The neutral gas mass spectrometer on the Induced Environment Contamination Monitor is described. The results of the measurements are presented

Carignan, G. R.

English

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NEUTRAL GAS MASS SPECTROMETER ON THE IECM 
G. R. Carignan 
University of Michigan 
1 Preceding page blank 
A-139 
https://ntrs.nasa.gov/search.jsp?R=19830014030 2020-03-21T04:38:32+00:00Z

N E U T R A L  G A S  M A S S  S P E C T R O M E T E R  
O N  T H E  I E C N  
G. R. C A R I G N A N  
1. INSTRUEENT DESCRIPTION 
2 .  GEOMETRY OF THE IIEASUREMEHT 
3.  C A P A B I L I T I E S  AND L IMITATIONS 
4. RESULTS 
A. WATER 
B. METHANE 
C, ATMOSPHERIC GASES 
D. HEAVY MOLECULES 
E. THRUSTER FIRINGS 
F. DOOR CLOSINGS 
G. GAS CALIBRATION 
5, CONCLUSIONS 
6. FUTURE A C T I V I T I E S  
c 4 
4 
FUNCI IONAC 01AGRALI OF Ill€ H A S S  SPECIROMCTER 
4, Preceding page blank c 
I 
A-141 
IECM WITH MASS SPECTROHETER I S  THE LARGE 
TOP MOUNTED BOX I N  THE RIGHT-CENTER OF 
THE PHOTO. 
A-142 
ms/2 SEC. 1 1 ~  IO' - 
Id t 
c 
SPECTRUM TAKEN BY THE MASS SPECTROMETER ON STS-2  A 1  
1 3  HRS. 7 5  M I N .  MET. 
ENVELWE OF 
MET 
E N V E L O P E  OF H 0 COUNT R A T E  OVER THE D U R A T I O N  OF 
THE F L I G H T  OF'STS-V. 
ARE STRONGLY MODULATED B Y  THE l N S T R U M E N r  A N G L E  OF 
A T T A C K .  
THE V A ~ S Y I l H I N  T H E  E N V E L O P E  
A-143 
FLUX 
FOR A NOMINAL SCATTERING CROSS SECTION 
COLUMN DENS I TY 
TIME CONSTANT FOR DECREASE TO 1/E 
H 2 0  O N  S T S - 4  
MAX I MUM SOURCE DENS I TY 2.5 x lo8 CC-' 
INTERPRETED AS A 
2 , 1  x 1014 CM-2 SR-1 s-1 
V A R I A T I O N  I N  MEASURE0 HELIUM A N 0  ARGON AS INSTRUMENT 
ANGLE OF ATTACK VARIES FROM 171)' TO 10.. THE 
ATMOSPHERIC OEMSITIES OBTAINED FROM MANY SUCH OBSER- 
V A T I O N S  ON STS-Z.  S T S - 3  AND STS-'4 AGREE YELL W I T H  
MODEL VALUES. 
A-144 
S T S - 3  A T  4 9  H R S  M E T  
A M B I E N T  D E N S I T I E S  
ARGON 
HELIUM 
MEASURED 
1,2 105 CC-1 
3,O x lo6 CC-’ 
NIDEL (260) 
1.7 105 CC-1 
5,4 x 106 cc-3 
79poo I I I I I I I I I I 
OFFEKNnAL STS - 4 
COIPOSITUN 
47: 16 122.1 
60.,000 - AT 
I I I I  
I TRACE \ 40.000 - “H3 I coz 
30,000 
10.00 
MET 
T Y P I C A L  SIGNATURE OF A V E R N I E R  RCS F I R I N G .  METHANE I S  B E L I E V E D  
TO BE A R T I F I C A L L Y  PRODUCED ON THE Z I R C O N I U M  O X I D E  GETTERS OF THE 
COLLIMATOR. N I T R O G E N ,  WATER AND HYDROGEN ARE THE P R I N C I P A L  
PRODUCTS OBSERVED. 
A-145 
4 
I I I I 
l d 4 0  ‘L’ 0 ‘ IO 2 0  30 40 10 
HRS 166 16’ MET 
PRESSURE R I S E  AN0 THE C O M P O S I T I O N  I N  THE 
PAYLOAO BAY D U R I N G  THE DOOR C L O S I N G  E X E R C I S E  
AT lb7 HOURS MET ON 5 1 5 - 3 .  
22 ISOTOPE OF NEON DOMINATES THE SPECSRIH. THE ISOTOPICMLY LMELEO 
WATER AT MASS 20 WICH WAS RELEASE0 SIWLTu(E0VzLI  IS NOT SEEN- THE 
MASS 20 AN0 21 COVIT RATES ARE CONSISTENT WITH THE P l R l f Y  OF THE, 
NEON-22 WS 1040- 
A-146 


Neutral gas mass spectrometer on the IECM

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