Abstract:
An ink regulating device that measures color in a web-fed rotary printing machine for printing a printing material web or sheets in a plurality of colors. The ink regulating device measures and evaluates the colors black, cyan, magenta, and yellow, and after general calibration (i.e., the recording of standard values), derives set values for the inking zone setting devices, without requiring any further patterns, and without the need for a special copy when the printing pattern is changed.
Abstract:
A double-beam interferometer for electromagnetic radiation and a method for the compensation of dispersion or increase in the spectral resolution of such an interferometer. Using a polarizer, which is brought into the optical radiation path, a defined polarization state P½0 is produced for the electromagnetic partial waves flowing into the arms of the interferometer. This polarization state is wavelength-independent and can vary for both partial beams. Optical elements modify the polarization state P½0 of the electromagnetic partial waves as a function of wavelength &lgr; and each spectral component &lgr;i is coded with a polarization P½ (&lgr;i). An analyzer, fitted to the output of the interferometer, transmits an adjustable polarization state Pdet, whereby an additional wavelength-dependent phase difference &ggr;(&lgr;) occurs between the partial waves of the spectral components. &ggr;(&lgr;) can be adjusted to obtain compensation of dispersion or an increase in the spectral resolution of the interferometer.
Abstract:
An optical monochromator has high signal selectivity and low insertion loss, and is well-suited for characterizing a variety of optical signals, including closely-spaced optical channels within DWDM systems. The optical monochromator includes a bulk-optic polarization beam splitter that separates orthogonal polarization states of an applied optical signal into separate optical beams. Low insertion loss is achieved by reconciling the polarization states of the separate optical beams to an optimum polarization state that minimizes insertion loss when the optical beams are applied to a dispersive element. High signal selectivity is achieved using a multipass configuration and by illuminating large areas of the dispersive element, since large beam diameters are accommodated by the bulk-optic polarization beam splitter.
Abstract:
In order to determine the color stimulus specification of a translucent object under test, it is suggested to illuminate the object under test with light having different wave length bandwidth portions, or, alternatively, to subdivide the light reflected by the object under test into different wave length bandwidth portions before it is captured by an image sensor. To exactly approach a probe head to the object under test, the object under test is visualized with the help of a further image sensor. Preferably, two image sensors are used, whereby the one image sensor is used for visualizing the object under test and the other image sensor is used for determining the colorimetric data of the object under test. In this way, the color stimulus specification of the object under test can be determined very exactly. Moreover, such a method including an apparatus suitable for performing the method can be practically realized very easily.
Abstract:
The present invention provides methods and devices for measuring radiation absorption by a sample. The invention enables one to determine whether the sample scatters the radiation of interest and, if so, to factor out the effects of such scattering and ore accurately determine the true absorption of the sample. The invention may employ a selectively controllable occluder which is moved between three or more different positions to yield three or more different radiation measurements. These measurements can then be compared to one another to determine the nature of any radiation scattering and factor out its effects, enabling more accurate absorption determinations.
Abstract:
An interferometric spectrum analyzer employs a pair of Bragg cells arranged in an optically cascaded configuration such that both the signal beam and the reference beam travel along a common optical path. The beam-modifying properties of the Bragg cells are such that within a prescribed bandwidth of operation, the deflection properties of the respective cells are frequency complementary, namely different frequencies applied to the respective cells deflect the beam passing therethrough along the same optical path, to produce a beat frequency at the Fourier transform plane. In accordance with a first embodiment, complementary deflection action is achieved by using Bragg cells having respectively different acoustic velocites. In a second embodiment, each Bragg cell has the same acoustic velocity. The deflection/frequency complementary effect is obtained by the use of a birefringent material prism interposed between the Bragg cells, which produces angular deviation that depends upon the polarization and the direction of propagation of light passing through the prism.
Abstract:
A manual device for the detection of photometric data which includes a measuring head to illuminate a measuring surface and to detect the light reflected. The measuring light captured by the measuring head is spectrally decomposed by a monochromator containing a diffraction grating. The intensity of the light exiting through an outlet diaphragm is detected by a photodetector. The spectral position of the measuring light is set by a drive motor rotating a grating shaft connected with the holder of the diffraction grating. From the spectra detected, densitometric and colorimetric data are calculated by a computer, which together with the spectra determined, may be displayed on a display field.
Abstract:
Color detection apparatus wherein only light that has been diffuse-reflected, and has not been mirror-reflected, from the object whose color is to be detected is processed. Light from a source passes through a first polarizer before the light is incident on the object whose color is to be detected. Light reflected from this target object passes through a second polarizer which blocks all mirror-reflected light while permitting a portion of the diffuse-reflected light to pass. After passing through the second polarizer a portion of the light is directed onto a color filter after which the intensity of the transmitted light is detected. The intensity of the portion of light not applied to the color filter is also detected. The ratio of the output of the two detectors is a function of the color of the reflected light. The principal axis of the light incident on the target object is coincident with the principal axis of the reflected light that is to be processed, thus eliminating the need to accurately position the target object.
Abstract:
Devices, systems, and methods for distinguishing tissue types are described herein. Such devices and systems may use dual polarization, conformal filters to acquire image data from target tissues and a processor to create an image in which the contrast between tissues has been enhanced.
Abstract:
A monolithic optical retarder formed from a monolithic prism may include an input face for receiving a light beam, an output face aligned with an optical axis of the light beam prior to entering the input face, and three or more reflection faces. The three or more reflection faces may be oriented to provide an optical path for the light beam from the input face to the output face via reflection by the three or more reflection faces, where the monolithic optical retarder imparts a selected optical retardation on the light beam based on total internal reflection on at least one of the reflection faces. Further, the input face, the output face, and the three or more reflection faces may be oriented such that an optical axis of the light beam exiting the output face is equal to the optical axis of the light beam entering the input face.