Abstract:
Method and apparatus for external cavity laser absorption spectroscopy There is disclosed an apparatus, and corresponding methods, for determining one or more characteristics of a sample in an absorption cell using laser absorption spectroscopy. For example, the characteristic may be concentration of a species in the sample. The apparatus comprises an external cavity semiconductor laser comprising a semiconductor gain medium within an optical resonator. The absorption cell is located within the optical resonator of the external cavity semiconductor laser so as to be optically coupled with the gain medium. A controller is arranged to provide a varied injection current to the semiconductor gain medium. A photodetector is arranged to detect laser light output by the external cavity semiconductor laser. An analyzer is arranged to determine one or more characteristics of the sample from behavior of the detected laser light output as a function of the varied injection current.
Abstract:
An optical gas sensing apparatus includes an explosion-rated device electronics enclosure. An explosion-rated sensing enclosure has a light transmitting element to allow light to pass out of and into the sensing enclosure. The sensing enclosure is operably coupled to the explosion-rated device electronics enclosure by a feed-through. In one aspect, an internal volume of the sensing enclosure is less than or equal to about one fiftieth of the volume of the explosion-rated device electronics enclosure. In another aspect, the thickness of the light transmitting element is less than or equal to about 3 millimeters. A light source is disposed within the sensing enclosure and is operably coupled to the device electronics. A detector is disposed within the sensing enclosure and is also operably coupled to the device electronics.
Abstract:
An object of the present invention is to provide a grain transilluminating device capable of detecting all of the cracks whose orientations are variously different depending on grains without causing a sample dish to be rotated. According to the present invention, there is provided a grain transilluminating device causing light to enter a transparent bottom face of a sample dish obliquely from a downside, the device including: a base member; a rotary member rotatably disposed in the base member and having a light source on one lateral side, and provided with a reflective plate reflecting the light from the light source toward the bottom face of the sample dish; and a cover member attached onto the base member to constitute, along with the base member, an outer frame and having an opening part positioned above the rotary member to receive the sample dish, wherein an operating part for rotating operation on the rotary member is provided in the rotary member and an opening is formed in the outer frame, and the operating part is configured to extend outside from the outer frame through the opening and to be swingable with a center of the rotary member being an axis.
Abstract:
The invention relates to a receptacle (4) for receiving a sample (5) during an optical analysis of the sample (5), wherein the receptacle (4) comprises a bottom (19) which is at least partially transparent so that the sample (5) within the receptacle (4) can be optically analyzed by an image sensor (6) from below the bottom (19) and wherein the bottom (19) is very thin thereby improving contrast and sharpness of the images generated by the image sensor (6). Further, the invention relates to a system for optically analyzing a sample (5).
Abstract:
A container for optical measurement includes: a container main body including a tubular-shaped side wall part having one end blocked with a bottom-face part and having the other end that is open, the side wall part being made up of a single member; and a filter that is fixed to an inner face of the side wall part so as to divide a space in the side wall part into a side on the bottom-face part side and on a side of the other end that is open. At least part of the container main body facing the space on the side of the bottom-face part is made of a material letting light pass therethrough.
Abstract:
Microplate reader has a housing, at least one optical measuring/detection device, a microplate support, a moving unit and an integrated lid holding apparatus. The lid holding apparatus moves the microplate in one respective, at least approximately vertical direction for moving the microplate lid away from the microplate. The lid holding apparatus is arranged inside the housing as a magnetic lifter and comprises a non-array arrangement of at least one permanent magnet, or at least three electro magnets, or at least one switchable permanent magnet. Each microplate lid to be moved away from the microplate comprises magnetizable material with a physical area. A projected area of the at least one permanent magnet, electro magnet, or switchable permanent magnet is smaller than the physical area of the magnetizable material of the microplate lid.
Abstract:
A portable, tabletop fluid sampling device simplifies spectral analysis to produce an accurate but inexpensive chromatic fingerprint for fluid samples. In one embodiment, the sampling device uses an array of variable wavelength LED emitters and photodiode detectors to measure Rayleigh scattering of electromagnetic energy from the fluid sample contained in a cuvette. Either the fluid itself, or particles suspended in the fluid can then be identified by performing spectral pattern matching to compare results of a spectral scan against a library of known spectra. A wide range of applications include substance identification, security screening, authentication, quality control, and medical diagnostics.
Abstract:
An infrared detector includes a detecting element, a first electrode and a second electrode. The detecting element includes an absorbing part and a non-absorbing part. A first end is located in the absorbing part. A second end is located in the non-absorbing part. An angle between the absorbing part and the non-absorbing part is less than 90 degrees. A first electrode is electrically connected with the first end. A second electrode is electrically connected with the second end.
Abstract:
A portable, tabletop fluid sampling device simplifies spectral analysis to produce an accurate but inexpensive chromatic fingerprint for fluid samples. In one embodiment, the sampling device uses an array of variable wavelength LED emitters and photodiode detectors to measure Rayleigh scattering of electromagnetic energy from the fluid sample contained in a cuvette. Either the fluid itself, or particles suspended in the fluid can then be identified by performing spectral pattern matching to compare results of a spectral scan against a library of known spectra. A wide range of applications include substance identification, security screening, authentication, quality control, and medical diagnostics.
Abstract:
A surface chemistry measuring apparatus includes a processor, an array of tunable infrared laser spectrometers interfacing with the processor and configured for simultaneous measurement of surface chemistry across a surface to be measured using a range of infrared wavelengths and a display interfacing with the processor and adapted to display IR spectra of infrared wavelengths reflected from the surface to be measured.