51
Donald S Peterson, Andrew P Taussig: Signal transition detection method and system. Spectra Physics, Killworth Gottman Hagan & Schaeff, June 7, 1988: US04749879 (76 worldwide citation)

A system and method are provided for determining the occurrence of transitions in a binary encoded analog input signal. The system includes a threshold circuit, responsive to the input signal, for generating first and second grating signals in dependence upon whether the input signal exceeds or is l ...


52
Louis A Kamentsky, Isaac Klinger: Combined particle sorter and segregation indicator. Bio Physics Systems, Curtis Ailes, October 5, 1976: US03984307 (75 worldwide citation)

Small particles to be sorted are entrained in a stream of fluid and particle differences are detected to control a sorter located downstream. The sorter is effective to switch the particle carrying fluid to one of two different paths determined by the particle differences to thereby accomplish the s ...


53
Robert B Slusher: Single axis beam scanner. Spectra Physics, Donald C Feix, June 14, 1983: US04387952 (74 worldwide citation)

Two concave spherical metal mirrors are used to scan a continuous wave laser beam for heat treating of metals. The mirrors are rotated in opposite directions and each is tilted at a small angle with respect to its axis of rotation. The frequencies of rotation of the mirrors are made constant by a pr ...


54
Joseph F Rando, Ilya M Fishman: Temperature operated gas valve. Spectra Physics, Donald C Feix, Paul Davis, Thomas M Freiburger, August 21, 1990: US04949742 (74 worldwide citation)

A gas valve which is particularly useful in a laser gas fill system requiring repeated fillings includes a conduit positioned between high and low pressure gas regions. Within the conduit is a restriction, and this restriction is closed by a meltable solid material. When the valve is to be opened, h ...


55
Leon B C deVos, Johannes N Th M Schouten: Computer aided three dimensional positioning sensing system and method. Spectra Physics, Killworth Gottman Hagan & Schaeff, August 11, 1992: US05137354 (72 worldwide citation)

A position sensing system calculates the X-Y-Z coordinates of a point in space using triangulation and determines the orientation of an object located at that point. The triangulation calculation is based on the coordinates of at least three retroreflective elements spaced apart from each other and ...


56
P Guy Howard: Hand held bar code reader with modulated laser diode and detector. Spectra Physics, Donald C Fix, Paul Davis, T M Freiburger, September 15, 1987: US04694182 (72 worldwide citation)

A hand held bar code reader employs a laser diode as its laser source, for an efficient and compact construction. The diode is modulated, and an associated bar code reading detector is timed accordingly, so that (1) the effects of strong ambient light which may be present on the bar code surface can ...


57
Brett A Feddersen, Enrico Gratton, David W Piston: Method and means for parallel frequency acquisition in frequency domain fluorometry. Research Corporation Technologies, Scully Scott Murphy & Presser, October 26, 1993: US05257202 (72 worldwide citation)

A digital frequency domain fluorometer utilizing a computer-controlled digital data acquisition system is use for the study of fluorescence and phosphorescence phenomena in the bio-chemical, biological and bio-physics arts. The computer is used for the direct collection of data, as well as for the f ...


58
Thomas M Baer, Mark S Keirstead: Laser diode pumped solid state laser with miniaturized quick disconnect laser head. Spectra Physics, Paul Davis, May 12, 1987: US04665529 (71 worldwide citation)

A compact laser head for a solid state laser has a miniaturized laser rod and output coupling mirror which form a miniaturized laser cavity. A miniaturized frequency doubler crystal placed in the cavity provides frequency doubled output. The laser head is connected by an optical fiber to a separate ...


59
Joseph F Rando: Automatic plumb and level tool. Spectra Physics, Thomas M Freiburger, December 31, 1991: US05075977 (71 worldwide citation)

An automatic plumb, level and pointing tool uses a visible laser diode to project a beam in any of three different modes through a beam exit window. The tool, approximately the size and shape of a tape measure, can be placed on one edge to project a tilt-compensated vertical beam. Placed on another ...


60
John H Coleman: Method of forming semiconducting materials and barriers. Plasma Physics Corporation, October 7, 1980: US04226897 (71 worldwide citation)

In a gaseous glow-discharge process for coating a substrate with semiconductor material, a variable electric field in the region of the substrate and the pressure of the gaseous material are controlled to produce a uniform coating having useful semiconducting properties. Electrodes having concave an ...