Delta Velocity Accelerometer

Custom Precision Accelerometer Packages

Space-Qualified Linear Sensor Packages View .pdf format.

A custom precision accelerometer package measures low linear acceleration on satellites or other precision platforms. The package provides simultaneous acceleration signals along three orthogonal axes with a commendable dual range of +/- 25mG and +/-1000mG over a 16Hz bandwidth.

Two independent sensor sets (dual redundant) are provided in a single enclosure. The unit provides pulse train outputs with frequency proportional to acceleration, and temperature sensor outputs with voltage proportional to temperature. All inputs and outputs are dual redundant. Separate connectors are used for power and signal connections. A bias input is provided to offset earth G bias in the sensitive range for ground testing and a calibration signal is provided internally for on-orbit two point scale factor calibration.

Dynamic
Two Commandable Ranges	± 1000 mG FS and ± 25 mG FS
Output Scaling (Freq Output)	-FSmG = 100Hz, 0mG = 5.859mG + FSmG = 11.681mG
Scale Factor Stability	< 1000 ppm
Non-linearity	< 1000 ppm
SF Temperature Stability	< 150 ppm / ºC
Frequency Response	0 Hz - 16 Hz with 2nd order roll-off above 16 Hz
Output Bias	< 5 mG
Output Noise	< 2 mG rms
Electrical
Power Consumption	< 35 W per side (at 30 VDC nominal)
Commands	Separate On/Off commands via 40 msec pulse
Status	All commands have status feedback
Telemetry	Temperature telemetry is provided
Mechanical
Size	Approx 175 mm x 175 mm x 175 mm
Weight	< 7 kg
Sensor Misalignment	< 1800 arc-seconds
Environmental
Temperature Limits	-20ºC to +66ºC
Pressure Limits	< 10^-5 Torr
Input Voltage Limits	0 VDC-40 VDC w/no harm to unit (30 VDC nominal)