A measurement system for measuring blood characteristics includes a controller, an emitter, a sensor, and a reference sensor. The emitter emits light at a plurality of wavelengths from a first side of a blood flow channel to a second side of the blood flow channel. The sensor is provided on the second side of the blood flow channel. The reference sensor is provided on the first side of the blood flow channel. The controller compensates measurements from the sensor based upon measurements from the reference sensor. The reference sensor may be disposed in a position to increase noise immunity of the measurement system. The measurement system may be connected to or part of a dialysis system.

A flow cell system for an optical fluid analysis comprises a disposable flow cell having at least one flow chamber comprising a fluid pathway, and at least one pair of opposed light transmitting windows along the fluid pathway, an external flow cell holder for holding the flow cell, at least one light source, and an external detection device couplable with at least one of the flow cell holder and the flow cell for bringing the external detection device in optical communication with the flow cell, the device having at least one optical detection unit. The external detection device is configured to conduct optical measurements of the fluid that flows in the flow cell through at least one pair of windows from externally under illumination by the at least one light source.

The present disclosure, among other things, describes a reader system comprising a casing, an optical system, an electromechanical motor system, and one or more digital processors.

An optical rain sensor device includes a first light emitting element adapted to emit a first light pulse toward an inner surface of a transparent substrate, a second light emitting element adapted to emit a second light pulse toward the inner surface of the transparent substrate, a photodetector adapted to detect a light from the first light pulse and the second light pulse that is reflected by the inner surface of the transparent substrate, and a rain sensor controller. The rain sensor controller includes a regulated current source adapted to apply a compensation current signal at a terminal of the second light emitting element based on a regulation signal, so that a total current across the second light emitting element is increased or decreased to reduce an imbalance between the first light pulse and the second light pulse.

Provided is a sensor system having an improved SNR. The sensor system (1) includes: a sensor (gas sensor 10) including a light-emitting element (11) and a detecting element (light-receiving element 12) that detects a signal that is based on light emitted from the light-emitting element; and a computation device (20) that, by taking an interval in which the light-emitting element emits light as an ON interval and an interval in which the light-emitting element does not emit light as an OFF interval, uses the signal as detected in the ON interval and the signal as detected in a plurality of the OFF interval to compute one measurement value.

Disclosed is a method for measuring the absorbance of light of a substance in a solution in a measuring cell (23; 223′), said method comprising the steps of: transmitting (S1) a first light beam (27; 27′) from a light source (25; 25′) towards a beam splitter (29; 29′); dividing (S3) the first light beam (27; 27′) into a signal light ray (31; 31′) and a reference light ray (33; 33′) by the beam splitter (29; 29′); modulating (S5) the signal light ray (31; 31′); modulating the reference light ray (33; 33′); providing (S9) the measuring cell (23; 23′) such that the signal light ray (31; 31′) passes through the measuring cell; detecting (S11) a signal in a detector (39; 39′), which signal is the combined signal intensity of the signal light ray (31; 31′) and the reference light ray (33; 33′) detected by the detector (39; 39′); performing synchronous detection (S15) of the detected signal in order to reconstruct the intensities of the signal light ray (31; 31′) and the reference light ray (33; 33′) from the combined signal detected by the detector (39; 39′), said synchronous detection being based on the modulation performed to the signal light ray and the reference light ray. Disclosed also is a measuring device for carrying out said method.

A reflectometer and method of use for measuring an amount of analyte in a sample are provided. The reflectometer can include a plurality of reading heads for obtaining reflectance information from discrete regions on a lateral flow test strip. The reflectance information is processed to obtain a digital value for the reflectance. The discrete regions can include a test zone and at least two control zones that each has a differing amount of detection moiety binding substance. The digital values for each control zone can be employed to establish a high end standard and a low end standard. The digital value for the test zone interpolated to the standards to obtain an accurate quantitative value for the analyte in the sample.

The present invention relates to testing biological or industrial samples. Disclosed by preferred embodiments is an electronic assay test reader for reading a lateral flow test strip having a development area comprising a test background region and at least one test result line, the electronic lateral flow assay test reader comprising: a cassette for retaining the test strip and a carrier adapted to removably retain the cassette therein; at least one illumination LED operably associated with one or a combination of the cassette and the carrier for illuminating the test strip, and; a light guide comprising a window structure of one or a combination of the cassette and the carrier to direct light emitted or reflected from a selected portion of the development area of the test strip to a sensor wherein the proportion of the at least one test result line relative to the proportion of test background region in the selected portion of the development area of the test strip is maximised

A device for emitting electromagnetic radiation, in particular UV radiation, including at least one radiating unit that only emits radiation at visible wavelengths. The device further includes a unit for detecting a functional error of the radiating unit. In practice, the radiating unit is provided for emitting only UV radiation and/or IR radiation and is formed by a light diode. The detection unit is designed to continuously monitor the radiating unit for functional errors, and the device includes an open-loop and/or closed-loop control unit which is provided to automatically switch off the radiating unit and/or display the functional error, upon detection of the functional error by the detection unit.

System and apparatus for portable gas detection. Specifically, this disclosure describes apparatuses and systems for optical gas detection in a compact package. There is a need for a very compact, low-power, gas detection system for gases such as CO2, NOx, water vapor, methane etc. This disclosure provides an ultra-compact and highly efficient optical measurement system based on principals of optical absorption spectroscopy. It reduces the size of the instrument as well its power consumption by more than an order of magnitude making it possible to deploy it widely. There is an identified need for large number of distributed gas sensors to improve human health, environment, and save energy usage.