An aspect of the invention provides a method for determining at least one internal quality attribute of an article (102) of agricultural produce. The method includes receiving a plurality of first spectroscopic values obtained from directing low band light in a first wavelength associated to a low band of wavelengths from at least one low band light source (104) at least partly through the article (102) toward at least one detector (120); receiving a plurality of second spectroscopic values obtained from directing high band light in a second wavelength associated to a high band of wavelengths from at least one high band light source (106) at least partly through the article (102) toward the at least one detector (120); determining at least one measured spatial profile associated to the article, the at least one measured spatial profile comprising at least one of a plurality of ratios of respective first spectroscopic values to respective second spectroscopic values, a plurality of ratios of respective second spectroscopic values to respective first spectroscopic values; and determining the at least one internal quality attribute at least partly from a comparison of the at least one measured spatial profile with at least one reference spatial profile associated to a class of articles of agricultural produce.

An optical spectral sensing device for determining at least one property of a fluid. The device has an elongated porous body, a first end and a second end, a solid-state optical emitter at the first end of the body oriented to emit radiation toward the second end of the body, and a solid-state optical detector at the second end of the body oriented to detect radiation emitted by the optical emitter and to output a signal responsive to absorption of radiation. The device is configured to determine depth of a fluid based on the signal output by the optical detector.

A method for automated identification of a state of a sample such as, for example, for identifying whether or not the sample was centrifuged is presented. A device for analyzing samples and a laboratory automation system are also presented in which the method is applied.

The invention provides an anti-biofouling system (200) comprising an UV-emitting element (210), wherein the UV-emitting element (210) comprises a UV radiation exit window (230), wherein the UV-emitting element (210) at least partly encloses a light source (220) configured to provide UV radiation (221), wherein the UV radiation exit window (230) is configured to transmit at least part of the UV radiation (221) of the light source (220), wherein the UV radiation exit window (230) comprises an upstream window side (231) and a downstream window side (232), wherein the UV-emitting element (210) also at least partly encloses an optical sensor (310) configured to sense radiation (421) emanating from the downstream window side (232) and configured to provide a corresponding optical sensor signal, wherein the anti-biofouling system (200) is further configured to provide said UV radiation (221) in dependence of said optical sensor signal.

The present disclosure generally relates to the field of blood glucose monitoring. A device for determining a blood glucose level includes a first light emitting unit configured to emit a first light; a second light emitting unit configured to emit a second light, wherein one of the first light and the second light is configured to be insensitive to glucose content in blood; a first light receiving unit configured to generate a first signal based on the first light; and a second light receiving unit configured to generate a second signal based on the second light.

A method and device for the optical scanning of a chromatographic sample (3), where a sample plate (2) holding the sample (3) is illuminated with light from a first illumination device (13) and the light emitted by the sample plate (2) is detected by an optical detector device (15) which detects in cell form or area form, a second illumination device (14) is preferably firstly activated in a preparation step. The sample plate (2) is displaced in a first displacement direction relative to the detector device (15), illuminated by the first illumination device (13) and a first measurement image is recorded. The sample plate (2) is displaced in a second displacement direction relative to the detector device (15), illuminated by the second illumination device (14), and a second measurement image is recorded.

A system, wearable device, and method include a light emitter configured to emit light at a first wavelength of between approximately 900 and 1000 nanometers and at a second wavelength of approximately 1350 nanometers, a first light detector spaced at a first distance from the light emitter, and a second light detector spaced at a second distance from the light emitter, the second distance approximately twice the first distance. At least one of hydration and glycogen of muscle tissue is determinable based on a relationship between backscatter light from the muscle tissue as detected by the second light detector and backscatter light from non-muscle tissue as detected by the first light detector.

A gas sensing system measures a concentration of first and second gasses in a gas sample disposed in a cavity containing a porous scattering material. The first and second gas each have an absorption peak at a different wavelength. First and second emitters emit light having a spectrum that includes one of the different wavelengths. A single sensor, or multiple sensors, detect at least some of the light emitted by the first and second emitters. A processor determines concentration of the first and second gases from signals from the sensor that indicate intensities of the light from the first and second emitters. When a single sensor is used, the first and second emitters are driven, and the sensor signal detected, at different times. When multiple sensors are used, the sensors detect signals at one of the absorption peaks.

A gas sensing system measures a concentration of a gas sample having an absorption peak at a first wavelength. An emitter emits light having a spectrum that includes at least the first wavelength. A sensor detects at least some of the light emitted by the emitter. A porous scattering material is substantially transparent at the first wavelength and scatters at least some of the light. A surface of the porous scattering material opposing the emitter and the sensor has a depression. The emitter and the sensor are laterally and vertically separated by a separator filling the depression. The separator specularly or diffusively reflects the light emitted by the emitter.

A moisture detecting apparatus includes: a light emitting unit including a first light source configured to emit light having a first wavelength as a peak wavelength, and a second light source configured to emit light having a second wavelength as a peak wavelength; a detecting unit configured to detect a first detection value indicating an extent to which the light emitted from the first light source is transmitted through a recording material, and a second detection value indicating an extent to which the light emitted by the second light source is transmitted through the recording material, based on a light receiving result of a light receiving unit; and a determination unit configured to determine a value related to a moisture content of the recording material based on the first detection value and the second detection value.