Abstract: An instrument for measuring various and sundry parameters that are analog to the aberrations that may exist in holographic lenses and other energy diffraction apparatus is disclosed as containing: a laser energy source; a pair of masks for controlling precisely the path of the light from said laser energy source, so that it may be used as a reference parameter; a rotatable mounting table for holding the holographic lens being tested in an appropriate position in the path of said reference laser light path; a microscope positioned to receive predetermined laser light rays that have been diffracted by the holographic lens being tested; indicia to measure the X, Y and Z axes distances between that point on the holographic lens being tested where the aforesaid laser light path passes therethrough and a given point position on or with respect to said microscope; and a support bench upon which all of the aforesaid elements may be mounted, so that their respective relative positions may be controlled in such manner

Abstract: A microscope is disclosed as incorporating a light source which broadcasts light in succession through a holographic condenser lens, a transparent object support stage, an object to be magnified, a holographic objective lens, a holographic zoom lens assembly, a combination holographic redirector and magnifier lens, and a holographic eyepiece lens which may or may not be located on the same observational axis as the aforesaid holographic lenses. Said holographic eyepiece lens is constructed sufficiently large to accommodate the two eyes of a human observer at the same time, thereby providing binocular vision characteristics by a single lens. The aforementioned lenses associated therewith are also constructed to be optically complementary with said holographic eyepiece lens, so as to permit the latter to be used as a monocular lens.

Abstract: A sonar system is disclosed which processes received sonic energy echo sils in such manner as to determine whether or not a marine mine or other object of significance is laying on a particular area of sea floor being sonically scanned or searched and, in addition, whether or not said marine mine or other object has a sonic energy shadow behind it. If and when such two conditions are met, an alarm is given to the human operator monitoring the subject sonar system, so as to call his attention to the fact that a target of significance has been acquired.

Abstract: A recoil simulator is disclosed which generates various predetermined mots and forces that may be imparted to training guns, weapons, and other devices, so as to give them realistic operational characteristics which they otherwise would not have. To generate such motions and forces -- and, thus, to effect such operational characteristics -- a given mass is moved along a predetermined axis thereof while the displacements, velocities, and accelerations thereof are controlled by an unusual combination of mass positioning and cocking device, compression springs, and electric solenoids, the latter of which is timely energized by a unique electronic programmer circuit.

Abstract: Method and apparatus for mixing hydrogen and oxygen as a noncombustionable ixture of gases which avoids the hazard of a combustible mixing interface are disclosed as comprising a pair of cylinders which timely contains a water solvent within which said hydrogen and oxygen are respectively dissolved under pressurized and refrigerated conditions, in accordance with a predetermined program of operations. Then, the gas-saturated water of one of said cylinders is mixed with that of the other, thereby causing the gases therein to be mixed wthin the mixed water. The resultant gaseous mixture is subsequently separated from said water mixture, dried, and stores as a mixture of hydrogen and oxygen gases.

Abstract: A diving helmet exhaust regulator valve maintains helmet pressure substanlly constant in a push-pull system wherein breathing gas is supplied under pressure (push) at a constant rate and respired gas is exhausted to a low pressure (pull) conduit for return to a regenerator. The regulator valve is characterized by a throttling valve member operated by a piston that is acted upon by ambient sea pressure and helmet pressure independently of pressures in the upstream exhaust passages, or of exhaust flow rate.

Abstract: A low-noise, stage-stabilized, direct-coupled, single-ended amplifier cirt is disclosed which has a unique feedback network combined therewith in such manner that degenerative alternating current and substantially constant direct current feedback signals are supplied thereto, so as to effect an exceptionally steady amplification factor therefor over a very broad frequency response band.

Abstract: Phase detection between interfering light beams in an interferometric sys is accomplished by frequency shifting the reference beam prior to combination with the interrogation beam and electro-optically scanning the resulting pattern to produce an FM electrical signal having the shift frequency as a carrier and the interrogated parameter as the modulation data. A phase lock loop is responsive to the FM signal to provide a D.C. signal that is analogous of rate of change of the interrogated parameter with scan, and which is integrated to provide an output voltage signal that is proportional to the interrogated parameter and the corresponding optical phase difference. The method and system employing it are operative for a wide range of phase differences including multiple fringes.

Abstract: An improved cable or chain cutting implement comprises a two piece body pion with sharpened cutting edges on one end thereof. The two pieces of the body portion are configured so as to encompass a towing or sweep cable in gripping relation thereto. A spring retaining member holds the pieces of the body portion in operative relationship to one another and the towing or sweep cable. A plurality of these cutting implements may be attached to a single towed sweep line to comprise an improved, high speed mine sweeping system.

Abstract: A vehicle carried metal object sensing system wherein sensing of magnetic elds of different polarity or of ferrous and non-ferrous objects results in distinctive colors on a cathode ray tube display. Deflection signals are generated in accordance with vehicle travel and field scan to provide successive frames of a map-like display.

Abstract: An underwater vehicle having a water-tight, disconnectably-sectioned, prere-resistant, rugged, hull for carrying electronic instrumentation and other apparatus, a stabilizing tail section for altitude control, a manually adjustable negative-lift wing, and an adjustable bridle for the towing thereof by any suitable tractor vehicle.

Abstract: A laser type direct fire weapon simulator for action against a moving image isplay wherein the weapon is slaved connected to variable voltage producing devices such as potentiometers to provide voltage outputs corresponding to azimuth and elevation positions of the weapon, a voltage responsive beam deflector system for varying the direction of the laser beam on the display target in accordance with the azimuth and elevation voltages, a continuous reading delay monitor responsive to a delay voltage derived from the elevation voltage to provide prior time readout voltage data to an electro-optical system directing the laser beam such that when actuated the system shows the location where a missile would have hit allowing for delay time corresponding to elevation voltage, together with a delay trigger circuit which delays the display of the hit until the elapse of missile flight time corresponding again to elevation voltage and hence range.

Abstract: A variable area jet nozzle construction capable of blocking flow in favor another nozzle in a vertical or short take-off aircraft utilizes a balanced two-dimensional flap that is pivotable about rollers and movable, along curved tracks cooperable with the rollers, to assume a plurality of nozzle area varying or blocking positions under the influence of linear hydraulic actuators.

Abstract: An improved microphone assembly for use in a diver's mask or helmet and wh is characterized by a substantially flat frequency response at pressures from 1 to 30 or more atmospheres of breathing gas. A silicone rubber coated piezoelectric diaphragm is mounted by its periphery in a cylindrical housing with both sides of the diaphragm exposed to ambient gas pressures. A ground plate is mounted in said housing with one side in spaced relation to the diaphragm and having on the other side thereof a preamplifier and automatic gain control circuit electrically connected to the diaphragm and encased in waterproof potting compound.

Abstract: A portable pulsed signal generator which generates a low-frequency, high-ered signal from a constant direct current, low power source is disclosed as including an inverter for driving a plurality of motors which, in turn, actuate control switches by means of cams and cam followers associated therewith. A potentiometer driven by one of said motors, in turn, effectively controls the output of a direct current amplifier, with the varying direct current output signal therefrom having the alternate half-waves thereof polarity reversed by switch controlled relays, the switch of which is timely actuated by one of the aforesaid cams, cam followers, and other switches, respectively, so as to produce a low-frequency, high-power, substantially alternating current signal. After appropriate transduction said low-frequency, high-power, substantially alternating current signal may be employed for sweeping mines.

Abstract: An open circuit heat engine, utilizing air as the working fluid, is described wherein an intermittent flow heat exchanger recovers heat energy from spent air to add heat to air prior to expansion into the working chamber.

Abstract: A stabilizing drag and spin inducing device is described for an instrumen underwater vehicle. A flexible plastic disc having a central aperture and segmented into angularly offset vanes is pressed onto the vehicle probe section with resulting distortion causing the disc to assume a conical configuration. The vanes flex to increase drag on descent and decrease drag on ascent, while also assuming spin inducing pitch.

Abstract: A voice operated relay system is disclosed which includes signal processing ircuitry for receiving and discriminating with respect to human speech signals and for actuating a relay in response thereto. A power supply test is also included, as well as circuitry for preventing relay drop out due to input speech hesitations. The preferred embodiment of the subject system is disclosed as a means of enabling a cassette recorder and for causing it to record said human speech signals at either near or remote locations.

Abstract: An apparatus and method for detecting the presence of, and severing command ables submerged in an aqueous medium, utilizing a galvanic current pulse generated by a galvanic cell with one electrode thereof serving as a cable cutter.

Abstract: An array of circular, acoustic projecting and receiving transducers is deibed, including a stainless steel baffle plate in which the transducers are mounted, each comprising a stainless steel cup containing a disc-shaped piezoelectric element set in low impedance material and covered by a water impedance matching window. Capacitive and inductive tuning means is provided between each receiving transducer and its associated electronics.