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.

In an example, a system includes a surface including one or more light sources and one or more sensors. The system also includes a dome structure configured to cover the surface. The system includes an output port on the surface configured to provide light from the one or more light sources to a device under test. The system also includes a controller coupled to the one or more sensors and configured to adjust the one or more light sources based at least in part on feedback from a sensor.

The present invention relates to a light sensing system for sensing ambient light intensity, comprising a light sensing device with at least one light sensor and a calibration device for calibrating the sensor. The calibration device comprises at least one light source that emits light with a standard intensity. The invention is further related to a corresponding method for calibrating a light sensing device, comprising the illumination of the light sensor of the light sensing device with light that has a standard intensity, the comparison of the output intensity signal of the sensor with an expected signal that corresponds to the standard intensity, and the matching of the output intensity signal of the sensor to the expected signal by adjusting a gain parameter of the sensor.

Certain embodiments provide a self-checking photoelectric sensor that is configured to determine a characteristic (e.g., an amount of blockage and/or wellness/decay) of an optical pathway (e.g., an electro-optical pathway). An example method generally includes increasing, over a time period that starts at a first time, a current input to a light emitting element (LEE). The method generally includes receiving, by a light detection element, an output of the LEE via the optical pathway during the time period. The method generally includes converting, during the time period, the LEE output to a voltage output. The method generally includes determining a second time in the time period when the voltage output crosses a threshold. The method generally includes determining the characteristic of the optical pathway between the LEE and the light detection element based on a difference between the second time and the first time.

A method of estimating non-linearity in a response of an optical detector comprises emitting optical radiation at different intensities. The method includes, at each intensity: amplitude modulating the emitted optical radiation at a modulating frequency to produce amplitude modulated optical radiation; detecting the amplitude modulated optical radiation with the optical detector to produce a detected waveform; and generating a Fourier transform of the detected waveform that includes a fundamental frequency equal to the modulating frequency and harmonics thereof. The method further includes estimating the non-linearity in the response of the optical detector based on a change in an amplitude of a second harmonic of the fundamental frequency relative to an amplitude of the fundamental frequency across the Fourier transforms corresponding to the different intensities.

A display that can play dynamic video imagery using purely infrared light. Such dynamic video imagery is useful in testing infrared detection equipment. The display contains thousands of solid state infrared LEDs. Different infrared LED types are used. Each type of LED in use emits infrared light in some selected band of the infrared spectrum. The overall display can be designed to simulate infrared signal sources for a particular type of infrared detection system. If a particular infrared detection system detects infrared energy only in a specific range, the infrared LED display can be made to have a high resolution of LEDs within that specific range and a lower resolution of LEDs outside that specific range that would be useful for calibration purposes.

Methods, systems, and apparatus for a stray-light testing apparatus. In one aspect, the apparatus includes an optical assembly including a spatially extended light source and one or more optical elements arranged to direct light from the spatially extended light source along an optical path, a moveable frame supporting the optical assembly including one or more adjustable alignment features for guiding positioning of the stray-light testing apparatus relative to an onboard camera on a vehicle, and a shrouding mechanism attached to the frame and positioned on the frame such that, when the stray-light testing apparatus is aligned relative to the onboard camera on the vehicle and the optical path of the optical assembly is within the field of view of the onboard camera, ambient light exposure for the onboard camera is below a threshold.

An electronic device includes a processor and a memory. The processor obtains a group of original specification data of an ambient light sensor, obtains a group of testing data of the ambient light sensor, combines the group of original specification data with the group of testing data to obtain a group of combined data, and analyzes the group of combined data according to a source of the plurality of data and a corresponding wavelength of the plurality of data to obtain a spectral hand table and a channel distribution table of the ambient light sensor.

A light barrel configured to filter out stray light of a test light includes a casing and a number of light shield plates arranged within the casing. The light shield plates are parallel to each other and arranged within the casing along a direction in which the light source emits the test light. Each of the light shield plates defines a through hole for light from the test light to pass through. The through holes of the light shield plates are a same size and aligned. The light shield plates sequentially filter out stray light that does not pass through the through holes.