Mini Digital HCI

Mini Digital HCI image

Overview

The Mini Digital HCI was originally developed for use on sounding rockets for Sandia National Laboratories then modified to provide either an analog or a digital output for NASA’s Wallops Test Range. The sensor consists of a Lithium Tantalate pyroelectric detector mounted in an aluminum housing. The detector element is 0.75 mm square configured in a current mode circuit. The circuit consists of the pyroelectric crystal connected to an Op-Amp with a shaping circuit to limit low frequency circuit noise and a uP with A/D converter to digitize the signal and perform a rate of change calculation on the data.


The processing in the imbedded software produces a digital pulse output that corresponds to the center of the IR horizon. This technique provides for a consistent output that is independent of spin rate or temperature or detector output variations. The unit contains a narrow band IR filter designed for use at 15um. An A/R coated Germanium lens is incorporated to provide a 3 deg FOV.

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Overview

Name
Mini Digital HCI
Vendor
Servo
Component Type
Earth/Horizon Sensor
Form Factor
CubeSat
Heritage
Yes

Vendor Details

Name
Servo
Founded
1984

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Specifications

Component Type
Earth/Horizon Sensor
Form Factor
CubeSat
Vendor
Servo
Dry Mass
0.05 kg
Average Power
0.084 W
Heritage
Yes
Status
In Production
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