Method for calibrating a photodetector (3), the method including the following steps: measuring an afterpulsing probability and/or timing of the photodetector (3) under different operating conditions defined by values of one or more operating parameters, at least one of which is a single-photon property of an optical signal (2) incident on the photodetector (3) when measuring the afterpulsing probability, and recording the measured afterpulsing probability and/or timing in relation to the values of the one or more operating parameters; and photodetector calibrated using this method.

Infrared sensing systems having improved vibration cancelation, and methods of achieving improved vibration cancelation. In one example, an infrared sensing system includes an infrared sensor configured to produce a sensor output signal representative of a response of the infrared sensor to infrared excitation and vibration excitation, an accelerometer configured to provide an acceleration signal responsive to the vibration excitation, and a controller, including an adaptive digital filter, coupled to the infrared sensor and to the accelerometer, and configured to receive the acceleration signal and to adjust coefficients of the adaptive digital filter so as to minimize coherence between a residual signal and the acceleration signal, the residual signal being a difference between the sensor output signal and a filter output signal from the adaptive digital filter.

A LiDAR system includes a first lens, a second lens, a first set of light sources and a first set of detectors positioned at a focal plane of the first lens, and a second set of light sources and a second set of detectors positioned at a focal plane of the second lens. Each detector of the second set of detectors is located at a respective detector position on the focal plane of the second lens that is optically conjugate with a position of a corresponding light source of the first set of light sources. Each detector of the first set of detectors is located at a respective detector position on the focal plane of the first lens that is optically conjugate with a position of a corresponding light source of the second set of light sources.

A photoelectric detection circuit and a photoelectric detector are provided. The photoelectric detection circuit includes a first sub-circuit and a second sub-circuit. The first sub-circuit includes a first photoelectric sensing element, and the second sub-circuit includes a second photoelectric sensing element, and an electrical characteristic of the first photoelectric sensing element is substantially identical to an electrical characteristic of the second photoelectric sensing element, and the second photoelectric sensing element is shielded to prevent light from being incident on the second photoelectric sensing element.

Embodiments of the present disclosure provide methods and apparatuses for detecting an ambient light illuminance and for computing a correction coefficient, and an electronic device. The method for detecting an ambient light illuminance includes: filtering ambient light based on a monochromatic channel, such that a quantum efficiency curve of the filtered light matches a spectral luminous efficiency curve; and performing photoelectric detection on the filtered light to obtain an illuminance level of the ambient light. In solutions of the embodiments of the present disclosure, the photoelectric detection may be equivalent to obtaining an illuminance level of light by convolutional computation based on a spectral luminous efficiency curve, and therefore, when the quantum efficiency curve for a monochromatic waveband obtained by filtering ambient light based on a monochromatic channel matches the spectral luminous efficiency curve, a reliable spectral luminous efficiency curve can be obtained with a small computing workload.

Systems and methods are provided for filtering coherent infrared light from a thermal background for protection of infrared (IR) imaging arrays and detection systems. A Michelson interferometer is used for coherent light filtering. In an implementation, a system includes a fixed mirror, a beam splitter, and a moving mirror which can be controlled translationally, as well as tip/tilt. The Michelson interferometer may be used as an imaging system. For imaging applications, a system may comprise a tunable array of micro-electromechanical systems (MEMS) mirrors. A mid-wave IR interferometer with electronic feedback and MEMS mirror array is provided.

An electromagnetic wave detector 100 comprises: a substrate 5 having a front surface and a back surface; an insulating layer 4 formed of a rare earth oxide, which is provided on the front surface of the substrate 5; a pair of electrodes 2 provided on the insulating layer 4 so as to be arranged to face each other across a gap; and a two-dimensional material layer 1 provided on the insulating layer 4 so as to be electrically connected to the pair of electrodes 2. The rare earth oxide contains a base material made of an oxide of a first rare earth element, and a second rare earth element different from the first rare earth element, which is activated in the base material.

A system and method for preventing sight deterioration caused by prolonged use of electronic visual displays in low-light conditions is provided. The system includes a camera directed towards a user, a processing circuitry, control circuitry and, optionally, a light sensor. The processing circuitry determines the illuminance of a user's face, and in case it falls outside of a predefined range (putting the user at risk of future sight deterioration and progression of myopia), the device stores the illuminance data and/or sends a control signal to circuitry operative to notify the user. If processing circuitry determines that the illuminance is equal or greater than the predefined illuminance, the circuitry operative can stop the notification. The notification can be modulated by any combination of the illuminance and the time of use.

The present invention relates to an apparatus that uses shadow images of cells to continuously measure cell activity at a high processing rate in order to provide cell activity and cell number results. According to one embodiment of the present invention, instead of a highly experienced examiner or technician using a microscope, ELISA reader, etc. having to collect various cell activity measurements and cell numbers, the collection of said information can be automated so as to reduce cost and largely reduce errors in measurements through the development of computer software coupled with hardware using low cost and compact optoelectronic components and simple image processing techniques.

A mobile terminal including a display panel, a light sensor, and a first polarizing component. The display panel is between the first polarizing component and the light sensor. The ambient light having passed through the first polarizing component is linear polarized light. The light sensor includes N first regions and M second regions, the total area of the N first regions is equal to that of the M second regions. Each of the first regions includes a second polarizing component and K photodetectors. The second polarizing component is located above the K photodetectors. Each of the second regions includes a third polarizing component and L photodetectors. The third polarizing component is located above the L photodetectors. The polarization direction of the second polarizing component is parallel to that of the first polarizing component. The polarization direction of the second polarizing component is perpendicular to that of the third polarizing component.