Abstract:
A spectrometer or multiple wavelength absorbance detection method and apparatus providing improved accuracy for an array of measurements at different wavelengths. The spectrometer utilizes a multiple wavelength illumination system with an array of independent detectors with different pathlength cells, where each cell is illuminated with predominately monochromatic light after separation by a light dispersing element. Each sample cell has an optical pathlength, optics and photodetection device that are optimized for its particular wavelength to accurately measure absorbance through an expected substance.
Abstract:
A spectrophotometric system includes a zoom lens assembly that is mounted for axial translation relative to an integrating sphere. The zoom lens assembly includes first and second focusing lens mounted to an axially movable lens carrier. The lens carrier is positioned intermediate first and second sets of mirrors for reflecting/directing SCE and SCI beams toward fiber ports. A reference beam is also emitted from the integrating sphere and transmitted to a processor, thereby resulting in simultaneous tri-beam measurements. The disclosed spectrophotometric systems may also include an aperture plate detection assembly and/or a sample holder assembly that incorporates a dampening gas spring. The aperture plate detection system includes a detection disk that may include a plurality of pre-positioned sensors that interact with an activating ridge formed on the aperture plate for identification thereof.
Abstract:
The invention concerns a miniaturized spectrometer, especially in the form of a probe, for determination of the ingredients of a gaseous or liquid fluid with a light source (3) and a spectrometer (2), at least one measurement beam and at least one reference beam. The invention is characterized by the fact that the light of the light source (3) is optionally fanned out and bundled by means of at least one optical lens (8) to an essentially parallel beam, that at least one measurement beam is passed through a light transparent window from the probe into the fluid being investigated and through an additional light transparent window back into the probe, that at least one reference beam is guided in the probe interior, that a collecting optics (14), consisting of at least one lens, diverts the beams to the impingement point of the light guide (5) or the inlet of the spectrometer (2), and that a beam selector (7) is provided in the region of the collecting optics (14) that passes through one of the partial beams and interrupts all the others.
Abstract:
There is provided an optical system for measurement of optical constant capable of measuring the absolute reflectance and the absolute transmittance for determining the optical constant of a substance with excellent accuracy without replacing the optical system during the measurement by using a different system for measuring the absolute reflectance and the absolute transmittance of the sample, comprising an incoming side beam switching mirror for selectively switching the direction of the light from a light source to a first or second converged light reflecting means side, first and second converged light reflecting means for projecting the light from the beam switching mirror so as to be converged in an intersecting manner at the position of a sample holder, the sample bolder capable of selectively positioning a sample fitting hole or a through hole at the converging position by the converged light reflecting means by advancing/retracting the sample fitting hole or the through hole, first and second received light reflecting means which are disposed on the optical path of the light reflected by or transmitted through a sample set in the sample fitting hole on the sample holder or the through hole, and direct the light toward a single exiting side beam switching mirror, and the exiting side beam switching mirror capable of switching the direction of the light projected via the received light reflecting means toward a single detector, and the absolute reflectance and the absolute transmittance for the face side incidence and the back side incidence of the sample.
Abstract:
A side-entry excitation arrangement is provided with a multi-channel analyte-separation device. In various embodiments, a plurality of channels are disposed in an array, with a laser disposed to direct an excitation beam of light along a beam path that crosses the longitudinal axes of the channels, so as to simultaneously irradiate a region of each of the channels. Devices of the invention can be useful, for example, in the separation and analysis of bio-molecules, such as DNA, RNA, etc.
Abstract:
An optical measuring arrangement, particularly for quality control in continuous material flow processes, comprising a measuring head which is arranged immediately adjacent to a measurement object, a measurement light source which is held at the measuring head for illuminating a measurement spot on the measurement object, a measurement light reception device, at least one spectrometer which is optically coupled with the measurement light reception device via a light-conducting device, wherein the spectrometer and the light-conducting device are received in the measuring head, and a signal processing device which is likewise received in the measuring head. This results in a compact arrangement for reflection measurement which is easy to assemble and which, beyond this, supplies very accurate measurement results. Further, a measuring arrangement operating on the principle of spectroscopy is suggested for transmission measurement. The disclosure further relates to a combined reflection and transmission measurement device which carries out both measuring processes simultaneously.
Abstract:
A spectroscopic apparatus comprises a housing, a light source supported by the housing, a sample optical detector supported by the housing, an optical input selection device supported by the housing, a plurality of optical source lines, and a plurality of optical return lines. The optical input selection device is rotatable about a first axis and comprises a first internal optical fiber having a first input end and a first output end. The first input end is disposed collinearly with the first axis, and the first output end disposed at a radially offset distance from the first axis. The optical source lines have respective source line input ends. Each source line input end is selectively optically alignable with the first output end. The optical return lines have respective return line output ends. Each return line output end is supported by the housing and selectively communicates with the sample optical detector.
Abstract:
The invention relates to a method and an apparatus according to the method. A sample is illuminated by a band of optical radiation the illumination state of which is variable as a function of time. Reference measurements of the spectrum of the optical band illuminating the sample are made at least at three separate instants of time. A spectrum of a band of the optical radiation that has interacted with the sample is measured at the corresponding separate instants of time as the reference measurement, and the radiance transfer factor matrix of the sample is estimated from the set of reference measurements and the set of sample measurements.
Abstract:
Solid phase methods for the identification of an analyte in a biological medium, such as a body fluid, using bioluminescence are provided. A chip designed for performing the method and detecting the bioluminescence is also provided. Methods employing biomineralization for depositing silicon on a matrix support are also provided. A synthetic synapse is also provided.
Abstract:
A color spectrophotometer incorporating a low cost commercial imaging chip, which normally forms part of a document imaging bar used for imaging documents in scanners, etc., having multiple photo-sites with three different rows of color filters. Each chip is mounted on the optical axis of an imaging lens system, in the image plane of that lens system, to image the reflected illumination from an illuminated color test target area on the chip. The optical axis of the imaging lens system is oriented at 45null to the illuminated color test patches, and the photodetector chip is physically mounted perpendicular to the plane of the illuminated color test patches. Respective photo-sensor chips and associated 1:1 optics may be mounted on opposing sides of the spectrophotometer physically oriented at 90null to the test target area plane receiving the reflected light from the test target optically oriented at 45null to the illuminated test target.