An arrangement for measuring gas concentrations in a gas absorption method, wherein the arrangement includes a plurality of light sources, a measuring cell, at least one measuring receiver and an evaluation apparatus. The measuring cell has a narrow, longitudinally-extended beam path with an entrance-side opening diameter B and an absorption length L with L>B, wherein the measuring cell has a gas inlet and a gas outlet wherein a plurality of light sources of different wavelength spectra is grouped into a first light source group wherein an optical homogeniser is interposed between the first light source group and the measuring cell, wherein, in particular, the homogeniser is coupled to the light source group directly or via a common optical assembly.

Methods for detecting an amount of a rust removing agent in a sample are disclosed, the methods using a colored reagent complex formed from a reaction of a transition metal salt and a salicylate salt or acid, or a derivative thereof. A method includes making a test sample solution comprising the sample and the colored reagent complex, evaluating the visible color and/or absorption value of the test sample solution, and comparing the visible color and/or absorption value of the test sample solution to the visible color and/or absorption value of a reference solution containing a known amount of rust removing agent.

A dryness detection method of detecting dryness of a liquid resin composition containing a solvent. The dryness detection method includes a wavelength selection step of selecting a light absorption wavelength of the solvent, a light source selection step of selecting a light source that emits light including light of the selected wavelength, a light receiving step of applying the light that has been emitted from the light source to the liquid resin composition, and receiving light that has passed through the liquid resin composition, and a determination step of finding whether or not the light of the selected wavelength after absorption in the solvent in the light receiving step exceeds in quantity a predetermined threshold, and if the threshold is found to be exceeded, determining that the solvent has evaporated and the liquid resin composition has dried. A dryness determination apparatus is also disclosed.

A method of detecting an amine-based shale inhibitor in a wellbore servicing fluid (WSF) comprising contacting an aliquot of the WSF with an amine detector compound to form a detection solution; wherein the WSF comprises the amine-based shale inhibitor; and wherein the detection solution is characterized by at least one absorption peak wavelength in the range of from about 380 nm to about 760 nm; detecting an absorption intensity for the detection solution at a wavelength within about ±20% of the at least one absorption peak wavelength; comparing the absorption intensity of the detection solution at the wavelength within about ±20% of the at least one absorption peak wavelength with a target absorption intensity of the amine-based shale inhibitor to determine the amount of amine-based shale inhibitor in the WSF; and comparing the amount of amine-based shale inhibitor in the WSF with a target amount of the amine-based shale inhibitor.

The aim of the invention is to provide a method for estimating a spectral reflectance value to be expected of a layer system consisting of a layer sequence of materials and printing inks that involves reliably predicting the appearance of the desired print. This aim is achieved according to the invention by providing a method for estimating a spectral reflectance value to be expected of a layer system consisting of a layer sequence of materials and printing inks, in which: a) firstly the values are determined for each individual layer in relation to i) the spectral transmission at the interfaces of the layer, ii) the spectral reflectance at the interfaces of the layer, iii) the spectral absorption in the layer volume, and iv) the spectral scattering in the layer volume; b) a resulting reflectance value is ascertained from the determined values in relation to the layer sequence by following the various light paths in a sequential course through the layers.

A spectroscopic measurement device emits light to a measurement target and measures the measurement light output from the measurement target in accordance with the light emission. A spectroscopic measurement device includes: a first housing having a light shielding property and configured to house a light source that emits light and having a first opening through which the light emitted from the light source passes; a second housing having a light shielding property and having a second opening through which the measurement light passes and configured to house a spectrometer that receives the measurement light that has passed through the second opening; and an attachment configured to detachably hold the first housing and the second housing.

A spectroscopic measurement device emits light to a measurement target and measures the measurement light output from the measurement target in accordance with the light emission. A spectroscopic measurement device includes: a first housing having a light shielding property and configured to house a light source that emits light and having a first opening through which the light emitted from the light source passes; a second housing having a light shielding property and having a second opening through which the measurement light passes and configured to house a spectrometer that receives the measurement light that has passed through the second opening; and an arm member configured to relatively rotatably join the first housing and the second housing. A proximal end side of the arm member is rotatably joined with the second housing. The first housing is attached to a distal end side of the arm member.

A method of detecting an amine-based shale inhibitor in a wellbore servicing fluid (WSF) comprising contacting an aliquot of the WSF with an amine detector compound to form a detection solution; wherein the WSF comprises the amine-based shale inhibitor; and wherein the detection solution is characterized by at least one absorption peak wavelength in the range of from about 380 nm to about 760 nm; detecting an absorption intensity for the detection solution at a wavelength within about +20% of the at least one absorption peak wavelength; comparing the absorption intensity of the detection solution at the wavelength within about +20% of the at least one absorption peak wavelength with a target absorption intensity of the amine-based shale inhibitor to determine the amount of amine-based shale inhibitor in the WSF; and comparing the amount of amine-based shale inhibitor in the WSF with a target amount of the amine-based shale inhibitor.

Cure monitoring systems for and methods of monitoring polymerizable material to determine the degree of curing of the polymerizable material. A monitoring light source delivers visible monitoring light at one or more different visible wavelengths and a visible light detector detects the monitoring light diffusely reflected by the polymerizable material. The monitoring light has a wavelength of maximum emission (max-mon) that does not effectively induce polymerization of the polymerizable material. Change in intensity of the monitoring light reflected from the polymerizable material is used to determine when a selected degree of curing is reached in the polymerizable material.

The present invention provides an optical method for predicting treatment response, survival and recurrence of esophageal cancer patients, comprising analyzing the spectral signatures of patient's tumor tissue spectra. By the features of the present invention, the prediction result achieves the sensitivity of 75% and specificity of 73.3% in concurrent chemoradiotherapy (CCRT) response; the survival prediction rate achieves the sensitivity of 100%; the recurrence prediction rate achieves the sensitivity of 85.7%.