DESCRIPTION

The Micro Dosimeter (P/N UDOS001) is a compact hybrid microcircuit

which directly measures total ionizing dose (TID) absorbed by an

internal silicon test mass. The test mass simulates silicon die of

integrated circuits on-board a host spacecraft in critical mission

payloads and subsystems. By accurately measuring the energy

absorbed from electrons, protons, and gamma rays, an estimate of

the dose absorbed by other electronic devices on the same vehicle

can be made. The Micro Dosimeter can operate from a wide range

of power supply voltages. The accumulated dose is presented to

three cascaded dc linear outputs and one pseudo-logarithmic output

giving a dose resolution of 14 μrad(Si) and a measurement

range up to 40 krad(Si). These outputs are intended to

be directly connected to most analog-to-digital converters (ADCs)

or spacecraft housekeeping analog inputs (0-5V range), which

makes minimal demands on the host vehicle.

FEATURES/BENEFITS

• Enables routine monitoring of spacecraft radiation environment

• Custom microchip in a small footprint package which results in

significantly lower weight and power than alternative devices

• Can be mounted in multiple locations on spacecraft

• Correlates environmental models and ray-tracing analyses with

real in-flight measurements

• Provides total mission dose to aid in diagnosis of spacecraft

anomalies that result from changes in environmental fluxes

• Dosimeters can be integrated to standard spacecraft

housekeeping systems

• Measures up to 40 krad(Si)

• Mechanical dimensions: 1.4” x 1.0” x 0.040”

• 20 grams in weight

• 10 mA from 13 Vdc to 40 Vdc input

• Simple linear analog output

• Commercial Class H-equivalent screening available