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In measurements of circular polarization of gamma rays in which the radiation is detected by a scintillator coupled to a photomultiplier, the phototube has to be shielded from the reversible fringing magnetic field of the polarization analyzer. Weak residual fields, however, produce a small gain...
An improved magnetic densimeter utilizing optical sensing and solid state components is described. The system has been calibrated with sucrose solutions at 20°C demonstrating a sensitivity of 1 ppm and a precision of 5 ppm. A density measurement can be made on 0.3 ml of solution in 10 min. The...
The applicability of pyroelectric thermometry to temperature change or temperature rate measurement at low temperatures was studied, with particular emphasis on calorimetry. The pyroelectric coefficients, dc dielectric constants, and volume resistivities of three ferroelectric ceramic materials,...
A speed control has been designed for the Beckman model E analytical centrifuge which employs as the velocity transducer a photoelectric pickoff and a digital counter. The controller regularly gives a short term stability of one part in 20 000 and a long term stability (24 h) of one part in 10...
A new technique for time calibrating an image‐converter streak camera by repetitively photographing a standard signal displayed on a wide‐band sweep‐delay oscilloscope is described.
An electro‐optic shutter has been realized for use as a component of a Nd glass laser system delivering high peak power pulses. Its main characteristics are (a) switching time less than 1 nsec and (b) dynamic contrast ratio (i.e., peak pulse intensity∕intensity preceding the leading edge)...
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