EMI
test of the system at the EMI test facility of Oerlikon-Contraves. The
persons on the photograph are (from left to right): Peter Dias-Lalcaca
(ECO PHYSICS), Christian Dittmar (ETH), Walter Imfeld (ECO PHYSICS) and
Dominik Brunner (ETH).
EMI
test of the system at the EMI test facility of Oerlikon-Contraves. The
persons on the photograph are (from left to right): Peter Dias-Lalcaca
(ECO PHYSICS), Christian Dittmar (ETH), Walter Imfeld (ECO PHYSICS) and
Dominik Brunner (ETH).
View
of the open rack. Two NO sensors are placed in the lower right rack compartment.
The ozone analyser and the photolytic converter which converts NO2 to NO
with an efficiency of 70% in 2.5 sec are placed above in the medium compartment.
A pure air generator and a calibrator instrument are mounted on the top
shelf. The components on the left hand side are the pumps, power converters,
electronics and the computer, which governs the fully automated operation
of the system including automatic start-ups/shut-downs and calibrations.
After
extensive tests at ECO PHYSICS, the system was transported to SWISSAIR
for an additional on-ground EMI test and for checking the mechanical and
electrical connections with the aircraft. The system was finally approved
for a one-year continuous operation on the aircraft.
View
of the rack in front of a jet engine and the B-747 (on the left).
The rack dimensions are about (LxWxH) 2x1x1.2m excluding the fans
on either side of the rack used for dissipation of the 6 kW consumed by
the system. The total weight is 580kg.
Installation
of the system on May 5 1995 in the back of the large cargo-compartment.
The rack was mounted to the floor like an ordinary cargo palette. The placement
of the rack in the back allowed to access the system from all sides which
proved to be important for doing maintenance work.
View
of the probe extending 9" from the surface into the airstream to avoid
contamination from the aircraft body. The probe is made of aluminium with
a Teflon core. Air was sampled from the reverse to minimise contamination
by aerosols, insects, etc. The probe was located sufficiently far asway
from the engines such that contamination by the exhaust air could be excluded.
