The procedure is defined for determining the uniformity of film plane illumination (field irradiance) of the Hasselblad cameras. The data source shall consist of photographs, with X-Y scans being taken for indication only. The accuracy requirement is 2.0%

George, C.

English

NASA Technical Reports Server

NASA CR-
/--// 7 7
TEST PROCEDURE FOR HASSELBLAD FIELD IRRADIANCE
NASA-CR-141776) TEST PROCEDURE FOR N75-22685
HASSELBLAD FIELD IRRADIANCE (Lockheed
Electronics Co.) 20 p BC $3.25 CSCL 14E
Unclas
G3/35 19471
Prepared By
Lockheed Electronics Company, Inc. & ,
Aerospace Systems Division 
-e 
-
Houston, Texas 
-;
Contract NAS-9-12200
For
CAMERA AND OPTICAL ENGINEERING DEPARTMENT
National Aeronautics and Space Administration
LYNDON B. JOHNSON SPACE CENTER
Houston, Texas
April 1975
LEC-5968
https://ntrs.nasa.gov/search.jsp?R=19750014613 2020-03-22T21:33:10+00:00Z
TECHNICAL REPORT.INDEX/ABSTRACT
(See instructions on reverse side.)
I. TITLI AND IilHT TITL 01O DOCUMF NT 2. J C NO.
TEST PROCEDURE FOR HASSELBLAD FIELD IRRADIANCE JSC-09629
. %"TrACTOR/ORt;ANIZATION NAME 4. CONTRACT OR GRANT NO.
LOCKHEED ELECTRONICS. COMPANY NAS-9-12200
. ONTRACTOR/ORIGINATOR DOCUMENT NO. I. PUBLICATION DATE (THIS ISSUE)
LEC-5968 APRIL 1975
7. ::litRINTY CLASSIFICATION 8. OPR (OFFICE OF PRIMARY RESPONSIfILITY)
UNCLASSIFIED FRED PEARCE
'LIMI TATION 10O. AUTHOR(S)
GOVIIINMrNT HAS UNLIMITE RI(:TS YES ONO CONNIE GEORGE
II NI, 'TAwTE LIMITATIONS AND AUTHORITY
)I. DOCUMENT CONTRACT REFERENCES 12. NARDWARE CONFIGURATION
A)Ilk lOin AKDOWN STRCTUIIR NO. I';Y TIM
NA NA
ONTRA' t T rI lIIIIIT NO. 1ill'Y TI M
NA NA
I L NO). AND RIVISION MAJOR EQUIPMENT GROUP
NA NA
DPL LINE ITEM NO.
NA
I" AI. TRACT
THIS DOCUMENT DEFINES THE PROCEDURE FOR DETERMINING THE UNIFORMITY
OF .FILM PLANE ILLUMINATION (FIELD IRRADIANCE) OF HASSELBLAD CAMERAS.
14. SUBJECT TERMS
ASTP
ERAP
JSC Form 833 (Rev Sep 74) NASA-JSC
.ISC-09629
PROJECT DOCUMENT COVER SHEET
TEST PROCEDURE
FOR
HASSEiLBLAD
FIELI) IRRADIANCE
REPORT NUMBER D
A T E
ED82-AC-662
PREPARED BY: C. George Approved: P. M. iffiths
(BRANCH AND/OR SUPPORT OFFICE)
APPROVED: ED/8 F. Pearce -- -
APPROVED: D/ Nf1. Kue el '
(PROGRAM OFFICE)
APPROVED: ND/5 D. Dittmar q
NO. OF PAGES
REVISIONS
DATE PREPARED BY APPROVALS CHG. LETTEI
$RANCH DIVISION PROGRAM OFFICE
0
C
JSC Form 151A (Jul 66) NASA-JSC
LEC-5968
N ASA- . IA i 01: i:i i
IOIUS:ITON TE'I'XAS DATE April 1975
TABLE OF CONTENTS
PARAGRAPH TITLE PAGE
1.0 PURPOSE. ......................................... 1
2. 0 APP ,ICATION ................................... 1
3.0 TEST, EQTIPMENT................................ 1
41.0 TEST PROCEDURI .................................. 1
4.1 Equipment Setup ............................... 1
4.2 Calibration Procedure ............................ 1
NASA- SC PAGE' ii OF_ ii
RIil'ORT ED82-AC-662
IIHOUSTON, TEXAS DATE Ari 1975
LIST OF FIGURES
NO. TITLE PAGE
3-1 FIELD IRRADIANCE TEST SETUP....................... 2
NAsA- JSC PAGJ j i.1 i i
I: D82-AC-662liPoROD82AC-  ouON, TEXAS DA'T'LI Apri 1 1975
LIST OF TABLES
NO. TITLE PAGE
4-1 DATA SHEET FOR FIELD IRRADIANCE
PART I- CHECKOUT ...... .......... ...... 5
PART I - EQUIPMIENT ID/DATA RECORDING... 11
NASA-JSC PAGE I1 OF 14
RE1PORT ED82-AC-662
HOUSTON, TEXAS DATE April 1975
1.0 PURPOSE
The purpose of this document is to define the procedure
for determining the uniformity of film plane illumination
(field irradiance) of the Hasselblad cameras.
The data source shall consist of photographs, with X-Y
scans being taken for indication only. The accuracy
requirement is 2.00.
2.0 APPLICATION
This document is applicable to all Hasselblad lens field
irradiance tests unless otherwise specified. All data
and comments are to be recorded on the Data Sheet, Part
II (see Table 4-1). All testing shall be verified by
Government inspection.
3.0 TEST EQUIPMENT
The following equipment is utilized in the determination
of field irradiance. (See Figure 3-1 for an illustration
of the test setup.)
* Photometer, Gamma Model 2020, S/N 793
0 Photomultiplier, Gamma Model 2020-1, S/N 784
* Automatic Photometer Scan, NASA No. 86684
oe Hasselblad Mounting Fixture
• Beck Hemisphere, S/N 002
* TL700 Research Radiometer, S/N 84
* Variac
* IL700 Detector, PT171C, S/N 86
* Power Source, NASA No. 36129 (DC Power Supply)
* Shutter Release Box
* Fiber Optic Probe with Cosine Adapter (.016" Salisbury
cap attached)
4..0 TEST PROCEDURE
4.1 Equipment Setup
4.1.1 Record test equipment and test article part number (P/N)
and/or serial number (S/N) on the Data Sheet, Part II.
4.1.2 Verify that test equipment is operational.
4.2 Calibration Procedure
4.2.1 Mount the camera and lens on the Hasselblad mounting
fixture.
i0
TO BE PROVIDED z >
c.
* r ?
jlFIGURE 3-1 FIELD I RADIANCE TEST SETUP
I,
FIGURE 3-I FIELD IRRADIANCE TEST SETUP
NASA-,JSC PAI 3- OF 14
HOUSTON 'TEXAS DAT'E Apr l 1975
4..2.2 Verify that the mounting fixture is in correct orientation
(i.e., the b'ottom thumbscrews shall be all the way up so
that the camera is vertical).
4.2.3 Set Variac to re.quired voltage. Ver-ify with the 1L700
photometer. Record data on the Data Sheet.
4.2.4 Open the camera shutter.
4.2.5 Put the X-Y scanner into manual control and check the
X-Y scan plane manually.
NOT: TH'I MAIN DATA SOURCE CONSISTS OF
PHOTOGRAPIIS. THE X-Y SCAN TS FOR
INDICATION ONLY.
4.2.6 With the X-Y scanner in manual control, define the
following:
* X-start position
* Increment size of X
* Number of increments in X
* Y-start position
* Increment size of Y
* Number of increments in Y
Record information on Data Sheet, Part I.
4.2.7 Ch'cck for photometer and set it to a range of 100 + 5
by varying the HV adjust.
4.2.8 Set F/number to the largest aperture. Record on Data
Sheet, Part I.
4.2.9 Run X-Y scan as per the parameters derived in Paragraph
4.2.6.
4.2.10 Repeat Step 4.2.6 for the center veritcal scan of film plane.
4.2.11 Remove fiber probe assembly and install magazine con-
taining type 3400 film.
4.2.12 Turn off scanner and close camera shutter.
4.2.13 Set the camera to the largest f/number (smallest numerical
setting). Record on Data Sheet, Part I.
4.2.14 Set exposure time to matrix value for largest f/number
(smallest numerical setting). Record on Data Sheet,
Part I.
NASA-.SC PA;E 4 F 14
IOIPORT ED82-AC-662
HOUSTON, TEXAS. DATI April 1975
4.2.15 Open the camera shutter.
4.:2.16 Take three data frames and blank two.
4.2.17 Set the lens to the next f/number until all f/numbers
below f/16 have been completed. Record on Data Sheet,
Part I. When all f/numbers below f/16 have been com-
pleted, go to Paragraph 4.2.19.
4.2.18 Repeat Paragraphs 4.2.14 through 4.2.17.
4.2.19 Place the second lens on the camera and repeat Para-
graphs 4.2.13 and all following steps. With the second
lens on the camera, repeat Paragraphs 4.2.2 through
4.2.10.
4.2.20 Turn off all test equipment.
4.2.21 Remove Hasselblad camera from calibration setup.
NASA-JSC PAGE 5 OF 14
iEPOR'r ED82-AC-662 HOUSTON, TEXAS 
DATE ~pri 1975
TABLE 4-1
DATA SHEET FOR
FIELD IRRADIANCE
PART I - CHECKOUT
PARA DESCRIPT ION INSPECTIONREF
4.1.1 P/N's and/or S/N's of the test equipment recorded
on Part II of the Data Sheet
4.1.2 Equipment is operational.
4.2.1 Camera and lens are mounted on the Hasselblad
mounting fixture.
4.2.2 The Hasselblad mounting fixture is in correct
orientation (i.e., the camera is vertical).
4.2.3 The Variac is set to the following voltage and
verified with the IL700 photometer
4.2.4 The camera shutter is open.
4.2.5 The X-Y scanner is in manual control.
The X-Y scan plane is checked manually.
4.2.6 The X-Y scanner is in manual control.
The following are defined:
9 X-start position:
* Increment size of X:
* Number of increments in X:
9 Y-start position:
* Increment size of Y:
* Number of increments in Y:
4.2.7 The photometer is checked and set to a range of
100 +5 by varying the HV adjust.
NASA-JSC PAGIi 6 O 14
REPORT ED82-AC-662 HOUSTON, TEXAS IATE April 197
TABLE 4-1 (CONT'D)
PART I - CHECKOUT
PARA DESCRIPTION INSPIECI 1ON
RE F
4.2.8 The f/number is set to the largest aperture as
follows:
4.2.9 The X-Y scan is run using the parameters defined
in Paragraph 4.2..6 of the Data Sheet, Part I.
4.2.10 Repeat Step 4.2.6 for the center verical scan of
film plane.
4.2.11 The fiber probe assembly is removed.
Magazine containing type 3400 file is installed.
4.2.12 Scanner is turned off.
Camera shutter is closed.
4.2.13 The f/number is set to the largest f/number
(smallest numerical setting) as follows:
4.2.14 Exposure time is set to matrix value for largest
f/number (smallest numerical setting) as follows:
4.2.15 The camera shutter is open.
4.2.16 Three data frames are taken.
Two data frames are blanked.
NASA-,) SC I'AGF- 7 OF ... 4
REPIORT ED82-AC-662 OIIUSTON, TEXAS DATE April 1975
TABLE 4-1 -(CONT'D)
PART I - CHECKOUT
PARA DESCRIPTION INSPECTION
RE F
4.2. 1 The lens is set to the next f/number until 1ll
f/numbers below f/16 are completed. The f/numbers
used are as follows:
Upon completing all f/numbers below f/16, the
steps in Paragraph 4.2.19 are performed.
4.2.18 Steps in Paragraph 4.2.14 through 4.2.17 are
performed as follows:
A. Paragraph 4.2.14. Exposure time is set to
matrix value for largest (smallest numerical
setting) f/number as follows:
0.
B. Paragraph 4.2.15. The camera shutter is
open.
C. Paragraph 4.2.16. Three data frames are
taken. Two data frames are blanked.
D. Paragraph 4.2.17. The lens is set to the
next f/number until all f/numbers below
f/16 are completed. The f/numbers used are
as follows:
NASA -.JSC PAGE 8 OF 14
RIPORT ED82-AC-662 HOUSTON, TEXAS DATE April 1975
TABLE 4-1 - (CONT'D)
PART I CHECKOUT
PIARA DESCRIPTION INSPECTION
R E, F
4.2.19 The second lens is placed on the camera and steps
described in Paragraphs 4.2.13 through 4.2.17j are
performed.
A. Paragraph 4.2.13.. The f/number is set to the
largest f/number (smallest numerical setting)
as follows:
B. Paragraph 4.2.14. Exposure time is set to
matrix value for largest f/number (smallest
numerical setting) as follows:
C. Paragraph 4.2.15. The camera shutter is open.
D. Paragraph 4.2.16. Three data frames are taken.
Two data frames are blanked.
Fi. Paragraph 4.2.17. The lens is set to the next
T7number until all f/numbers below f/16 have
been used. The f/numbers used are as follows:
If.the second lens is already on the .camera,
the steps described in Paragraphs 4.2.2 through
4.2.10 are performed as follows:
NASA-JSC PAG3 9 01 1 4
I ORT I 82-A ..... JOST'ON, ''T XAS DATE__.pr _j. 97
TABLE 4-1 (CONT'D)
PART I- CHECKOUT
PARA D1SCR. PT ION I NSPECTION
4.2.19 1. Paragraph 4.2..2. The Hasselblad mounting
(Contid) 7ixture is in correct orientation (i.e.,
the camera is vertical).
2. Paragraph 4.2.3. The Variac is set to the
following voltage and verified with the
1L700 photometer.
3. Paragraph 4.2.4. The camera shutter is open
4. Paragraph 4.2.5. The X-Y scanner is in
manual control.
The X-Y scanner is checked manually.
5. Paragraph 4.2.6. The X-Y scanner is in
manual control.
The following are defined:.
e X-start position:
* Increment size of X:
* Number of increments in X:
* Y-start position:
* Increment size of Y:
* Number of increments in Y:
6. Paragraph 4.2.7. -The photometer is checked
and set to a range 6f 100 +5 by varying the
llV adjust.
7. Paragraph 4.2.8. The f/number is set to the
largest aperture as follows:
NASA-JSC, PAGE 1 :  "14'
REPORT ED82-AC-662 HOULSTON, TEXAS DATE April 1975 .
TABLE 4-1 (CONT'D)
PART I- CHECKOUT
'ARA DIESCRIPT ION INS C '1 TION
4.2.19 8. Paragraph 4.2.9. The X-Y scan is run using
(Cont'd) the parameters defined in Paragraph 4.2.6
*of the data sheet.
9. Paragraph 4.2.10. Repeat Step 4.2.6 for
the center vertical scan of film plane.
4.2.20 All test equipment is turned off.
4.2.21 Hasselblad camera is removed from calibration
setup.
PARA ADDITIONAL STEPS REQUIRED BY TPS INSPECTION
REF (WHERE APPLICABLE)
NASA-JSC PAGE 11 OF 14
REPORT ED82-AC-662
HOUSTON, TEXAS DATE April 1975
TABLE 4-1 (CONT'D)
PART IIT - EQUIPMENT TD/DATA RECORDITNG
TEST EQUIPMENT S/N P/N TEST ARTICLE S/N P/N
Photometer, Gamma
Model 2020
Photomultiplier,
Gamma Model 2020-1
Automatic Photometer
U Scan, NASA No. 86684
Hasselblad Mounting
) Fixture
Beck Hemisphere
IL700 Research
Radiometer
Variac
IL700 Detector,
PT171C
IPower Source, NASA
W No. 36129
_ 
Shutter Release.Box
Fiber Optic Probe
with Cosine Adapter
U (cap attached)
NO. ADDITIONAL INFORMATION
1. IL700 CHECK OF. HEMISPHERE
9 Variac set at volts
* IL700
---Function
---Suppression
---Range
NASA-.JSC PAGE 12 OF 14
REPORT' ED82-AC-662
HOUSTON, TEXAS IDATI" April 1975
TAIHI -I ( CONT' I))
PART II - EQUIPMENT ID/DATA RECOPDING
NO. ADDITIONAL INFORMATION
1. -- Sensitivity factor
ont 'dontd Variac I700 x 10
NO. REMARKS
NAS;A- J,;C ,A ,_ 13 0 -1 4.
REPORT .1i82-AC-662
HOUSTON, TEXAS DATE April 1975
TABLE 4-1 (CONT'D)
PART II - lQUIPMENT ID/DATA RECORDING
TEST EQUIPMENT S/N P/N TEST ARTICLE S/N P/N
Photomcter, Gamma
Model. 2020
Photomultiplier,
Gamma Model 2020-1
Automatic Photometer
u Scan, NASA No. 86684
llassclblad Mounting
(n Fixture
Beck Hemisphere
11,700 Research
Radiometer
Variac
1L700 Detector,
PT171. C
Power Source,. NASA
No. 36129.
Shutte.r Release Box
Fiber Optic Probe
with Cosine Adapter
(cap attached)
NO. ADDITIONAL INF:ORIiATION
1. 1L700 CHlECK OF HEMISPHERE
* Variac set at volts
* 11,700
--- Function
--- Suppression
--- Range
NASA-JSC PAG.i 14 OF 14
RPiORT _EDie2 IOUST'ON, 'I'XAJS ]) DJATE April 1975
TABLE 4 - 1. (CONT' D)
PART II - EQUIPMENT ID/DATA RECORDING
NO. ADDITIONAL INFORMATION
1. -- Sensitivity' factor
ont'!-9ont Variac IL700 x 1.0
NO. REMARKS


Test procedure for Hasselblad field irradiance

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