Abstract: Methods and apparatus for detecting the impact of munitions in a predefined arget region during weapons training. The apparatus includes a plurality of photo-detectors (12), each of which has a predetermined field of view in the horizontal plane, the target range being defined by the logical union of these fields of view. The impact of a munition within or without the target area causes a signal to be transmitted (14) to a receiving location which is proximate the gun site. At the receiving location (21), the incoming signals from the plurality of sensors are subjected to logical operations (24) which indicate to the operator of the gun whether or not the projectile impacted within or without the target area, or to the left or to the right of the target area. In addition, a running total (79) is kept of the number of successful impacts.

Abstract: The present invention discloses an in-flight testing of projectile and mor fuzes. A microminiature electronic circuitry in a cartridge form is designed to attach to any of the large caliber shell or mortar fuzes. The test-cartridge is a recoverable, reusable, high-g hardened device. The system for sampling and recording projectile fuzes during a period of target impact comprises: a power supply; a timing and control logic unit; an accelerometer; an amplitude encoder; a shift register; and an interface connector to transform stored information of the fuze functioning characteristics to a ground station readout unit.

Abstract: A projectile strain damage indicator utilizes a plurality of strain gages xedly disposed on the orthogonal axes of a structural beam member which is operatively located within the ogive of a projectile. The strain gages provide electrical pulses to an energy conserving micropowered circuit which records strains only above a predetermined level that the projectile is subjected to while in transport.

Abstract: Three photometers are positioned at three points P.sub.1, P.sub.2 and P.s3, aligned with each other and with an illuminating flare, and located at equal distances d from each other, with the middle photometer at a distance D, greater than d, from the flare; the illuminations E.sub.1, E.sub.2, and E.sub.3 simultaneously received by the three photometers from the flare are recorded; and the transmissivity T, or transmission per mile, of the atmosphere traversed by the light is calculated from the formula: ##EQU1## where the E values are in foot candles and d is in miles.