Transcript Overskrift

EVK4-CT-2002-00093
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The MASTER EWO dosimeters
– how they work
Terje Grøntoft, NILU
Prague 1st June 2006
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EVK4-CT-2002-00093
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The EU project MASTER :
Research partners:
1) Norwegian Institute for Air Research (NILU) Norway.
2). Centre for Sustainable Heritage (CSH-UCL) University College of
London. UK.
3) Albert Ludwigs Universitet - Freiburg
Materialforshungs - sentrum (ALU-FMF) Germany
4) Technical University of Crete (TUC) Dept. of Environmental
Engineering, Polytechneioupolis. Greece.
Museum partners - Test sites:
5) National Museum in Krakow. Poland.
6) Trøndelag Folk Museum, Trondheim, Norway
7) Historic Royal Palaces, London. UK
8) The National Trust, Bury St. Edmunds. UK
9) Württembergisches Landesmuseum, Landesstelle für
Museumsbetreuung Baden Württemberg. Germany
10) Institute for Masonry and Construction Research, University of
Malta.
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The Early Warning Organic dosimeters:
Pollution and climate dosimeters for
organic objects collections
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Contents
1. The EWO dosimeter. The initial idea.
2. What are the ”specific” and ”generic” EWO
dosimeters.
3. The principle of the EWO-G(Generic) dosimeter.
4. The calibration of the generic EWO-G dosimeter
5. How to interpret the measurement result
from the generic EWO-G dosimeter
6. The user requirements to the EWO dosimeter.
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1. An EWO dosimeter - The initial idea.
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- To develop an early warning system
for organic objects.
- To assess degradation of organic
objects indoors.
- Should be an effect dosimeter
- Should be based on end-user
identified needs
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2. The EWO dosimeters
A transparent organic polymer (EWO-G) with
a dye indicator (EWO-S).
1. Production
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Spin coating
2. Mounting
Memory
circuit
EWO
polymer film
(ALU-FMF)
Glass substrate
1 cm
EWO-G
Sensor film
Grip
3. Exposure
4. Analysis
Environment
- 3 months
Light absorption
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The spesific
EWO-S
dosimeter
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Sample holder:
Portable
measurement
instrument
ALU - FMF
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The generic EWO-G dosimeter
Memory
circuit
Exposure at location
EWO-G
dosimeter
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Grip
1. Photospectrometer
in laboratory
2. Measurement at location
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3. The principle of the EWO-G dosimeter
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Effect of the
environment
on the EWO-G
RH + T
SO2
NOx
Light/UV
O3
Organic
acids
EWO-sensor
Exposed in museum
environment
Effect on sensor
Lightabs.
Exposure effect
340 nm
 (nm)
Photospectrometric
measurement
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4. The calibration of the EWO-G dosimeter
Statistical treatment of field test data using
multiple regression:
Scatterplot
40.00
30.00
PPO 3U B (C)
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Dependent Variable: PPO
(C)
EWO3U
3UBB(C)
20.00
10.00
0.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
Regression Adjusted (Press) Predicted Value
Predicted from calibration
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Calibration equation:
EWO-G effect = 0.75 NO2 + 1.34 O3 + 0.51 T + 0.35 UV
(ppb)
(ppb)
(oC)
(mWm-2)
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Trigger values for environmental parameters
and for the EWO-G.
Calibration point location
1 - Archive
store
Increasing
2 – Purpose
built museum
deterioration
3 – House museum
4 - Open structure
5 - External store with no
control
NO2
(ppb)
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2.5
5
10
15
Trigger values
O3
UV
(ppb) (mW/m2) RH =
45 %
1.15
1
1.15
20.8
3
3.75
22.9
6.5
15
24.5
12.5
37.5
26.8
25
37.5
29.0
T (oC)
RH =
55 %
19.3
19.3
21.4
23
25.3
27.6
RH =
65 %
18.2
20.2
21.8
24.1
26.2
Centre for Sustainable Heritage. University College of London
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EWO-G Trigger response
Calibration point location
1 - Archive store
Increasing
2 - Purpose
built
deterioration
museum
3 - House museum
4 - Open structure
5 - External store
with no control
Trigger response (ads-units). Sign = 97.5 % (One sided)
RH = 45 %
0.0114
0.0165
RH = 55 %
0.0107
0.0107
0.0159
RH = 65 %
0.0103
0.0153
0.0258
0.0418
0.0612
0.0251
0.0411
0.0605
0.0246
0.0405
0.0598
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5. Interpretation of the EWO-G dosimeter
Example: Musems from MASTER field test
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Station
EWO
Response
response
level
(MASTER field test)
Indoor.
Yearly mean.
(4*3 months)
0.0089
1. Blickling Hall
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2. National Museum of Krakow. The Jan Matejko House. 0.0143
2
3. The Karol Szymanowski Museum, “Atma”, Zakopane 0.0177
3
0.0186
4. Schwarzwälder Trachtenmuseum, Haslach
3
0.0196
5. The Museum of Decorative Arts & Design, Oslo.
3
0.0212
6. Trøndelag Folk Museum, Trondheim.
3
0.0214
7. Wignacourt Collegiate Museum, Malta.
3
0.0217
8. The Historical Museum of Crete. Iraklion
3
0.0284
9. Haus der Geschichte Baden-Württemberg, Stuttgart
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10. Tower of London, Bloody Tower.
0.0312
4
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The measurement result
Calibration
points
RH = 65%
2.
3. 0.0157
0.0246
Station
EWO
Concentrat- T and UV
response ions
Tower of
London
(RH =
62%)
0.0223
0.0312
NO2 (ppb):
16.9
(5)
(5)
T (oC):
15.0
(21.8)
(20.2)
O33 (ppb):
(ppb):
O
0.4
3.6
(6.5)
(6.5)
UV (mW m-2):
15
(15)
(15)
3.
4. 0.0246
0.0405
(#) = calibration values – level 3
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Interpretation by the Acceptability – location table
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Kind of
building
Archive
store
Purpose
built
museum
gallery
Historic
building
Open
display in
open
structure
Outside
store with
no control
Calibrated levels of EWO affected after exposure (lit LEDs on unit)
1
2
3
4
5
Expected
Environment
Environment is
Something is
Serious
environment
could be better
poor
wrong with
problem with
(acceptable)
control
building or
control
Environment is
Expected
Environment
Environment is
Something is
very good
environment
could be better
poor
wrong with
(acceptable)
control
Excellent
environment
Environment is
very good
Environment
could be better
Environment is
poor
Excellent
environment
Expected
environment
(acceptable)
Environment is
very good
Dosimeter is
not responding
Expected
environment
(acceptable)
Environment
could be better
Dosimeter is
not responding
Dosimeter isn’t
responding
Excellent
environment
Environment is
very good
Expected
environment
(acceptable)
Showcases: One calibration point lower than location
Centre for Sustainable Heritage. University College of London
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6. The end-user requirements to the
EWO dosimeter.
- Visible change
- Yes (indirectly)
- Easy to use
- Yes (?)
- Easy to interpret
- Yes (?)
- Cheap
- (?)
- Inert
- Yes
- Small
- Yes
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- Durable
- Yes
- Short-term and long term options
- Yes (partly)
- Range of sensor sensitivities
- Yes (High to medium)
- Able to relate to other kinds of monitoring
-Generic: Depends on data available
-Specific: Yes
- A diagnostic element to the sensor.
- Generic dosimeter: Yes - dependent on
knowledge about environment
Specific dosimeter: Yes
- All environmental risks to be monitored
- No ( visible light(LUX) and organic acids)
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Preventive
Conservation
Strategy
based on the:
EWO-G
dosimeter measurement
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MASTER-logo
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Calibration intervals for environmental parameters
Symbol
Calibration interval
NO2
1 – 20 ppb
O3
0.5 – 30 ppb
T
10 - 30 oC
UV
0 - 15 mW m-3-2
Additional variables
SO2
0 – 3.5 ppb
RH
10 –80 %
EWO-G effect =
0.75(0.17)NO2 + 1.34(0.30)O3 + 0.51(0.088)T + 0.35(0.21)UV
(#) = Uncertainty, 95 % significance level.
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Trigger values for the EWO-G dosimeter
EWO response (abs-units)
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0.020
Protection = 97.5 %
0.015
0.010
Point 1:
0.0107
0.005
0.000
0
0.5
1
NO2 (ppb)
1.5
O3 = 1 ppb,
UV = 1 mW m-2
T = 19.3 oC
RH = 55 %
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EWO-G Trigger response
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Calibration point location
1 - Archive store
2 – Purpose built
museum gallery
3 - Historic
building
4 - Open display in
open structure
5 - Outside store
with no control
Trigger response (ads-units). Sign = 97.5 % (One sided)
RH = 45 %
0.0114
0.0165
RH = 55 %
0.0107
0.0159
RH = 65 %
0.0103
0.0153
0.0258
0.0251
0.0246
0.0418
0.0411
0.0405
0.0612
0.0605
0.0598
Showcases:
One calibration point lower than location
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RH - monthly avarage (%)
RH-A
RH-B
RH-C
1-Oslo
69.1
34.1
37.5
2-Trondheim
76.1
47.2
50.6
3-Blickling Hall 76.4
62.5
62.5
4-Tower of London
74.0
62.3
62.3
5-Stuttgart
71.6
48.5
47.5
6-Haslach
72.8
52.4
53.2
7-Krakow
71.9
38.8
37.9
8-Zakopane
72.1
32.3
40.0
9-Wignacourt
76.9
66.1
67.0
10-Crete
58.8
59.7
59.8
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EWO-G Trigger response
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Calibration point location
1 - Archive store
Increasing
2 - Purpose
built
deterioration
museum
3 - House museum
4 - Open structure
5 - External store
with no control
Trigger response (ads-units). Sign = 97.5 % (One sided)
RH = 45 %
0.0114
0.0165
RH = 55 %
0.0107
0.0107
0.0159
RH = 65 %
0.0103
0.0153
0.0258
0.0418
0.0612
0.0251
0.0411
0.0605
0.0246
0.0405
0.0598
Showcases:
One calibration point lower than location
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Calibration
points
RH = 65%
2.
3. 0.0157
0.0246
Station
EWO
Concentratresponse ions
Tower of
London
(RH =
62%)
0.0223
0.0312
T and UV
NO2 (ppb):
16.9
(5)
(5)
T (oC):
15.0
(21.8)
(20.2)
(ppb):
O33 (ppb):
0.4
3.6
(6.5)
(6.5)
UV (mW m-2):
15
(15)
(15)
3.
4. 0.0246
0.0405
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Calibration
points
RH = 65%
2.
3. 0.0157
0.0246
Station
EWO
Concentratresponse ions
Tower of
London
(RH =
62%)
0.0223
0.0312
T and UV
NO2 (ppb):
16.9
(5)
(5)
T (oC):
15.0
(21.8)
(20.2)
(ppb):
O33 (ppb):
0.4
3.6
(6.5)
(6.5)
UV (mW m-2):
15
(15)
(15)
3.
4. 0.0246
0.0405
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