Abstract: A flux containment device entraps an unneeded portion of the radiated ene emitted by a reference source lamp so that a determinable amount of radiation is projected to electro-optical sensors for calibration purposes. A double-walled, concentric can-shaped enclosure, provided with a nonreflective coating on its inside surfaces, has an aligned calibration optical axis aperture for projecting the determinable amount of radiation and a diametrically opposed light trap opening to accommodate a light trap that eliminates unwanted reflections. The double walls are held apart by nonconductive spacers to avoid unwanted heat transfer. A fan forces cooling air through an appropriately located vent hole in the can-shaped enclosure to avoid direct impingement on the lamp.

Abstract: A method and apparatus is provided for detecting and rejecting spurious sals that may arise in incoming data. A remotely disposed data producing sensor for each sensor data channel and a single blind data channel extend to a receiver or a recorder. A data link is provided linking each sensor channel to the recorder and a one-shot multivibrator generates a sensor channel pulse whenever a signal having less than a predetermined rise time and exceeding a predetermined magnitude comes through the sensor data channel. Another one-shot multivibrator coupled to the blind channel generates a blind channel pulse whenever a signal satisfies the same conditions as for the sensor channel. An AND gate associated with each sensor data channel initiates an interruption of the data link for the duration of a coincident receipt of the sensor channel pulse and the blind channel pulse to connect a d.c.

Abstract: An improvement for a photomultiplier tube having its cathode, dynodes and ode spaced apart within an envelope increases the tube's linear dynamic range capability. A constant and stable collection potential is maintained between the anode and the dynode nearest the anode. In one form a zener diode voltage source and serially connected resistor are used or a fixed voltage is appropriately connected separate and distinct from the dynode potential connected across the other dynodes and the cathode. Thusly modified, a light flux range of approximately eight orders of magnitude can be accommodated by the improved photomultiplier tube circuitry.

Abstract: A coaxial cable is fed through a wall without introducing electrical reflections or otherwise compromising the cable's electrical integrity. A cylindrically-shaped housing having a cavity is inserted through an opening in the wall and is locked in place while an o-ring seals the juncture. A curable adhesive compound fills the cavity and adhesively engages an exposed length of cable shielding and the inner wall of the cavity. After the compound cures, a watertight interconnection and penetration of the wall is formed without compromising the cable's electrical integrity.