A heating device includes a combustion chamber, a housing in fluid communication with the combustion chamber, a burner disposed in the housing, a blower assembly connected to the housing for directing air into the interior of the housing, a valve assembly connected to the housing for controlling a flow of fuel into the burner, an optical color sensor for sensing a color profile of a surface of the burner, and a control unit configured to control the valve assembly in dependence upon the color profile of the surface of the burner.

Techniques, devices and methods for discriminating a target from a background material without optimizing directly on the target are provided. The devices and methods can generate pass bands of single or multiple wavelengths of variable shape and intensity, and can also select and control the shape of the pass band profiles to improve the detection of targets of interest.

The invention relates to a portable device for estimating at least one parameter characteristic of a polymer material, characterized in that the device comprises at least one infrared source, each infrared source being capable of emitting towards the polymer material a spectral line, representing maximum emission energy, selected in one of the wavelengths 10 μm, 9.5 μm, 7.2 μm, 6 μm, 3.5 μm, 2.7 μm or in one of the wave numbers 1,000 cm.sup.−1, 1,050 cm.sup.−1, 1,350 cm.sup.−1, 1,700 cm.sup.−1, 2,900 cm.sup.−1, 3,700 cm.sup.−1, at least one infrared detector, capable of receiving infrared radiation, which is reflected by the polymer material in response to the spectral line, a unit for determining the parameter characteristic of the polymer material as a function of the energy present in said spectral line in the infrared radiation, having been reflected by the polymer material and having been received by the infrared detector.

Disclosed are methods of fabricating an integrated computational element for use in an optical computing device. One method includes providing a substrate that has a first surface and a second surface substantially opposite the first surface, depositing multiple optical thin films on the first and second surfaces of the substrate via a thin film deposition process, and thereby generating a multilayer film stack device, cleaving the substrate to produce at least two optical thin film stacks, and securing one or more of the at least two optical thin film stacks to a secondary optical element for use as an integrated computational element (ICE).

A method, device and a system of determining a concentration of one or more analytes in a sample is disclosed. In one aspect of the invention, the method includes introducing the sample through a channel The method further includes illuminating the sample with light having varying wavelengths. Additionally, the method includes obtaining an image of the illuminated sample at each of the wavelength. Furthermore, the method includes analyzing the image to determine the concentration of the one or more analytes.

Techniques, devices and methods for discriminating a target from a background material without optimizing directly on the target are provided. The devices and methods can generate pass bands of single or multiple wavelengths of variable shape and intensity, and can also select and control the shape of the pass band profiles to improve the detection of targets of interest.

The absorbance of a mixed sample at multiple wavelengths is determined and the concentrations of the sample constituents deduced from the observed absorbances. Assuming the sample constituents are known, these wavelengths correspond to peak absorption wavelengths for the constituents. Rather than attempt to generate an analytical relationship among absorbance levels and constituent concentrations, a database of absorbance values for each wavelength, spanning the range of possible analyte concentrations, is employed instead. In general, the wavelengths utilized correspond to peak absorption wavelengths for each of the analytes.

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 concentration measurement device for measuring the concentration of a measured fluid within a measurement cell by detecting transmitted light that has passed through the measurement cell having a light incidence window and a light emission window disposed opposing to each other, comprising a reflected-light detector for detecting reflected light of the light incidence window.

The present disclosure relates to a method for measuring fibrinogen concentration in a blood sample, which enables measuring of the concentration of the fibrinogen protein present in a blood sample from the human body. The method for measuring fibrinogen concentration of the present disclosure is convenient because an enzyme is not used. In addition, an error due to a factor affecting factor affecting in-vivo enzyme activity does not occur and measuring time is decreased since measurement for reference plasma is unnecessary. Therefore, the method achieves superior accuracy, precision and reproducibility as compared to the existing technologies and can be usefully employed for measuring fibrinogen concentration in a blood sample.