A spectrophotometer includes a photodetection unit configured to convert received light into an electric signal to output the electric signal; a circuit unit including a plurality of gain amplifiers and a plurality of AD converters configured to amplify an output signal from the photodetection unit by a plurality of gains using the plurality of gain amplifiers and configured to convert the amplified output signals into digital signals using the plurality of AD converters to output the digital signals as a plurality of pieces of light amount data; a saturation determination unit configured to determine whether or not each of the plurality of pieces of light amount data from the circuit unit has been saturated; and a measurement result calculation unit configured to calculate, in accordance with a result of the determination by the saturation determination unit, a measurement result of the received light using a part or all of the plurality of pieces of light amount data.

A process for producing a total match metric for matching color and appearance of a target coating and at least a specimen coating is provided. The total match metric (TMM) are produced based on color difference values (ΔE) at three or more color viewing angles, sparkle difference values (ΔS) at one or more sparkle viewing angles and flop difference value (Δf) between the target coating and the specimen coating using one or more linear functions, one or more non-linear functions, or a combination thereof. The total match metric can be used in producing matching coatings that match color and appearance of the target coating. The total match metric can be particularly useful for repair coating damages to vehicles.

An illumination device described herein includes at least a phosphor converted LED, which is configured for emitting illumination for the illumination device, a first photodetector and a second photodetector. A spectrum of the illumination emitted from the phosphor converted LED comprises a first portion having a first peak emission wavelength and a second portion having a second peak emission wavelength, which differs from the first peak emission wavelength. The first photodetector has a detection range, which is configured for detecting only the first portion of the spectrum emitted by the phosphor converted LED. The second photodetector has a detection range, which is configured for detecting only the second portion of the spectrum emitted by the phosphor converted LED. Methods are provided herein for calibrating and controlling each portion of the phosphor converted LED spectrum, as if the phosphor converted LED were two separate LEDs.

An electronic device may be provided with a display mounted in a housing. The display may have an array of pixels that form an active area and may have an inactive area that runs along an edge of the active area. A color ambient light sensor may gather ambient light measurements through a window in an opaque masking layer in the inactive area. The color ambient light sensor may have photodiodes with different spectral sensitivities and may have a dark current photodiode that is insensitive to light. A set of analog-to-digital converters may be used to digitize photodiode signals from the photodiodes. A switch array may be used to distribute signals from the photodiodes to each of the analog-to-digital converters. This allows the output of each photodiode to be averaged over multiple analog-to-digital converters to remove any impact of variations in performance between converters.

In some embodiments, apparatus and systems, as well as methods, may operate to select from multiple optical detectors and/or multiple detector amplifiers to form combinations of detectors and amplifiers as part of an optical detection system. The selection may be based on minimizing noise equivalent power (NEP) of the optical detector or a combination of an optical detector and a detector amplifier over a desired temperature range. Additional apparatus, systems, and methods are disclosed.

There are provided an optical receiver and a laser radar including the same. The optical receiver includes a plurality of optical detecting units configured to convert an optical signal reflected from a target into an electrical signal and to output the electrical signal, a signal combiner configured to combine output signals of the plurality of light detecting regions, a plurality of switches provided between the plurality of optical detecting units and the signal combiner, and a controller configured to control the plurality of switches so that the plurality of optical detecting units are selectively connected to the signal combiner based on whether the optical signal to reflected from the target is input. Therefore, it is possible to make a module small, to improve stability and reliability, and to reduce a signal to noise ratio.

An ambient light detector, a detector array and a method are disclosed. An ambient light sensor includes a first plurality of sensor elements, where each sensor element is configured to provide a signal in response to a level of illumination and a second plurality of reference elements, each reference element configured to provide a reference signal and each including a blocking element configured to shield the respective reference element from being illuminated, where the first plurality is larger than the second plurality and the first plurality of sensor elements and the second plurality of reference elements are arranged in an array, and where a sensor element and a reference element are laterally arranged on or in a common layer substrate sharing at least one common first contact.

A control method of an infrared detector, for obtaining a wider dynamic range and preventing an over-range, is disclosed. The method includes: monitoring a value acquired in response to an electric current flowing in each of a plurality of infrared detection elements configuring the infrared detector, and lowering, when the value acquired in response to the electric current flowing in the infrared detection element reaches a threshold value within a detection time, sensitivity of the infrared detection element within the detection time.

A system for amplification of optical signals for optical measurement instrumentation is disclosed. The system may include a first logarithmic amplifier circuit in a first amplification path, and a linear amplifier circuit and a second logarithmic amplifier circuit coupled in series in a second amplification path. The first and second amplification paths may receive an input signal from a photodiode and provide amplified signals, in parallel, to a selection circuit, which may select one of the outputs of the first and second amplification paths based on one or two power thresholds. The selection circuit may then provide the selected output to a measurement circuit or device. In some examples, the system may also include a sampling circuit to sample the outputs and an analog-digital conversion circuit to digitize the outputs before selection. The power threshold(s) may be determined based on a saturation level of the linear amplifier circuit.

A wearable computing device includes an electronic display with a configurable brightness level setting, a physiological metric sensor system including a light source configured to direct light into tissue of a user wearing the wearable computing device and a light detector configured to detect light from the light source that reflects back from the user. The device may further include control circuitry configured to activate the light source during a first period, generate a first light detector signal indicating a first amount of light detected by the light detector during the first period, deactivate the light source during a second period, generate a second light detector signal indicating a second amount of light detected by the light detector during the second period, generate a physiological metric based at least in part on the first light detector signal and the second light detector signal, and modify the configurable brightness level setting based on the second light detector signal.