Sa UNCLASSIFIER
ne axis to the secomd section,
ye
¢:
Pithin
long insert.
cont and third sections have an inside dianster of 3.875" end odmtain a
o nt axial electrode 1.25" in diameter.
The corona wire enters thd hemi-
fee
‘
-,
reatlal end of this electrode and is maintained teat by means of an/internal
me high voltage supply connects to this electrode (and the
wire)
arn a gaitable inmtulator, This dimensional configuration was selécted so
ost no corona is produced except in the wire section,
Lavras
o
bs
Mee
a
~ 8 : Vw
ke;
'
a Cri
Corona is produced at the wire
we fourth section contains an axial type of blower designed for aviation use,
wt never previously tested at stratospheric altitudes,
a sual]
pin ends of the assembly are fitted with butterfly valves operated ty
eter eounted on the external surface of the tube,
of the
The active portiohs
reting conditions ebout 170 pa at
a
KS
ccouUsS
wltege of this device is spproximately 2750 volts and it delivers urnler normal
1150 wolts.
This unit together
mith a
Thoor electrical impulse timer are conteinesd tn«pressurized container
a-Si:
Fie
the high voltage power supply uses a "vitran® (vibrater-transformer) pbperating
at aprimary voitage of 4.5 volts, The m-load rectified and filters D.C.
a
ba
() atacspheres air).
The circuit used is axtremely simple (Figurel2j.
A dual
tag on the timer operates ‘two sets of two mritches in accordance with the time
settings. The first cam is set to close switches B and Bl after theitine for
_ =
way
j er 4
Vave AB ComMiecr
precipitator are lined with 3 mil aluminum foil upon which the samplelis collected.
escent has elapsed, (Normally 2 hours}.
These switches actuate the
ve motor,
opening the valves, turning on the high voltage and starting the blower.
the set semplingtine (6 hours) at altitude has elapsed, the nor
itches A and A+
After
closed
are actuated, turning off the timer and power supp]y, and
teusing the valves to close (through a back contact on the switch, Al,
Mower is also turned off by switch Al. A back contact on the blowef
nay be used for cutting down the balloon load.
The
switch
Wer for the blower is obtained from a group of silver cells providing 12 volts
for 2 ampere hours, Under these conditions (altitude end voltage)
ree 100 cfm at altitude and consomes 1.25 amperes.
In 6 hours at
Ehe blower
200 cfm
at wit samples the required 1000 cubic msters. 44.5 volt 3 AH spt of
Vertes power the timer, H.Y. supply and valve motor.
wtbatteries and pressurised container are housed in an insulated qlusginum
‘inst. The precipitator assembly is spring sounted in a separste aluzinus
we frame.
The entire assembly incloding batteries ami cables weighs
‘ely 35 pounds,
.
approxi-
cglations indicate that within the range of dust particle sises qf interest,
ts oe M, the unit is 100% efficient. Due to the lack of time, efficiency
mrtotes not yet been made on this unit. Preparations are now begng made to
ret these tests under simlated conditions. The theory of electrostatic
Pitation and calculations based on this unit are contained in IppendixD .
Cl
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LOS 1064
00131986 035