[특허]Apparatus and method for measuring and calculating exterior and interior ballistics

Apparatus and method for measuring and calculating exterior and interior ballistics 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01L-005/14 G01P-005/18 G01P-013/00 G01S-015/00
출원번호	US-0998850 (1992-12-30)
발명자 / 주소	Oehler Kenneth L. (1308 Barclay Dr. Austin TX 78746)
인용정보	피인용 횟수 : 26 인용 특허 : 0

초록 ▼

An 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: [Figure] [Figure] and where PSIMax 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, and d 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.

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An apparatus for measuring ballistics in a firearm comprising in combination: (a) an outside-surface-mounted means for measuring pressure in a firearm firing-chamber according to the following formula: [Figure] where the voltage amplifier gain equals 32500/N and N is computed by: [Figure] and where PSIMax 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, and d is the inside diameter of the firing chamber at the gage; and producing an analog signal indicative of said pressure; (b) a target means located at a predetermined point producing an analog signal indicative of time; (c) means for receiving separate streams of analog signals from said means for measuring pressure and from said target means, and for converting said separate streams of analog signals from analog to digital form and for outputting said separate streams as digital signals: (d) signal receiving means for receiving said separate streams of digital signals as a data output set; and (e) means for computing an estimated velocity and ballistics from said digital output set. A method for integrated measuring and calculating exterior and interior ballistics of a bullet fired from a firearm having a muzzle comprising the steps of: (a) measuring the pressure in the firing chamber of the firearm using the following formula: [Figure] [Figure] p1 and where PSIMax 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, and d is the inside diameter of the firing-chamber at the gage; (b) measuring the velocity of a bullet by means of at least two detectors located at a first predetermined location near the firearm muzzle; (c) measuring a period of time said bullet reached a second predetermined location downrange from the firearm by detecting a presence of said bullet.; and (d) computing a velocity of said bullet at said second predetermined location downrange by a determination of a ballistic coefficient based upon (i) said velocity, (ii) said time measurement, and (iii) a standard drag function representative of said bullet.

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