A spectroscopic measurement apparatus includes a light source, an integrator, a spectroscopic detector, and an analysis unit. The integrator includes an internal space in which a measurement object is disposed, a light input portion for inputting light to the internal space, a light output portion for outputting light from the internal space, a sample attachment portion for attaching the measurement object, and a filter attachment portion for attaching a filter unit. The filter unit has a transmission spectrum in which an attenuation rate for excitation light is larger than an attenuation rate for up-conversion light, and attenuates the light output from the light output portion. The analysis unit analyzes luminous efficiency of the measurement object on the basis of the transmission spectrum data and the spectroscopic spectrum data acquired by the spectroscopic detector.

Manifestation of some physiological responses (e.g., stress, mental workload, or a headache) may involve the emergence of asymmetric thermal patterns on the face. Thus, thermal measurements of the face that are indicative of thermal asymmetry can be useful to detect such physiological responses. In one embodiment, a system includes first and second inward-facing head-mounted thermal cameras (CAM1 and CAM2, respectively) that are located less than 15 cm from the user's face, which take thermal measurements of regions on the right and left sides of the face (TH.sub.ROI1 and TH.sub.ROI2, respectively) of the user. The symmetric overlapping between the regions on the right and left sides (ROI.sub.1 and ROI.sub.2, respectively) is above 60%, and CAM1 and CAM2 do not occlude ROI.sub.1 and ROI.sub.2. Optionally, the system includes a computer that detects a physiological response based on thermal asymmetry between TH.sub.ROI1 and TH.sub.ROI2.

A spectroscopic measurement apparatus includes a light source, an integrator, a first spectroscopic detector, a second spectroscopic detector, and an analysis unit. The integrator includes an internal space in which a measurement object is disposed, a light input portion for inputting light to the internal space, a light output portion for outputting light from the internal space, and a sample attachment portion for attaching the measurement object. The first spectroscopic detector receives the light output from the integrator, disperses the light of a first wavelength region, and acquires first spectrum data. The second spectroscopic detector receives the light output from the integrator, disperses the light of a second wavelength region, and acquires second spectrum data. The first wavelength region and the second wavelength region include a wavelength region partially overlapping each other.

Manifestation of some physiological responses (e.g., stress, mental workload, or a headache) may involve the emergence of asymmetric thermal patterns on the face. Thus, thermal measurements of the face that are indicative of thermal asymmetry can be useful to detect such physiological responses. In one embodiment, a system includes first and second inward-facing head-mounted thermal cameras (CAM1 and CAM2, respectively) that are located less than 15 cm from the user's face, which take thermal measurements of regions on the right and left sides of the face (TH.sub.ROI1 and TH.sub.ROI2, respectively) of the user. The symmetric overlapping between the regions on the right and left sides (ROI.sub.1 and ROI.sub.2, respectively) is above 60%, and CAM1 and CAM2 do not occlude ROI.sub.1 and ROI.sub.2. Optionally, the system includes a computer that detects a physiological response based on thermal asymmetry between TH.sub.ROI1 and TH.sub.ROI2.

Systems and methods for measuring spectra and other optical characteristics such as colors, translucence, gloss, and other characteristics of objects and materials such as skin. Instruments and methods for measuring spectra and other optical characteristics of skin or other translucent or opaque objects utilize an abridged spectrophotometer and improved calibration/normalization methods. Improved linearization methods also are provided, as are improved classifier-based algorithms. User control is provided via a graphical user interface. Product or product formulations to match the measured skin or other object or to transform the skin or other object are provided to lighten, darken, make more uniform and the like.

A system for measuring a sample comprising: an integrating sphere light collector (12) for collecting light and containing the sample; a light source (24) for introducing light in the integrating sphere light collector (12), wherein the light source (24) is operable to output light with a known modulation, preferably by using a signal generator (26); a detector (22) for detecting scattered light in the integrating sphere light collector (12) and generating a signal indicative of the scattered light, and a lock-in amplifier (28) operable use the known light modulation and the signal generated by the detector (22) to provide an output for analysis.

In accordance with a broad aspect of the present invention the system and method described are directed to correcting with a single reference channel thermally dependent spectrum shifts of a light source used with a spectrophotometer. In one embodiment of the system and method described, a light measuring device uses the measured light intensity values to generate a correction coefficient for use in correcting measured light from an object under analysis.

An optical measurement device inputs excitation light to an integrating sphere in which a sample is disposed, irradiates the sample with the excitation light having a predetermined beam cross-section, detects measurement light output from the integrating sphere by a photodetector, and acquires intensity data of the sample. The optical measurement device includes a storage unit in which correction data is stored and an optical characteristic calculation unit for calculating optical characteristics of the sample based on the intensity data of the sample and the correction data. The correction data is calculated based on first corrective intensity data and second corrective intensity data. The predetermined beam cross-section is covered with the first light absorbing member and covers the second light absorbing member.

Apparatus for measuring spectral reflectance of a surface, the apparatus comprising: a chamber comprising a wall formed having an aperture defined by an aperture boundary; a light source mounted to the chamber and having a field of illumination (FOI) configured to intersect the aperture at an illumination intersection; and an optical fiber mounted to the chamber and having a field of view (FOV) configured to intersect the aperture at an imaging intersection; wherein the chamber is configured so that when the aperture is positioned on a surface the chamber substantially prevents light from entering a volume of the chamber.

A light measuring system including an integrating sphere having an aperture configured by opposing reflectors selectively aligned with complementary reflectors of at least one light source mounting block having a light source mounting region for mounting a light source thereon.