Powerful Laser Diode Matrixes for Active Vision Systems
— This article is deal with the experimental investigations of the laser diode matrixes (LDM) based on the AlGaAs/GaAs heterostructures (lasing wavelength 790-880 nm) to find optimal LDM parameters for active vision systems. In particular, the dependence of LDM radiation pulse power on the pulse duration and LDA active layer heating as well as the LDM radiation divergence are discussed.
The Influence of Temperature on Pulse Duration and Spectrum of Laser Diode Matrixes Used for Range-gate Vision Systems
The present paper is aimed to assessment of the impact of the module of ther-mostabilization on the illumination module, and assessment of their mutual influence on work of a system in general.
STUDIES ON TERRESTRIAL CONTAMINANTS OF METEORITES
During t h e l a s t ha l f d e c a d e a n unpara l le led upsu rge h a s t aken p l ace in t h e s tudy of meteor i tes , e s p e c i a l l y t h e ca rbonaceous chondr i tes . S c i e n t i s t s from all ove r t h e world, employing t h e newes t a n d most s e n s i t i v e an a1 y t i c a l t ec hni q u e s , i n v e s t i g a t e t h e ch e m i c a l composition of t h e o rgan ic mate t ia l found in t h e s e meteor i tes . In t h i s way they a r e trying to de te rmine t h e phys ica l c o n s t a n t s of t h e meteor i tes and e s t a b l i s h , on t h e b a s i s of minera logica l and petrolog ica l s t u d i e s , t h e cha rac t e r i s t i c s of t h e environmental condi t ions f r o m which t h e s e s t o n e s or ig ina ted and to desc r ibe and ident i fy cer ta in mic ros t ruc tu res which abound in s o m e of t h e s e ca rbonaceous chondr i tes . A l l of t h e s e research i n t e r e s t s a r e d i rec ted towards o n e pa r t i cu la r problem, t h e def in i te so lu t ion of which may indeed have revolutionary e f f e c t s o n ou r c o n c e p t s of t he universe. T h e ques t ion is whether or not t h e s e meteor i tes conta in t r a c e s of ex t ra t e r r e s t r i a l l i fe , t hus proving tha t some kind of biota eve r e x i s t e d o ther t han on t h e ear th , o r if a l l of t h o s e f ea tu res tha t t end to subs t a n t i a t e t h e prev ious ly mentioned h y p o t h e s i s a r e only t h e r e s u l t of contaminat ion by te r res t r ia l matter. T h e impor tance of t h i s problem w a s emphas ized by Berna l (1961: 130) in t h e following way: “ T h e v i t a l ques t ion cou ld be s e t t l e d o n c e and for a l l if s p e c i f i c molecu le s s u c h a s porphyrins o r nuc leo t ides were found. A counter ind ica t ion a t t he moment is t h e extremely low phosphorous conten t of t h e meteorite.” S ince tha t s t a t emen t w a s made, porphyrins (Hodgson & Baker, 1964) a n d poss i b l y nuc leo t ides (Nagy et al., 1963a) have been ident i f ied f r o m t h e Orgueil meteor i te , but s t i l l t he q u e s t i o n of t h e e x i s t e n c e of extrat e r r e s t r i a l life is far from be ing proven. I t is clear from the a b o v e tha t o n e of t h e b a s i c problems tha t o n e faces in t h e s tudy of meteor i tes is tha t of contamination. In order t o e s t a b l i s h unques t ionably t h e e x i s t e n c e o r p a s t e x i s t e n c e of ex t ra te r res t r ia l l i f e through t h e s t u d i e s of meteor i tes , two primary q u e s t i o n s h a v e to b e dea l t with s imul taneous ly . O n e h a s to d e c i d e