Ultra-Fast All-Sky Imaging
Up to f/0.95 effective all-sky imaging through narrow-band interference filters.
Flexible Filter Configurations
Available with a 6- or 8-position filterwheel, or with a single-filter drawer.
Reliable and Safe Operation
A high-reliability capping shutter acts as a bright-light protection mechanism to protect filters from solar exposure during daytime.
Powered by Synopticx Software
The included GUI-based Synopticx automatic ephemerides-driven instrument control & data acquisition Windows software ensures a truly ‘turn-key’ solution. Linux instrument control software (command-line based imaging daemon) available upon request.
Field of View: In addition to the standard fisheye field-of-view (180°), a wide range of field-replaceable field-of-view modules are available, ranging from 8° to 90°. These can be useful for high spatio-temporal resolution studies and cross-scale investigations. Custom field-of-view modules can be provided, upon request.
Number of Filters: Keo Sentry scientific imagers can be configured with a single-filter drawer or a filter wheel with 6 or 8 filter positions. Keo Scientific’s filter wheels are robust and designed to operate reliably for 10+ years in the field. Interference filters are essentially etalons and thus performance is affected by ambient temperature. All Keo filter wheels are carefully temperature-stabilized to within ±0.1°C with internal trim heating (and optional cooler) for optimum filter performance.
Imaging Sensor: Sensor-head options include a range of “Scientific Grade” back-thinned EMCCDs and CCDs with quantum efficiencies better than 95% and maintenance-free thermoelectric cooling to -70°C or better. Sensors with deep-depletion or anti-fringing technologies eliminate or suppress “etaloning” effects in the NIR. CCDs are generally preferred for long-exposure airglow measurements, while EMCCDs are ideal for high temporal resolution auroral studies.
Specifications are highly configuration dependent, some pertinent technical specifications for typical configurations are below. Please contact Keo Scientific for specifications for configurations not listed here.
|
Sentry3 w/
1024 (13.3mm) Sensor |
Sentry4 w/
2048 (26.6mm) Sensor |
| Field of View |
8° |
30° |
180° |
15° |
30° |
180° |
| Angular Resolution (center of field) |
<0.01° |
<0.03° |
<0.2° |
<0.01° |
<0.02° |
<0.09° |
| Spatial Resolution (100km altitude @ zenith) |
<20 m |
<60 m |
~300 m |
<15 m |
<25 m |
~150 m |
| Effective f-number |
f/0.95 |
f/1.2 |
| Filter Diameter |
3 inches |
4 inches |
| Filter Positions |
1, 6, or 8 |
| Filter Switching Speed |
<1 sec between adjacent positions |
| Filter Thermal Stability1 |
±0.1°C |
| Minimum filter bandwidth (FWHM) |
2.0 nm |
1.8 nm |
| Capping Shutter Reliability |
>1,000,000 open/close cycles |
| Software |
Synopticx Data Acquisition and Control Software |
| Operating Environment |
0 C to +30 C, non-condensing |
| Dimensions (typical, L x W x H) |
Single Filter: 75 x 15 x 18 cm
Multi-Filter: 75 x 30 x 35 cm |
Single Filter: 85 x 18 x 21 cm
Multi-Filter: 85 x 40 x 42 cm |
| Weight |
Single Filter: 10 kg
Multi-Filter: 15 kg |
Single Filter: 14 kg
Multi-Filter: 20 kg |
