Abstract:
A computer based system for testing an optical monitoring system includes a program (212) having program instructions and optical monitoring system parameters, for implementing a plurality of tests of an optical monitoring system. A computer (202) includes at least one processor for executing the program instructions, storage components for storing program instructions and test data, including the optical system parameters, a user input for inputting commands, and a display for displaying a menu of available test commands, test results and other data. An interface (210) is provided for interfacing the optical monitoring system to the computer for exchange of control and data signals. A fixture (208) is provided for mounting the optical monitoring system during testing.
Abstract:
The spectro-colorimetry apparatus disclosed comprises an opto-electronic card (12) on which are gathered the essential elements of the apparatus, and particularly a spectrometer (14) with an input slot (16) and a strip (18) of photosensors (20), two optical fiber calibration lines (26) and two optical fiber measurement lines (28), the extremities of the optical fibers being superposed in the input slot (16) of the spectrometer. The apparatus is particularly intended to be used in an industrial environment.
Abstract:
A sample holder and shutter assembly (20) for photometers in which a stationary sample chamber body (40) is mounted in close proximity to a photosensitive device (18). A light path is provided from the sample chamber (53) to the photosensitive device (18) and shutter means is provided for selectively interrupting and opening the light path between the photosensitive device (18) and the sample chamber (53) without moving the sample chamber. Heat exchange means including a heat pump (63) and a heat reservoir (68) are provided for maintaining a desired temperature in the sample chamber (53). The sample chamber body (40) is thermally connected to said heat pump (63) and is preferably thermally isolated from the means mounting it. In one embodiment, the heat pump (63) and heat reservoir (68) are flexibly connected.
Abstract:
A spectrometer for determining the spectrum of a medium irradiated by a wide-band radiation lamp, with a light guide for transmitting the light from the sensing point to the spectrometer and/or from the lamp to the sensing point and with an evaluation device for the acquisition and computer processing the light intensity sensed by a detector situated at the output of the spectrometer, depending on the wavelenght selected by the spectrometer, is characterized in that the light guide is made of an optical material with impurities that produce disturbance lines as a result of absorption, the concentration of the impurities and the length of the waveguide being selected so that the resulting intensities of the disturbance lines fall within the sensitivity range of the spectrometer, and in that the spectrometer and the evaluation device are designed so that the intensities of at least one disturbance line are determined in repeated comparative measurements.
Abstract:
A spectroscopic system for the analysis of small and very small quantities of substances makes use for the purposes of energy transfer of cone-shaped aperture changers (14, 15) which are arranged in the object zone (8) between the light source (L) and the sample (9) and, during absorption measurements, also between the sample (9) and the inlet slot (3) of a spectrometer (1). If the form used is a double cone, the aperture changers (14, 15) facilitate an oblique coupling in a capillary tube accepting the sample (9) which acts as a step-waveguide for the coupled radiation.
Abstract:
The invention concerns a double-beam spectrometer in which the measurement beam passes through the measurement cell and an entry slit into the spectrometer and the reference beam passes through a separate entry slit into the spectrometer. Both beams are split up into their spectral components by a diffraction grating. The spectrometer is designed to operate with a single photodiode array. In the spectrometer of the invention the two entry slits, the centre of the diffraction grating and the measurement and reference spectra lie in the same plane. Both spectra are recorded on a single-array detector, the +1 order measurement-beam spectrum being contiguous with the -1 order reference beam.
Abstract:
The object of the invention is a method for the separation of overlapping absorption bands of a spectrum from one another, in which a part of the absorption bands of the gas being measured and of an interfering gas compound occur in the same wavelength area. The content of the gas being measured is obtained by means of the following stages: a pure spectrum of the interfering gas compound at the comparative content is entered into the memory; a pure wavelength area is chosen from the interfering gas compound spectrum, which does not overlap the spectrum of any other substance contained in the gas being investigated; the spectrum (S0) of the gas mixture being investigated is measured and entered in the memory; the wavelength area of the above-mentioned pure area is determined from the measured spectrum, and the relative content value of the interfering gas compound in the gas being investigated is calculated by means of it; the spectrum of the interfering gas compound is calculated by means of the calculated content value, when the interfering spectrum contained in the measured spectrum is obtained; the measured spectrum is divided by the calculated interference spectrum, in which a corrected spectrum (S1) is obtained.