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A simple photometer

First, consider a very simple 1-channel UBV photometer. Let us assume a rather minimal instrument: no cooling or temperature regulation, and simple DC photometry. This resembles the instrument with which the UBV system was first set up. Here is the table:


 
Table: Instrument table file for a simple photometer

Descriptor values:

NFILTCAR = 1

NDETS = 1

FILTSTAT = DOME

FILTCAT = ' ' (blank string)

CONDITION = AVERAGE

Passband sub-table
NBAND BAND FILTCODE_1 REDLEAK RLTYPE MAKER
--- -- ----- ---- --- ----
1 U 3 MEASURED LOOSE CORNING
2 B 1 IGNORED    
3 V 2 ABSENT    
4 URL 4 ABSENT    

Detector sub-table
NDET DET SNUMBER MODE COOLING
-- -- ---- -- ----
1 PMT S-4 DC NONE

 

As there is only one detector, we need not include the NDETUSED column.


 
Table: Instrument table file for a typical modern photometer
Descriptor values:

NFILTCAR = 2

NDETS = 1

FILTSTAT = DOME

FILTCAT = ' ' (blank string)

CONDITION = AVERAGE

Passband sub-table
NBAND BAND FILTCODE_1 FILTCODE_2 NDVALUE REDLEAK RLTYPE MAKER
--- -- ----- ----- ---- ---- ---- ---
1 u 10 0 1.000 MEASURED CEMENTED SCHOTT
2 v 20 0 1.000 BLOCKED    
3 b 30 0 1.000 BLOCKED    
4 y 40 0 1.000 BLOCKED    
5 uND 11 0 9.897 MEASURED CEMENTED SCHOTT
6 vND 21 0 9.763 BLOCKED    
7 bND 31 0 9.674 BLOCKED    
8 yND 41 0 9.695 BLOCKED    
9 DARK any 1        

Detector sub-table
NDET DET SNUMBER MODE DEADTYPE DEADTIME DEADTIMEERROR COOLING DETTEMP
-- -- ---- -- ----- ---- ------- ----- ----
1 PMT QBIALKAI PC EXTENDING 6.74E-8 4.2E-9 REGULATED 273.

 


next up previous contents
Next: A modern single-channel photometer Up: Sample instrument files Previous: Sample instrument files
Petra Nass
1999-06-15