A device comprising an imaging unit for capturing an image of a target object and of an accessory. The accessory comprises a reference target object having a known retroreflective coefficient. The device also comprises a calculating unit for calculating a value of a retroreflective coefficient of the target object based on a comparison of the image of the target to the image of the accessory.

Embodiments described herein may be useful in the detection of analytes. The systems and methods may allow for a relatively simple and rapid way for detecting analytes such as chemical and/or biological analytes and may be useful in numerous applications including sensing, food manufacturing, medical diagnostics, performance materials, dynamic lenses, water monitoring, environmental monitoring, detection of proteins, detection of DNA, among other applications.

A retroreflective optical system for creating a passive optical tag in an absence of electrical power, involving: a retroreflector having a surface and a retroreflective element disposed in relation to the surface, the retroreflective element configured to: passively impart a unique signature in relation to incoming light by using at least one of spectral filtration and color filtration, whereby a plasmonic response is effectible; and reflect outgoing light having the unique signature; and an optical device having an input aperture, the optical device disposed at a distance from the retroreflector and configured to transmit the incoming light and the outgoing light.

Problem: To provide a device, system, method, and program able to easily measure retroreflective coefficients using a commercially available mobile terminal having an imaging unit. Resolution Means: A device is provided that has an imaging unit for capturing an image of a target object, an observation angle acquiring unit for acquiring an observation angle determined by a positional relationship between the imaging unit, a light source for emitting light for capture and the target object, an entrance angle acquiring unit for acquiring an entrance angle of light emitted for capture incident on the target object, a converting unit for converting image data of an image to a luminance value of the target object using capture information of the image, and a calculating unit for calculating a value of a retroreflective coefficient of the target object based on an illuminance value and the luminance value of the target object.

A retroreflectivity measurement system comprises a light source arranged to project light across a traffic lane during a measurement run, the light being limited to a particular portion of the visible light spectrum. A camera is selectively sensitive to this light to provide first filtered images and separately selectively sensitive to light at a portion of the spectrum not including the particular portion to provide second filtered images. A controller obtains sequences of first and second filtered images during the measurement run, and identifies within the sequences of images an illuminated road marking; determines a first intensity of the marking from a first filtered image, and a further intensity of the marking from the second filtered images; estimates an ambient intensity of the marking, by applying a scaling factor to the further intensity; and determines a retroreflectivity of the marking as a function of the first and estimated ambient intensities.

A detection device including: a holding block that holds a transparent tubular body having a curved surface shape; an accommodating hole that is formed in the holding block and in which the tubular body is inserted and accommodated; an optical sensor that includes a light projecting unit which emits detection light for detecting whether or not the tubular body is accommodated in the accommodating hole and a light receiving unit which receives the detection light; and an optical path of the detection light that has a tunnel structure covered with a wall surface, the optical path linearly extending inside the holding block in a direction intersecting with the accommodating hole and being formed at a position away from a radial center of the accommodating hole, in which a wall surface of the accommodating hole and a wall surface of the optical path have a light reflectivity of 30% or less.

An optical gene biosensor is disclosed. The optical gene biosensor includes a substrate; a molecular beacon anchored to the substrate, wherein the molecular beacon includes an oligonucleotide specifically binding to a target nucleic acid molecule and a first compound bound to a first terminal of the oligonucleotide; an optical marker specifically binding to the first compound, wherein the optical marker is configured to retro-reflect irradiated light; a light source for irradiating the optical marker with light; and a light-receiver for receiving light retro-reflected from the optical marker. The optical gene biosensor may perform accurate quantitative analysis of a target nucleic acid molecule using both non-spectral and spectral light sources.

A filter-press filter-cloth damage detection device for a filter press includes a detection path and a detection device. In the filter press, a filtrate produced by solid-liquid separation operation of a filter cloth nipped between filter plates is discharged into a collection pipe via a filtrate passage of each of the filter plates. The detection path extends in a straight line. A filtrate discharged from each of filtration chambers formed between adjacent filter plates is collected to the detection path. The detection device is configured to transmit, from an end portion of the detection path, an irradiation wave or a pulse that reflects on an interface between a clear filtrate and a filtrate with a prescribed turbidity, convert a propagation time from the transmission until reception of a reflected wave into a distance, and output the distance.

A growth-rate measuring apparatus has a refractometer to irradiate light of a plurality of different wavelengths to a surface of a substrate to measure a reflectivity of the surface of the substrate per different wavelengths, a fitter to fit a reflectivity calculated by a model function, the model function being obtained in advance, to a measured value of the reflectivity, for at least one layer of thin films laminated one by one on the substrate, with at least one of a refractive index and a growth rate as a fitting parameter, a parameter extractor to extract sets of fitting parameters for each wavelength in the different wavelengths, respectively, for which an error between the calculated reflectivity and the measured value of the reflectivity is minimum, and a parameter selector to select an optimum set of values of the fitting parameter, among the fitting parameters extracted for the different wavelengths.

Problem: To provide a device, system, method, and program able to easily measure retroreflective coefficients using a commercially available mobile terminal having an imaging unit. Resolution Means: A device is provided that has an imaging unit for capturing an image of a target object, an observation angle acquiring unit for acquiring an observation angle determined by a positional relationship between the imaging unit, a light source for emitting light for capture and the target object, an entrance angle acquiring unit for acquiring an entrance angle of light emitted for capture incident on the target object, a converting unit for converting image data of an image to a luminance value of the target object using capture information of the image, and a calculating unit for calculating a value of a retroreflective coefficient of the target object based on an illuminance value and the luminance value of the target object.