This Projectile Velocity Measurement System (PVMS) comprises of Type 858 Optical Detectors set apart to generate an output pulse when a projectile passes immediately overhead. It is used in conjunction with the 817 timer unit.
The system can record velocities from as low as 10 metres per second to in excess of 5000 metres per second. The recordings can have an accuracy of better than 0.05%. Under normal conditions, the projectile would be detected at a height of up to 500 times the projectile calibre.
The 858 is sensitive with blue light illumination and is usable in nearly all outdoor lighting conditions. This rugged and sophisticated system will operate where background illumination conditions are as low as 50 foot-lamberts thereby enabling it to be used successfully on both naturally lit outdoor ranges, as well as artificially illuminated tunnel ranges. Infra-red light sources Type 788 are available for tunnel work.
The Optical Detectors are mounted on light alloy plinths from which they can be easily removed. This feature allows the plinths to be permanently installed on a range if required. The Detectors may also be mounted on the tunnel wall which allows untidy floor cable runs and obstructions to be avoided. For Forensic and other applications where the extent of base length variation is critical, fixed-spacing cradles can be supplied.
The complete system requires a Timing Unit type 817 and Windows BallisticsDB software to provide a sophisticated Velocity Measurement system. The unit can also be used to measure rate of Fire for automatic weapons. The units provide remote gain control, light level and trigger monitoring of the 858.
As a projectile passes through the field of view of the Start and Stop Optical detectors, a small change in illumination is detected. This change is translated into an output pulse. The gain is remotely settable for a range of calibres. Incorporated within each Optical detector is an automatic gain control system, which compensates for ambient light changes.
A tracer shield can easily be fitted to the Optical detectors to enable velocity measurement on tracer rounds to be made.
Please refer to individual information leaflets for the detailed specifications of the system components: Optical Detector type 858, Remote timer unit type 817, Intelligent infra-red light source type 788, Computer Interface Unit type 570-070 and Range Processor type 663 or 663N.
BallisticsDB Control Software
The PVMS is controlled by a Range Processor / PC running the MS Instruments’ BallisticsDB control software. This software is used to control all instruments produced by the company and gives a common interface to simplify operation by the users. The version of BallisticsDB used for Velocity/Rate of Fire measurement is known as KINETIC.
A further variant of KINETIC is designed especially for users undertaking tests on ballistic materials. It has built-in functions for this purpose, including V50, Energy and drag calculations.