Embodiments of the invention generally relate to color and appearance metric measurements and, in particular, developing instrumentation to enable self-consistent image appearance measurements within instruments of unitary construction.

An optical sensor system may include a light source. The optical sensor system may include a concentrator component proximate to the light source and configured to concentrate light from the light source with respect to a measurement target. The optical sensor system may include a collection component that includes an array of at least two components configured to receive light reflected or transmitted from the measurement target. The optical sensor system may include may a sensor. The optical sensor system may include a filter provided between the collection component and the sensor.

An automated calibration system that includes a probe guide and a target assembly. The probe guide receives an optical probe, and the target assembly includes one or more calibration targets. The target assembly is slideable relative to the probe guide so that a first calibration target is aligned under the optical probe in a first position of the target assembly and a second calibration target is aligned under the optical probe in a second position of the target assembly.

A medical system includes a probe, an electro-optical measurement unit, and a processor. The probe is configured for insertion into a blood vessel of a brain, and includes two optical fibers, which include each an optical diffuser at distal ends thereof. One fiber is configured to guide an optical signal to a location along the blood vessel and to diffuse the optical signal so as to interact with a brain clot in the blood vessel. The other fiber is configured to collect the diffused optical signal that interacted with the brain clot at another location along the blood vessel. The electro-optical measurement unit is configured to transmit the optical signal to one optical fiber, and to receive and measure the diffused optical signal from the other optical fiber. The processor is configured to identify a composition of the brain clot by analyzing the measured diffused optical signal.

An all-purpose device capable of in vitro spectral analysis of sunscreen compositions as well as diffuse reflectance spectroscopy (DRS) capabilities on human skin includes a fiber optic guide, a light source positioned at one end of the fiber optic guide, and a sunscreen substrate assembly positioned at another end of the fiber optic guide.

An optical receiver is provided that includes an array of photoreceivers. Each photoreceiver may be configured to receive a respective portion of a speckle pattern generated by interaction between an object beam and a scattering medium and each photoreceiver may be configured to generate respective electrical detection signals for provision to processing circuitry for summing of the electrical detection signals. A photoreceiver may include a collector, first detector and second detectors, and first and second optical splitters. The photoreceiver may be configured to generate a first electrical detection signal and a second electrical detection signal based on a received portion of the speckle pattern.

A method for determining a characteristic of a direct-gap semiconductor comprises measuring at least one optical constant of a first sample of a direct-gap semiconductor with an optical spectrometer, calculating an estimated value of an optical parameter of the first sample of the direct-gap semiconductor based on fitting the model .sub.g(ln(1+e.sup.(h-E.sup.g.sup.)/(pE.sup.u.sup.))/ln(2)).sup.p to an optical absorption curve based on the at least one optical constant, obtaining at least one second value of the optical parameter, and calculating an estimated characteristic of the direct-gap semiconductor from the estimated value of the optical parameter and the obtained second value of the optical parameter. A method for determining a temperature of a direct-gap semiconductor and a system for determining a characteristic of a direct-gap semiconductor are also disclosed.

A flow cell for a colour measurement system is described that includes a body with a fluid inlet and a fluid outlet linked by a fluid pathway. An entrance window for allowing light transmission into the flow cell is provided, along with a coupler configured to couple a light source to the flow cell. The entrance window is fixedly coupled to the body of the flow cell, and the coupler is carried by a coupler mount that attaches to the body of the flow cell independently of the entrance window.

An all-purpose device capable of in vitro spectral analysis of sunscreen compositions as well as diffuse reflectance spectroscopy (DRS) capabilities on human skin includes a fiber optic guide, a light source positioned at one end of the fiber optic guide, and a sunscreen substrate assembly positioned at another end of the fiber optic guide.

Embodiments of the invention generally relate to color and appearance metric measurements and, in particular, developing instrumentation to enable self-consistent image appearance measurements within instruments of unitary construction.