Abstract:
A method of scanning and/or distinguishing colors comprising opto-electrically scanning the colors, generating electrical signals the time variation of which correspond to the spectral intensity distribution of the colors and distinguishing the colors by automatically determining the position of the maxima of the electrical signals.
Abstract:
The disclosure describes apparatus for instantaneously determining the concentration of a predetermined substance that absorbs radiant energy within a predetermined band of wavelengths in the presence of other interfering substances that also absorb radiant energy in the region of the predetermined band. The determination is made by generating multiple wavelengths of radiant energy. The radiant energy is then sequentially transmitted in a single path through the substances, and the transmission is periodically interrupted by means which prevent the transmission of any radiation. The intensities of the radiant energy transmitted through the substances at the various wavelengths are then compared by electronic apparatus.
Abstract:
A method for automatically, continuously and quantitatively detecting a temper color appearing on a stationary or moving metal strip, in which a beam of light including a suitable component having a wavelength shorter than 540m Mu (5,400A) and another suitable component having a wavelength longer than 540m Mu is directed at a suitable angle to the metal strip, and after converting the intensity of the reflected light components into electrical signals and separating these electrical signals from each other, the ratio between these two electical signals is calculated so as to determine the relative depth of the temper color on the basis of the relative variation of the intensity ratio.
Abstract:
This invention relates to the light collecting heads of light measuring devices such as colorimeters. The head has a light collecting ring whose axis is a normal to the surface from which light is to be received, the ring being arranged to receive light from a discrete area of the surface from completely around the discrete area, the light received being arranged to pass through one or more light guides to a light detector. By viewing the discrete area of the surface from all directions around it, it is found that one can average out directional irregularities in reflection from the sample.
Abstract:
Absolute optical density measurements in the reflection mode as well as the transmission mode are possible with the single beam spectral densitometer. The light source is movable at a fixed radius about a point located centrally of an aperture provided in a support on which a specimen to be investigated is placed, making it possible to use the same light source for the transmission and reflection mode. With the light source as described, the calibration obtained with the light source positioned for the transmission mode is valid for the reflection mode. Provision is made to correct for any changes in the photomultiplier tube and the light source of the densitometer by measuring the output of the photomultiplier when applying the light source to the photomultiplier tube via fiber optics and several different interference filters. A light emitting diode provides a source of light which before each output measurement is directed to the photomultiplier tube to minimize hysteresis and space charge effects. A series of interference filters covering the optical spectrum are used when making density measurements. These are mounted on a first filter wheel. Separate neutral density filters which are mounted on a second filter wheel are used for calibration.
Abstract:
A colorimeter probe includes a removable, disposable probe tip with a chamber formed at the outer end of the tip to receive the solution under investigation. In one embodiment of the invention, the probe is in the form of an elongated housing having a light source remote from the probe tip and directs light along a first path toward a reference photocell and simultaneously along another path which extends through the solution chamber and then to a signal cell. In another embodiment of the invention, the light source and sensors are remote from the probe and are optically connected to the probe by means of optical fibers.
Abstract:
A COMBINATION TEACHING AID AND MODULAR INSTRUMENTAL ANALYSIS SYSTEM IN WHICH A PLURALITY OF MODULES ARE PROVIDED, EACH HAVING A SEPARATE FUNCTION, AND IN WHICH THE DIFFERENT MODULES ARE ADAPTED TO BE PLACED TOGETHER IN DIFFERENT COMBINATIONS TO PROVIDE DIFFERENT OPTICAL ANALYSIS INSTRUMENTS. THE MODULES INCLUDE A LIGHT SOURCE FOR PROVIDING LIGHT, A DETECTOR MODULE FOR RECEIVING LIGHT WHICH HAS BEEN EXPOSED TO A SAMPLE COMPARTMENT MODULE WHICH RECEIVES ONE OR MORE SAMPLES TO BE ANALYZED, AND MANY INCLUDE DISPLAY MEANS IN THE FORM OF A METER OR THE LIKE FOR READING THE OUTPUT OF THE DETECTOR MODULE. THE COMBINATION MAY ALSO INCLUDE A MONOCHROMATOR UNIT FOR PROVIDING SUBSTANTIALLY MONOCHROMATIC LIGHT, AND A FILTER MODULE WHICH IS ADAPTED TO CONTAIN ONE OR MORE FILTERS THROUGH WHICH A LIGHT BEAM MAY BE PASSED FOR OBTAINING A BEAM OF DESIRED FREQUENCY. DIFFERENT ARRANGEMENTS OF THE VARIOUS MODULES WILL PRODUCE A SPECTROPHOTOMETER, A FILTER PHOTOMETER, OR A NEPHELOMETER. THE DESCRIBED MODULE UNITS ARE ARRANGED SO THAT AT LEAST SOME OF THEM MAY BE DISPOSED ON A BASE AND OPTICALLY ALIGNED BY MEANS OF COMBINATION ADJUSTING AND CLAMPING MEANS, SO THAT THE UNITS MAY BE THEREAFTER MOVED, OR REPLACED AS DESIRED WITHOUT AFFECTING THE ALIGNMENT THEREOF. THE DESCRIBED UNITS ARE CONSTRUCTED AND ARRANGED SO THAT ALL THE SIGNIFICANT OPERATIONAL AND FUNCTIONAL PROPERTIES OF EACH MODULE MAY DE DIRECTLY OBSERVED BY THE STUDENT. THEREFORE, EACH MODULE IS ADAPTED TO PERFORM A MINIMUM NUMBER OF FUNCTIONS, AND THE MODULAR CONCEPT AND THE CONSTRUCTION FEATURES ARE USED AS A TEACHING AID USED TO EMPHASIZE THE RELATION BETWEEN VARIOUS SYSTEMS OF OPTICAL INSTRUMENTAL ANALYSIS. THE FILTER COMPARTMENT MODULE AND THE SAMPLE COMPARTMENT MODULE INCLUDE HOLDER MEANS FOR HOLDING LIGHT FILTERS OR SAMPLE UNITS, AND THE HOLDER MEANS FOR HOLDING LIGHT SO AS TO FACILITATE INTERCHANGE OF THE SAMPLE HOLDERS AND FILTER UNITS, AND TO BE ADAPTED FOR USE WITHOUT CHANGE TO PERFORM DIFFERENT FUNCTIONS IN DIFFERENT INSTRUMENTAL COMBINATIONS.
Abstract:
A photometric emission detector is provided with an integral calibration source including a source of light and apparatus for controlling the passage of light and the quantity of light passed along the optical path via which induced radiant energy emissions are detected when the detector is in use.
Abstract:
This invention relates to a densitometer for measuring small differences in density. The densitometer comprises a light source providing a reference light beam for imaging on a reference object and a measuring light beam for imaging on an object whose density relative to that of the reference object is to be measured. Light reflected from the two objects is transmitted to a photodetector via an optical chopper that sequentially interrupts the transmitted beams. The photodetector produces sequential pairs of voltages which are applied to a logarithmic element in the form of a diode which produces pairs of logarithmic voltages for application to a polarity reverser which changes the polarity of one logarithmic voltage of a pair relative to the other voltage of the same pair. The voltages of each pair are then applied to an indicating instrument where they are utilized to give an indication of the difference in density between the two objects. The pairs of logarithmic voltages produced by the logarithmic element are also applied to a control circuit which controls either the intensity of the source or the amplification of the photodetector so that the voltages produced by the photodetector and applied to the logarithmic element are always within a predetermined range of amplitudes.
Abstract:
A portable color identification device which is used with a light source and visual observation for identifying the color of a given specimen and which includes a color reflecting surface, a plurality of filter means positioned between the light source and the color reflecting surface for filtering out selected wavelengths of the light that is transmitted from the light source, and a plurality of diaphragm means for allowing the passage of light in selective varying amounts from the light source to the color reflecting surface until the color of the reflecting surface matches that of the specimen.