The present invention relates to an optical flow cell (1) for a measuring device, having an input light guide with a light exit surface, an output light guide with a light entrance surface, said input light guide and output light guide being integrated with a holder (30) to form optical flow cell (1), and wherein the holder (30) extends along a first axis (A) and has a through hole (31) for receiving a flow of a sample fluid, said through hole (31) being transversal to said first axis (A), and the input light guide and output light guide further are arranged in said holder (30) so that the light exit surface and the light entrance surface extend into said through hole (31) and are arranged to be in optical alignment with each other and at a first distance from each other. The invention also relates to a measuring device having at least one optical flow cell (1).

An optical nitrate sensor features a signal processor or signal processing module configured to: receive signaling containing information about a measurement (M) of UV optical absorbance of nitrate dissolved in water of a UV light that is generated by a UV LED centered at 229 nm and that traverses a confined volume of the water within a prescribed region of a sensor body, and also about a reference sample (R) of a portion of the UV light not traversing the confined volume of the water; and determine corresponding signaling containing information about the concentration of nitrate dissolved in the water, based upon the signaling received.

To provide a reflected light measurement device capable of efficiently performing disconnection inspection on an optical connector, and a plurality of optical fibers. The reflected light measurement device 1 includes a laser light source 2, a beam splitter 3 that branches measurement laser light L into measurement laser light L1 to be transmitted and reference laser light L2 to be reflected, a reference mirror 4 including an optical path length varying mechanism capable of adjusting an optical path length of the reference laser light L2, an optical path length switching unit 5, and switches the optical path length of the reference laser light L2 to a plurality of fixed lengths, and a photometer 6 that receives measurement laser light L1′ reflected at defect sites D1 and D2 such as disconnection inside connectors C1 and C2, and reference laser light L2′ reflected by the reference mirror 4.

The present invention relates to an apparatus for measuring the absorbance of a substance in a solution, comprising at least one sample cell arranged to contain said solution that is at least partially transparent to light of a predefined wavelength spectrum, at least two light passages through said at least one sample cell, each of said light passages having a known path length, an LED light source arrangement comprising at least two LEDs, each arranged to emit a light output with a wavelength within said predefined wavelength spectrum, wherein a plurality of optical fibers, one for each light passage, is arranged at each LED for receiving said light output and guiding it to the light passages. The invention also relates to a method for measuring the absorbance of a substance in a solution.

A gas analyzer for measuring two gas components of a measuring gas includes two light-emitting diodes, a beam splitter, a measuring chamber through which the measuring gas circulates, a measurement detector, a reference detector, and a control and evaluation device for controlling the light-emitting diodes in an alternating manner and for evaluating the signals supplied by the measurement detector and the reference detector in terms of measuring results for the two gas components, wherein the beam splitter is arranged in a rectangular metal block, where the measuring chamber is formed as a long hollow body consisting of metal and open on both sides, the measurement detector is held on a detector block consisting of metal, and where the rectangular metal block and the detector block are interconnected via tension rods between which the measuring chamber is clamped.

The present invention relates generally to a slope spectroscopy standards and methods of making slope spectroscopy standards, specifically standards and methods of developing standards specifically for variable pathlength (slope) measurements.

A chamberless indoor air quality monitor system includes a detector body. A resistive heater is operatively connected to the detector body. An active temperature sensor operatively connected to the resistive heater and operatively connected to an outer surface of the detector body configured to take an active temperature measurement. A method for measuring temperature in a chamberless indoor air quality monitor system includes generating an active temperature measurement with an active temperature sensor operatively connected to an outer surface of the detector body. The method includes heating the active temperature sensor with a resistive heater operatively connected to the detector body. The method includes comparing the active temperature measurements to one another to generate a corrected active temperature measurement based on a temperature difference over time between one or more of the active temperature measurements.

An analysis system is provided which enables an optical analysis with high accuracy. An analysis system A in which light is radiated on a liquid sample to analyze the sample includes a reaction part 1 which includes a reaction tank 12, an inlet port 14, and an outlet port 16, an analysis part 2 which includes an analysis cell 22a, at least one light source part 24, and at least one light receiving part 26, and a flow path tube 3 which includes a first flow path 32 and a second flow path 34. A measurement part 222 of the analysis cell 22a includes a first measurement portion 2221 and a second measurement portion 2222, which have mutually different sectional areas.

A gas concentration measurement device is disclosed. The gas concentration measurement device comprises: a light source unit for emitting light into the gas concentration measurement device; an incident unit for refracting the light emitted from the light source unit; a first reflection unit and a second reflection unit for reflecting the incident light; a rotatable third reflection unit; and a light receiving unit for measuring the amount of incident light, wherein the light incident from the incident unit is reflected between the first reflection unit and the second reflection unit through the third reflection unit, and the light is incident on the light receiving unit by allowing an optical path thereof to be changed according to the rotation of the third reflection unit.

A gas analyzer for measuring two gas components of a measuring gas includes two light-emitting diodes, a beam splitter, a measuring chamber through which the measuring gas circulates, a measurement detector, a reference detector, and a control and evaluation device for controlling the light-emitting diodes in an alternating manner and for evaluating the signals supplied by the measurement detector and the reference detector in terms of measuring results for the two gas components, wherein the beam splitter is arranged in a rectangular metal block, where the measuring chamber is formed as a long hollow body consisting of metal and open on both sides, the measurement detector is held on a detector block consisting of metal, and where the rectangular metal block and the detector block are interconnected via tension rods between which the measuring chamber is clamped.