In a light detection device, a circuit substrate includes a plurality of signal processing units which process a detection signal output from a corresponding pixel. Light-receiving regions of a plurality of avalanche photodiodes are two-dimensionally arranged for every pixel. In each of the signal processing units, a timing measurement unit measures timing at which light is incident on a corresponding pixel, based on the detection signal. An energy measurement unit measures energy of light incident on a corresponding pixel, based on the detection signal. A storage unit stores a measurement result in the timing measurement unit and the energy measurement unit. A light detection region where a plurality of the pixels are provided and a signal processing region where a plurality of the signal processing units are provided overlap each other at least at a part.

An analog front-end circuit includes an array of pixel circuits. Each pixel circuit includes an event counter and a power consumption circuit. The event counter is configured to count photons incident at the pixel circuit. The power compensation circuit includes an event rate circuit and a current sink circuit. The event rate circuit is configured to determine a rate of photon detection events at the pixel circuit. The current sink circuit is configured to pass a compensation current selected based on the rate of photon detection events at the pixel circuit.

Aspects of the present disclosure include methods for determining a parameter of a photodetector (e.g., a photodetector in a particle analyzer). Methods according to certain embodiments include irradiating a photodetector positioned in a particle analyzer with a light source (e.g., a continuous wave light source) at a first intensity for a first predetermined time interval, irradiating the photodetector with the light source at a second intensity for a second predetermined time interval, integrating data signals from the photodetector over a period of time that includes the first predetermined interval and the second predetermined interval and determining one or more parameters of the photodetector based on the integrated data signals. Systems (e.g., particle analyzers) having light source and a photodetector for practicing the subject methods are also described. Non-transitory computer readable storage medium having instructions stored thereon for determining a parameter of a photodetector according to the subject methods are also provided.

Aspects of the present disclosure include methods for determining a parameter of a photodetector (e.g., a photodetector in a particle analyzer). Methods according to certain embodiments include irradiating a photodetector positioned in a particle analyzer with a light source (e.g., a continuous wave light source) at a first intensity for a first predetermined time interval, irradiating the photodetector with the light source at a second intensity for a second predetermined time interval, integrating data signals from the photodetector over a period of time that includes the first predetermined interval and the second predetermined interval and determining one or more parameters of the photodetector based on the integrated data signals. Systems (e.g., particle analyzers) having light source and a photodetector for practicing the subject methods are also described. Non-transitory computer readable storage medium having instructions stored thereon for determining a parameter of a photodetector according to the subject methods are also provided.

An integrated photodetecting optoelectronic semiconductor component configured to deliver an output signal indicative of the intensity of light irradiating the component. The component may include a SPAD-based main detection device configured to detect incoming photons and to deliver an output signal based on the detected photons. The component may also include a SPAD-based reference detection device proximate to the main detection device where the reference detection device has the same electro-optical behaviour as the main detection device, is configured to detect incoming photons, configured to deliver a reference signal based on the detected photons, and has a light inlet for incoming photons. The component may also include a neutral density filtering device and a controller configured to determine a nominal output signal, compare the nominal output signal with the output signal delivered by the main detection device, and adjust an operating parameter based on the comparison.

Provided is an optical sensor including: a first photodetector including a first photodiode and having a first wavelength sensitivity characteristic; a first resistor having one end connected to a cathode of the first photodiode, and another end connected to a ground point; a second photodetector including a second photodiode and having a second wavelength sensitivity characteristic; a second resistor having one end connected to a cathode of the second photodiode, and another end connected to the ground point; and an amplifier circuit having a first input terminal connected to the first photodiode, a second input terminal connected to the second photodiode, and an output terminal configured to output a potential based on a potential of the first input terminal and a potential of the second input terminal, and using, as an operating power supply, electric power generated by electromotive force of the first photodetector and the second photodetector.

An occupancy sensor covering a wide field in an integrated chip is disclosed. The occupancy sensor includes an array of grating coupled waveguide sensors wherein continuous wave (cw) signals monitor an ambient light field for dynamic changes on times scales of seconds, and high frequency signals map in three-dimensions of the space using time-of-flight (TOF) measurements, pixel level electronics that perform signal processing; array level electronics that perform additional signal processing; and communications and site level electronics that interface with actuators to respond to occupancy sensing.

The present disclosure is directed to irradiance sensing devices and methods. One such device includes a housing and an optical diffuser coupled to the housing. The housing has an opening that extends into the housing from an outer surface, and the opening has a circular shape at the outer surface of the housing. The optical diffuser has a first region that extends at least partially beyond the outer surface of the housing and a second region housed within the housing. The first region of the optical diffuser has a curved surface, and the optical diffuser includes a cavity extending at least partially into the second region.

A sensor device according to the present technology includes: a pixel array unit in which a plurality of pixel units each having one or a plurality of pixels and capable of generating a gradation signal indicating intensity of a light reception amount and an event signal indicating a change in the light reception amount is two-dimensionally arranged; and a row control unit that can sequentially execute in rows selection of a pixel from which the event signal is to be read and selection of a pixel from which the gradation signal is to be read at different timings.

The present invention is in the field of a geometrically and spectrally resolved albedometer for a PV-module, a method of determining characteristics of reflected light, a method of optimizing reflected light performance of a solar cell, and a computer program for geometrically and spectrally resolving light.