present ambient brightness according to detection data of the target light sensor.

A sensor device having a sensor housing and a printed circuit board coupled to the sensor housing. A light emitting device is coupled to the printed circuit board. The light emitting device has an emitter face defining an emission face area. An aperture plate is coupled to the sensor housing, the aperture plate defines an aperture having an aperture area that is less than the emission face area of the emitter face. The aperture is less than 1 mm from the emitter face wherein the light emitting device is not fixed to the aperture plate. A lens is coupled to the sensor housing, having an optical axis extending through the aperture. The aperture plate is positioned between the lens and the emitter face. Boresighting angle variation across sensor components on a manufacturing line may advantageously be reduced without increased cost associated with active alignment. Irradiance drop-out may also be reduced.

A sensor device having a sensor housing and a printed circuit board coupled to the sensor housing. A light emitting device is coupled to the printed circuit board. The light emitting device has an emitter face defining an emission face area. An aperture plate is coupled to the sensor housing, the aperture plate defines an aperture having an aperture area that is less than the emission face area of the emitter face. The aperture is less than 1 mm from the emitter face wherein the light emitting device is not fixed to the aperture plate. A lens is coupled to the sensor housing, having an optical axis extending through the aperture. The aperture plate is positioned between the lens and the emitter face. Boresighting angle variation across sensor components on a manufacturing line may advantageously be reduced without increased cost associated with active alignment. Irradiance drop-out may also be reduced.