precision filter radiometer sovim observatory davos world radiation centersafety workshop 6&7...

Precision Filter RadiometerSOVIM

Observatory Davos World Radiation Center Safety Workshop 6&7 Feb. 03 ESTEC

SOVIM Presentation1. Structures

1. Description Structural Subsystem2. Verification (FEM, Vibr, Analysis)

2. Pressurized System (n.a. SOVIM)3. Material flammability, toxicity and compatibility

1. List of toxic materials (n.a.)2. Final materials compatibility status (n.a.)3. Material List

4. Non-ionizing radiation5. Electrical subsystem

1. Power distribution schematics2. Verification

6. Avionics Control1. Schematics of safety critical subsystems2. Summary of test results etc.

7. Mechanism in critical application1. Summary of all mechanism2. Reports of verification etc.

8. Batteries (n.a.)9. Sealed Containers (n.a.)



2 Valves

DPU

2 Sunphotom.

3 Radiometers

TASS (black)

Heatsink

Thermal Washer

Sun Shield

DIARAD Electronics

2 Valves

Cover Plate(Cover Mechanismnot shown)

DIARAD Sensor

Not shown:Cover mechanismDC/DC, all PCB‘s

1.1 Package



1.1 Package

Connector flange

Instrument Slots

Mounting Feet



1.1 PMO6-V Radiometer

SOVIM has three PMO6Radiometer integrated. Two are PMO6V types, one is an older PMO6R type. The V-type is the same as we flown on SOHO, the R-type is the same as on SOVA.

Safety critical parts: Nothing!

Shutter

(the only rotating mass on Radiometer 3.6g)

Shutter Acutator

Printed CircuitBoards

Precision Aperture

Muffler

Hall Elements

Cavity

Connector



1.1 PMO6-R Radiometer

The R-type is very similar to the V-Type and is an EURECA reflight instrument.



1.1 SunphotometerPrinted CircuitBoards Connector

Purging stub

Precision Aperture

Glass Filters

Photo Diode

SOVIM has two three channel SPM integrated. This SPM is more or less the same as we flown on EURECA.

Safety critical:Glass filters. This small piece of glass is wraped on all side. In front is the precision aperture with a diameter of 2mm!



1.1 Two Axis Sun Sensor

The SOVIM flight TASS is the flight TASS of EURECA.

Linear CCD‘s

ConnectorSlit Aperture

PCB‘s not shown

Quartz Protective Window



1.1 DIARAD Sensor and Electronics

The DIARAD is also an „EURECA reflight“ instrument, with a few modifications.

Shutter Wheels



1.1 Sun-Shield

View from sun-side

Covered with BSM

View from package side



1.1 DPUUIM 3

User Interface Module 3

UIM 2


UIM 1


CPU

Central Processing Unit

SIM

Space Craft Interface Module

TIM

Timing ModuleEURECA „reflight DPU“

SOVIM


1.2 Sovim Instrument FEM Analysis Report

Conclusions of FEM (SOV-CSZ-RP-1001 / 18.12.02)

The drawings at PMOD are updated with all modifications proposed by CSAG. The results from the final analyses presented in section 6 (Analysis Results) show that the optimised SOVIM Package design is sound. The first frequency of vibration is above 220Hz.The results from the simple stress analysis presented in section 6.2.2 (Results from Static Analysis) show, that no obvious stress problems exist with the present design.Mode Number Frequency (Hz) Describtion

1 217.6

Vertical PCB Bending(both Plates bend in same Direction)

2 233.7Box Rocking in Z-Direction

3 239.5

Vertical PCB Bending(both plates bend in opponent direction)

4 263.7 Radiation Shield Bending

Mode Shapes of Modal Analysis for optimised Sovim Package



1.2 Structural Verifaction

•In parallel with the mechanical design, a structural analysis (FEM) has been done to asses strength compliance and dynamic behavior (first resonance frequency). See Contraves document SOV-CSZ-RP-1001, Issue 3, 18/12/2002.

•Validation of the FEM model and confirmation of compliance shall be done through vibration-testing on the PFM at acceptance test level.

Structural design shall be based on fracture control principles and procedure. See IIRD document “SOVIM-PMO-PQA/G-109”.



2 Pressurized System

SOVIM does not contain any pressurized systemsor subsystems.All internal boxes and instruments have holes to beadequately vented.The Sensor Package is vented trough three pairs of in/out valves,and in the case of DIARAD trough its openings in the cover plate.

Precision Filter RadiometerSOVIM2.1 Valves

The design is as for EURECA, SOVA and was space qualified (see:SOVIM-PMO-VER/G-002). The pressure difference to activate the valve is set to ±50hPa, which is individually tested for each valve.

The EURECA breathe out valves




3 Material flammability, toxicity and compatibility

3.1 List of toxic materials

SOVIM does not contain any toxic materials. All the materials used are listed in the DML and DCL.

3.2 Final materials compatibility List

3.3 Material ListDML: SOVIM-PMO-PQA/G-102

DCL: SOVIM-PMO-PQA/G-103



4 Non-ionizing radiation

•SOVIM has one source of non-ionizing radiation: The three DC/DC converters. This sub-units are re-flight units, already used on ESA-EURECA and was successfully tested at ESA/ESTEC Testcenter Noordwijk (NL) according to the requirements: EURECA Electromagnetic Compatibility and Power Quality Specification” SPE 1200 604.

•Experiment EMC/EMI tests foreseen at ESTEC spring 2003



5 Electrical subsystems



DC/DC (eupow 2)

Cov erDr iv er

DPU(DIA RA D 7)

DPU(SOV IM)

PMO6-V

V FC-Pr int

SPM2

SPM1

PMO6-V

PMO6-S(EURECA )

TA SS(EURECA )

Pow er Commandsintern

Pow e r Sw itch (e up ow 1)

Sw itc h & Fus eDC/DC

Sw itc h & Fus eDIA RA D

Sw itc h & Fus eHeater

Sw itc h & Fus eIns t.

MainCurrentSens or

Cu rr . Se n s.

28V CurrentSens or SOV IM

28V Cu rre n tS e n so r DIA RA D

28V CurrentSens or Heater

28V CurrentSens or DPU

+13VTA SS

+8VA nalog

-8VA nalog

+5VDigita l

+10VBattery

28V Shutter

28V SPM Heater

Cov er &Loc kers

Pow er Sw itc h

Pow er Sw itc h

Pow er Sw itc h

Pow er Sw itc h

Pow er Sw itc h

Pow er Sw itc h

Pow er Sw itc h

Pow er Sw itc h

DC/DC

DC/DC

28V DPU

28V DIA RA D

28V COV ER

Heater Elec tronic

OperateHeater

Pow er Commandsex tern

Three Thermos tats

Stay -A liv e(non op.)

Heater

Pow er on h igh

Powe rC o n n e cto r

Three Thermos tats

Stay -A liv e(non op.)

Heater

5.1Overallpower distribution



5.1Main power switches and inrush current limiter

D P UP o w er IFC ircu its

D P U

SecundaryIn rush C urren t

L im iterP o w er R elais 28V to Ex perim entD C /D C


L im iterP o w er R elais 28V to D iaradIn terface C ircu its


L im iterP o w er R elais 28V to Instr.Shu tter and Heaters


L im iterP o w er R elais 28V to P ackageHeater

28V P o w er

Po

wer

Con

nec

tor

to C o v er D riv er

P rim aryIn rush C urren t

L im iter

P o w er O n /O ff

1

2

3

4

4 x elec .Fuse

P o w er O ff

P o w er O ff

P o w er O ff

P o w er O ffC

urr

ent

Mea

sure

men

t

to2

8V s

tay

aliv

e h

eate

r

to1

20V

stay

aliv

e h

eate

r

stay aliv eheater po w er



5.1 Schematics : Electrical fuse and inrush current limiter

V12N 2222A

V22N 2222A

V32N 2222A

R1

10M

R2

2k2

+4

-5

ResetS1A

T L5

D11N 5804

R315k

R456k

C110nF

R556k

1

2

3

V4A2N3810

7

6

5

V4 B2N 3810

R656k

R71k5

R8

1/3E

31

2S1CT L58

7

6S1DT L5

to inrush current limiter

28V Bat tery

U Hel p 2U Hel p 1

Bat tery GND

Power Of f

1 2

3 4

L1DRO S S E L

R1680k

R31M eg

C11uF

V 12N 6849

R2680k

R41M eg

C21uF

V 22N 6849

+C36. 8uF / 63V

1 2

L2CO IL

28V

B at t G ND

LF 1

LÖ T F A HNE

LF 2

LÖ T F A HNE

From Power Connector

to DC/DC

Inrush current limiterElectr. Fuse



5.1 EURECA reflight main power switch groups

One complete group including a relay, over-current measurement and a secundary inrush current limiter

Primary inrush current limiter

Main current measurement



5.1 Schematics : EURECA reflight DC/DC

3

21

84

U 1A

L M 1 93

5

67

U 1B

L M 1 93

Q 1Q 2 N 2 22 2

Q 4Q 2 N 2 90 7 A

R 12k 2

R 43k3

R 51k5

Q 5Q 2 N 29 0 7A

R 61k5

C 1

47pF

C 4

100p F

D 21N 41 5 3

R 910k

Q 3Q 2 N 22 2 2

R 10470E

R 32k2

T 2

2 1 :3

R 22k2

T 1

2 5 :25

D 1

1N 4 1 53 Q 2Q 2N 2 2 22

Q 6M 2N 6 7 96

R 71 M

Q 7M 2N 6 7 96

R 81 M

C 2

100n FL 1

5 0 u H

C 3

33nF /40 0V

T 3

D 31 N 5 8 0 4

D 4

1 N 5 8 04

D 5

1 N 5 8 04

T 5

1 :1 0 0

to cu rren t con v er te r a n d Feed ba ck

O u tp u tv o lta ge

1 0 V S pez

2 8 V D C /D C

One of four DC/DC groups



5.1 EURECA reflight DC/DC

+5V -8V +8V +13V



5.1 DPU power interface circuits



5.1 Voltage to Frequency Converters14 VFC channels

Heater drivers

Housekeeping multiplexers

ASIC

Current sensor

Power switches

Connector harness



5.1 Cover Driver PCB

Hall element driver

Harness to VFC

One of five cover driver-stage



6 Verification Electrical Subsystems

•Prototyping and testing of all subunits before start of manufacturing of flight units•Detailed design review of all subunits•FMECA•Measurement of electrical signal levels at min/max condition•Measurement of timing range compatibility at min/max condition•Thermal environment test•Functional test•Data I/F is tested with “Electrical Software Simulator” at ALENIA



6 Avionics Control

n.a.



7 Mechanism in critical application

SOVIM


7.1 COVER Mechanism

The whole „Cover“ consist of five individualidentical cover mechanism. All five Coversare mounted on the cover plate.

Step Motor

Locking PinMoving mass 0.9 g

Linear Actuator

Cover(rotating mass 6.9 g)

Back Surface Mirror(mass 0.4g)

Hall Elements

End Stops

Cover Plate

TASS quartz window is covered with two slit apertures of 5 x 17.5mm size.

The locking pin is to hold the cover during launch and reentry in position, to protect the sensitive surfaces against contamination.



7.1 Cover Mechanism

Diarad openings

Single coverwithout BSM

End stops

Motor axle

Cover Mechanism view from the sun-direction

Cover PlateLocking pin

TASS openingswithout quartz window



7.1 Radiometer Shutter Mechanism

90° Actuator

Shutter covered with BSM(3.6 gr.)

Position sensing PCB



7.2 Reports of mechanism verification

Reports of mechanism verifications will be delivered at IFDR and with PFM-H/W acceptance data package at delivery.

Already done are the following verifications :

•Cover qualification tests

•Cover life test

•PMO6-V shutter life test

•DIARAD shutter life test



8 Batteries

SOVIM does not contains any batteries or elctrolytic capacitors.



9 Sealed Containers

SOVIM does not contain any sealed containers.Please refer also to point 2 : Pressurized System.

... internal boxes and instruments have holes to beadequately vented....

precision filter radiometer sovim observatory davos world radiation centersafety workshop 6&7...

Documents

safety critical parts

user interface module

eureca reflight instrument

pmo6r radiometerthe

flight tass of eureca

batteries n

critical applicationsummary

older pmo6r type