ii New Patents

having an optically transparent wall and an op- posing optically reflective wall. Two coherent laser beams, a pump beam and a broadband Stokes beam, are directed through the window and focused on a portion of the sample. In the preferred embodiment, a projectile is fired from a high-pressure gas gun to impact the outside of the reflective wall, generating a planar shock wave which travels through the sample toward the window. The pump and Stokes beams result in the emission from the shock-compressed sam- ple of a coherent anti-Stokes beam, which is em- itted toward the approaching reflective wall of the vessel and reflected back through the win- dow. The anti-Stokes beam is folded into a spectrometer for frequency analysis. The results of such analysis are useful for determining chem- ical and physical phenomena which occur during the shock-compression of the sample.

4556315

PROCESS AND APPARATUS FOR THE EMISSION-

SPECTROSCOPICAL TESTING OF METALLIC SAMPLES

Wilhelm Berstermann, Georgsmarienh Federal Republic Of Germana assigned to Klockner- Werke Aktiengesellschaft

During the emission-spectroscopical testing of metallic samples by means of unipolar dis- charges, material is precipitated onto the coun- terelectrode material which leads to faulty test results. According to the invention, at the start of the pre-spark period half waves of the unipolar discharge are replaced by oscillating discharges,

wherein two parallel-connected discharge capacitors and two series-connected discharge resistors, one discharge capacitor and one dis- charge resistor can be shunted and the shunting is canceled out after a prespecified period of time, starting with the pre-spark period.

4556847

METHOD OF QUANTITATIVE ANALYSIS OF SUBSTANCES AND

NUCLEAR-RESONANT QUANTIT&/Wr;F;;ALYZER

Evgeny K Aspiotis, Boris Y Vitjuk, Evgeny I Malakhov, Boris Danshin, Vladimir A Sokolov, Anatoly S Sidorov, Leonid Volkov, Krasnodar, Union Of Soviet Socialist Republics assigned to Vsesojuzny Nauchno-Issledovatelsky Institut Maslichnykh Kultur Imeni V S Pustovoita

A method of quantitative analysis of substances based on nuclear magnetic resonance comprises the steps of weighing a sample of substance to be analyzed, obtaining therefrom and ac- cumulating nuclear magnetic resonance signals during n measuring cycles, computing a mean value of the nuclear magnetic resonance signals, and determining percentage of components in the sample being analyzed with regard to its mass and the mean value of the nuclear magnetic resonance signals. The mean value of the ac- cumulated signals and its standard deviation are computed as the accumulation occurs during each of the n measuring cycles, the subsequent step being subtraction of the standard deviation from the permissible limiting standard deviation value whereupon the accumulation is stopped during the nith cycle in which a difference bet- ween said magnitudes is a positive value. A nuclear-resonant quantitative analyzer for ac- complishing the aforesaid method comprises a magnetic system, a nuclear magnetic resonance signal pick-up arranged in its gap, an amplifier, a