Device for detecting impacts on a target
Apparatus for determining projectile position and barrel pressure characteristics
Multiple screen ballistic chronograph
Target engagement system for determining proximity to a target Patent #: 5067096
ApplicationNo. 998850 filed on 12/30/1992
US Classes:73/167, ORDNANCE AND PROJECTILE42/1.01, INDICATORS102/425, With position sensing means702/140, Within an enclosure702/149By distance and time measurement
ExaminersPrimary: Cuchlinski, William A. Jr.
Assistant: Gutierrez, Diego
Attorney, Agent or Firm
Foreign Patent References
International ClassesG01L 005/14
AbstractAn apparatus and method for measuring ballistics in a firearm is disclosed. The apparatus comprises (a) a device for measuring pressure in a firearm-firing-chamber disposed at least in part at the strain sensitive region, and for producing analog signals indicative of the pressure, and connected to digitizing circuits which record the amplitudes of the signals representing pressure as a function of time; (b) a plurality of muzzle bullet sensors for measuring the relative times at which the bullet passes the plane of each sensor and for producing analog signals indicative of these times, the analog signals being converted to digital signals and connected to digital timing circuits; and (c) an acoustic target located downrange and including (i) sensors arrayed at corners of a triangle for sensing acoustic energy emitted by a passing bullet and (ii) a device for generating analog signals representative of the acoustic energy sensed at the triangle corners. The pressure in the firing chamber is measured according to the formula: ##EQU1## and wherePSIMax is Maximum expected PSI,N is the gain port setting which is a digital setting to an amplifier gain port and is expressed as an integer from 20 to 255,G is the gage factor,D is the outside diameter of the firing chamber at the gage, andd is the inside diameter of the firing-chamber at the gage. Optionally, a plurality of bullet sensors may be located downrange in lieu of the downrange acoustic target. Analog signals are converted to digital signals which in turn are connected to timing circuits. Signals from the timing circuits are connected to a processor which calculates external and internal ballistics such as for example, velocity and time-of-flight using the common time-zero reference, and determines the location of "hit" at a target plane. The processor can be interfaced with a personal computer.