Abstract:
The grating of an asymmetric, double pass, grating monochromator has an axis of rotation which extends at an angle Psi relative to a normal to a plane H H''. That plane is normal to, and bisects, a line extending between the monochromator entrance and exit slits. The angle Psi is characterized in that spectral overlap is substantially elmininated.
Abstract:
The invention concerns the use of mirrors and a source of sample exciting light arranged in such relation to a sample zone that source light is caused to pass many times through a sample in that zone for increasing substantially the intensity level of Raman light emission from the sample.
Abstract:
THE INVENTION CONCERNS THE PROVISION, IN A CONTROL SYSTEM FOR MAINTAINING NEAR AN OPTIMUM LEVEL THE AMPLITUDE OF OSCILLATION OF DIFFERENTIAL RETARDATION INTRODUCED IN A POLARIZED LIGHT BEAM BY A CYCLICALLY VARIABLE RETARDER, OF MEANS RESPONSIVE TO A LIGHT BEAM EMERGENT FROM THE RETARDER FOR CYCLICALLY DRIVING THE RETARDER. IN ONE EXAMPLE, SELF-RESONANT OSCILLATION OF THE RETARDER IS MAINTAINED BY THE OUTPUT FROM A SENSOR ATTACHED TO THE RETARDER, AND THE AMPLITUDE OF OSCILLATION OF THE PLATE IS CONTROLLED BY THE LIGHT BEAM EMERGENT FROM THE RETARDER, ALL IN SUCH
MANNER THAT A STABLE EQUILIBRIUM VIBRATION AMPLITUDE OF THE RETARDER IS MAINTAINED, PRODUCING PEAK RELATIVE OPTICAL PHASE DELAY.
Abstract:
A high resolution or high maximum bandwidth monochromator is provided with certain control means for controlling one jaw of an intermediate slit pair, and other control means for independently controlling the jaws in each pair of entrance, exit and intermediate slits, the monochromator being useful for exploratory research work as well as routine analysis.
Abstract:
The invention concerns simplified automatic control of the peak birefringence of a modulator which is operable upon a linearly polarized beam of radiation to derive a modified beam having cyclically varying elliptical polarization. Simplified automatic compensation of the electrical drive signal applied to the modulator drive transducer functions solely in response to variations in the character of a beam of radiation that has passed through the modulator.
Abstract:
A SPECTROPOLARIMETER HAVING A CONTROL UNIT FOR SUBSTANTIALLY ELIMINATING ERRORS THAT WOULD OTHERWISE OCCUR IN
THE MEASUREMENT FROM ONE WAVELENGTH TO ANOTHER AND FROM ONE SPECIMEN TO ANOTHER. THE CONTROL UNIT INCLUDES A ZERO-CORRECTION SUB-UNIT, A DEFLECTION SIGNAL SUB-UNIT AND A BALANCING SUB-UNIT. THE ZERO-CORRECTION SUB-UNIT MAKES SUCH ZERO-CORRECTION POSSIBLE THROUGHOUT THE ENTIRE SPECTRUM. THE BALANCING SUB-UNIT MAKES IT POSSIBLE TO SHIFT THE ZERO LEVEL TO FACILITATE RECORDING ON AN ENLARGED SCALE THE SIGNIFICANT DATA OF A SPECTROPOLAROGRAM. THE BALANCING SUB-UNIT ALSO MAKES IT POSSIBLE TO RECORD DIFFERENT SPECTROPOLAROGRAMS AND EVEN DIFFERENT PARTS OF THE SAME POLAROGRAM TO DIFFERENT SCALES.