Abstract: A timing pulse generator for testing electronic components such as semiconductor memories, which tests require time accuracy and repeatability.A number of registers are provided for registering digital words which correspond to timing pulses to be generated. Each word includes information in a first portion as to the coarse start time of a particular pulse and information in a second portion as to the fine start time of the pulse. A counter circuit is provided with means for starting and stepping the counter in pedetermined increments through a plurality of states. A digital comparator compares the state of the counter with the coarse start time portion of the word stored in the register and generates an output pulse when the two coincide. A digitally controlled variable delay circuit is provided corresponding to each register. An output from the register corresponding to the fine start time portion of the word sets the amount of delay introduced by the delay circuit.

Abstract: Sample material of retention time peaks of a chromatograph are exposed to infrared radiation at first and second wavelengths and the absorption of the infrared energy by the sample peak is measured. The measured infrared absorption at the first and second wavelengths is correlated with the retention time of the sample peak as an identification of the sample material. In addition, overlapping retention time peaks are resolved by detecting the change in the ratio of the infrared absorption at the first and second wavelengths as a function of retention time for a given peak.

Abstract: The present invention relates in general to methods for making pick-up screens for X-ray image intensifier tubes and, more particularly, to an improved method wherein the X-ray fluorescent phosphor screen element is formed by evaporation of an alkali metal halide material in vacuum and condensing the evaporated material on an X-ray transparent portion of the X-ray intensifier tube, whereby a curved X-ray image pick-up screen is formed which has improved quantum efficiency and resolution. Such improved X-ray image intensifier tubes are especially useful for, but not limited in use to, X-ray systems and for intensifying gamma ray images obtained in applications of nuclear medicine.