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 APPLICATIONS||REPRESENTATIVE MODELS|
|Weapons and rocket testing||7270A, 7280A, 7274, 136, 7250A|
|High shock data recorders||74, 75|
|Pyroshock testing||7255A, 7280A, 7280AM4, 7284|
|Fuze/safe and arm||72|
|Mechanical shock and impact||7270A, 7280A, 2255B, 2225M5A, 133|
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.
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 7255A, 7280A, 7280AM4 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.
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.