Weapons

Endevco accelerometers are the industry standard for high g shock measurement.  These accelerometers are small, lightweight, easy to install and can take shocks up to 200,000g’s.  Our piezoresistive shock accelerometers are essential in measuring accurate Shock Response Spectrum.  As a result, they are frequently specified for applications involving weapons testing, explosions and missile penetration studies.

TYPICAL APPLICATIONSREPRESENTATIVE MODELS
Weapons and rocket testing7270A, 7280A, 7274, 136, 7250A
High shock data recorders74, 75
Pyroshock testing7255A, 7280A, 7280AM4, 7284
Fuze/safe and arm72
Mechanical shock and impact7270A, 7280A, 2255B, 2225M5A, 133
Blast testing8511A

Application considerations

High shock data recorders

Data recorders for military weapons testing typically require accelerometers with both high g ranges and high sampling rates. The sensors must be easily mounted in a small package and integrated with the recording device.  The Model 75 family of triaxial accelerometers features three sensors in a mutually orthogonal arrangement in a leadless chip carrier (LCC) package that supports mounting by surface mount technology (SMT), re-flow soldering (with epoxy underfil) or adhesive mounting (with hand soldering).  For each axis, the sensor is sculptured from a single chip of silicon, which includes the inertial mass and strain gauges arranged in a four-active-arm Wheatstone bridge circuit.

Pyroshock testing

There are several different pyroshock standards but a common one derived from MIL-STD-810G, Method 517 for near-field pyroshock has frequencies greater than 10,000 Hz and peak amplitudes greater than 10,000 G’s.  The 7255A7280A7280AM4 and  7284 accelerometers are all near-field accelerometers characterized by different packaging.  The miniature, tubular-shaped, piezoelectric 7255A has an integral stud for mounting.  The flat, low profile piezoresistive 7280A has two holes for screw mounting while 7280AM4 is hexagon-shaped and stud mounted.  The higher profile, rectangular-shaped 7284 is a triaxial accelerometer.

Blast testing

Miniature pressure sensors are used for studies of structural loading by shock waves resulting from blast explosions. The model  8511A piezoresistive pressure transducer has a 3/8-inch mounting thread and is available in ranges from 5000 to 20 000 psig. For harsh environments, where there is particle impingement, an optional version is available with a protective screen and a black silicone grease coating which further reduces photoflash sensitivity and provides an effective thermal barrier for short duration, high temperature service. Recommended electronics for signal conditioning and power supply are the model 126 and 136 general purpose three channel conditioners.

Related topics

The future of Meggitt-Endevco silicon pressure transducers

Appropriate sampling rate for shock measurements.

Reducing unwanted high frequency acceleration inputs

Sensor features that may be critical in weapons testing

  • Damped or undamped versions
  • Minimal zero shift after shock
  • High over range and survivability
  • SMT versions for embedded applications
  • Low power consumption