SPECTROPHOTOMETER FAGOT

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SPECTROPHOTOMETER FAGOT
SPECTROPHOTOMETER FAGOT

Measurement principle

The satellite spectrophotometer FAGOT is designed for measurement of intensity of night ionosphere emissions in spectral range of 420-900 nm and their height distribution within interval of 50-200 km.

There is an additional zenith photometer channel for measurement of emissions formed heights more than 500 km to take into account the processes connected with solar activity and high layers of ionosphere.

Experiment configuration and heritage

Spectrophotometer is made up of the four units:

1. Photometer BP-1

2. Photometer BP-2

3. Spectrometer BP-3

4. Data processing unit (BE) placed in hermetic volume.

Direction of optical axis:

Photometers: BP-1 - to zenith, BP-2 - to nadir.

Spectrometer: Limb channel at angle 18 deg to satellite velocity vector in the plane «velocity vector-nadir», scanning takes place within +5 - -30 deg to optic axis in the plane «velocity vector-nadir»;

Nadir channel: nadir, scanning takes place within ± 20 deg to optic axis in the plane with perpendicular «velocity vector»; Flat scanning mirror is used to measure spatial distributions of emissions intensity in direction perpendicular to the vehicle orbit track.

Each photometer and spectrometer incorporates a sensor that autocomally shuts down the photometer when the sun (or other light sours) enters the 10 deg field of view of the sensor, the restricted field of view the photometer and spectrometer.

The photometer has flown twice (APEX). The electronics will be upgraded for WARNING.

Main characteristics of the instrument

Table provides the main interface data and characteristics.

Photometers BP-1 and BP-2:
sizes (of each) Æ 120 x 550 mm
mass £ 3 kg
power voltage 24 V
current £ 0.2 A
optics: diameters 72 mm, Focal length 360 mm
field of view 5 deg (maximum)
dynamic range 65535
integration period 1, 2, 4, and 8 s
photometric sensitivity > 15 counts/(sR) (l =630 nm)
optical filters 4 selectable

BP-1 (zenith) [OI] - 630 nm, H alpha - 656.3 nm, background

BP-2 (nadir) [OI] - 557.7, 630 nm, O2 - 761.9 nm, background

Unit of spectrometer BP-3:

sizes 500x150x150 mm
mass 13 kg
power voltage 22 -34 V
current £ 1.5 A
time integration 0.1, 0.4, 1, 2, 4, 8 s
time resolution 1; 2; 4; 8 s
spectral resolution 500

	limb channel		nadir channel
effective area input optics Aef, sq. cm	70	8
field of view W, deg	1.5 x 1.5	5 x 5
geometric factor, sq. cm sr.(Aef W)	4
spectral range, nm	420 - 780	420 - 700, 700 - 900
spatial resolution, km, for point altitude 100 km vertical x horizontal	2.5 x 65	50 x 5

Unit of electronics BE:

sizes 215x180x120 mm
mass £ 3 kg
power voltage 22 -34 V
current £ 0.4 A

For data transmission, it is need 10 channels of digital telemetry, 10 channels of analog telemetry, 6 channels of the temperature measurement system and 2-channel fast telemetry with rate 350 KBPS.

V.N.Ivchenko ivchenko@astrophys.ups.kiev.ua
V.P.Lapchuk lapchuk@astrophys.ups.kiev.ua

More details in: PROCEEDING OF SPIE 23^RD European Meeting on Atmosheric Studies by Optical Methods, 2-6 September 1996, Kiev, Ukraine, vol. 3237

V.N.Ivchenko, V.P.Lapchuk // Optical measurements in the project "Poperedzhennya" (WARNING) // pp.44-49.

Osipov S.I., Lapchuk V.P. // Laboratory model of static Fourier spectrometer for investigation of atmospheric emissions // pp.158-161.