3.2 Optical Testing System (OTS)
OTS, it has collimators with various focus
lengths and auxiliaries, standard plane mirror,
and moving target simulator. The integrated
wave-front aberration of collimate (p-v value)
£ l/8. The internal thermal control system of
collimate guarantees the temperature
differential of the points
£0.5
°C. Combining
with TVS, it is used to test the functional
performance of optical remote sensor under
normal temperature, normal air pressure, and
the environmental condition similar to
satellite orbit. There for, the DETS can be
used to do heat vacuum, heat balance, heat
circulation tests as well as vacuum calibration
experiment, and to measure the static and
dynamic photographic resolution of remote
sensor, and MTF of optical system. Through
analysis of these experiments, the actual
functional performance of the remote sensor
in orbit flying, ground resolution for example,
will be predetermined rather precisely.
3.3 Vibration Isolation System (VIS)
VIS is used to isolate ground vibration caused
by people activities (such as moving of
vehicle, operation of construction site,
running of machine etc.), ensuring normal
optical testing. The VIS consists of vibration-isolation
base, and air spring vibration-
isolation platform. The platform is 23m long
and 4.5m wide, adopting 28 large air springs
to suspending it. All the experimental
apparatus and experimental object are placed
on this platform. Under control of operation
desk, the platform suspends total mass of
hundreds tons of tested objects and
experimental equipment, isolating them from
ground. The platform is the domestically
developed one with the largest dimensions
and comparatively good performances.
4 Distinguishing features of DETS
Combining optical testing apparatus (long
focus length collimator etc.) with space
environment simulator, to fulfill the task of
performance test of remote sensor under
orbital environment condition.
Out fitting a complete high precision optical
testing equipment, getting rid of air fluttering
and convection in the testing optical path.
Uniformity of temperature field, small
temperature gradient, and very low organic
volatilization pollution.
A perfect micro-vibration isolation system.
The whole system fits up all kinds of
necessary equipment, having good potential
application. Not only carry out remote sensor
experiment but also realize space
environment experiment for middle or small
earth observation satellite.
5 Function of DETS
Simulation experiment (heat balance, heat
vacuum, heat circulation etc.) of space emote
sensor under simulated orbital working
condition and integrated performance test,
static and dynamic resolution measurement
and MTF measurement.
Adjusting parameters of remote sensor
according to orbital working condition of
satellite (especially doing vacuum focus
calibration)to reach the good match.
Fulfill environmental simulation for middle
or small satellite.
The successfully development and operation
of the Dynamic Environment Testing System
will further the development of Chinese
space remote sensing technology.
