Measurements
Table of Contents
-
-
- 1. Effect of all the control systems on the Sample vibrations +
- 1. Effect of all the control systems on the Sample vibrations
-
-
- 1.1. Experimental Setup -
- 1.2. Load data -
- 1.3. Analysis - Time Domain -
- 1.4. Analysis - Frequency Domain +
- 1.1. Experimental Setup +
- 1.2. Load data +
- 1.3. Analysis - Time Domain +
- 1.4. Analysis - Frequency Domain -
- 1.5. Effect of the control system on the transmissibility from ground to sample -
- 1.6. Conclusion +
- 1.5. Effect of the control system on the transmissibility from ground to sample +
- 1.6. Conclusion
- - 2. Effect of all the control systems on the Sample vibrations - One stage at a time +
- 2. Effect of all the control systems on the Sample vibrations - One stage at a time -
- 3. Effect of the Symetrie Driver +
- 3. Effect of the Symetrie Driver -
- 4. Transfer function from one stage to the other +
- 4. Transfer function from one stage to the other
For all the measurements shown here: @@ -353,13 +350,12 @@ For all the measurements shown here:
1 Effect of all the control systems on the Sample vibrations
+1 Effect of all the control systems on the Sample vibrations
All the files (data and Matlab scripts) are accessible here.
@@ -368,8 +364,8 @@ All the files (data and Matlab scripts) are accessible
-
We here measure the signals of two geophones:
@@ -388,7 +384,7 @@ First, all the control systems are turned ON, then, they are turned one by one.
Each measurement are done during 50s.
Figure 22: Setup with one geophone on the translation stage and one on top of the Tilt Stage Figure 23: Setup with one geophone on the translation stage and one on top of the Tilt Stage - Top view Figure 24: Setup with one geophone on the translation stage and one on top of the Tilt Stage - Close up view
We load the data of the z axis of two geophones.
@@ -1608,8 +1601,8 @@ ty_ry = load(
-
First, we can look at the time domain data.
@@ -1628,7 +1621,7 @@ xlim(
+ Figure 25: Time domain - Marble and translation stage Figure 26: Time domain - Marble and tilt stage Figure 27: Time domain - Translation stage and tilt stage
-First, we compute the transfer function estimate between the two geophones for the 3 experiments (figure 28). We also plot their coherence (figure 29).
+First, we compute the transfer function estimate between the two geophones for the 3 experiments (figure 28). We also plot their coherence (figure 29).
Figure 28: Transfer function from the first geophone to the second geophone for the three experiments Figure 29: Coherence between the two geophones for the three experiments
@@ -1764,7 +1757,7 @@ These measurements are not relevant.
+This web-page gathers all the measurements done on the ID31 Micro Station.
+
-Resonances have been identified at 45Hz and 75Hz.
-However, the quality of the measurements are bad at low frequency.
-New measurements should be done with Geophones.
-
Obtain better coherence at low frequency.
@@ -448,27 +427,30 @@ Obtain better coherence at low frequency.
-Resonances at 42Hz, 70Hz and 125Hz have been identified.
-The coherence is much better than when using accelerometers.
-
The station is now installed on the experimental hutch with a glued granite (final location).
@@ -513,268 +495,56 @@ The station is identified again.
+
+
-The objective is to estimate how much perturbation is injected in the system by the control systems of each stages of the micro station.
-
-Geophones are located on the structure.
-Each stage is turned on and off.
-The signals of the geophones are then compared when the stage is on and off.
-
-Each stage is statically moved of all its stroke on after the other.
-A metrology element is located at the sample position and its motion is measured in translations and rotations.
-For each small displacement, the stage is stopped and the motion of the sample is recorded and averaged.
-
-The goal is to estimate the guiding errors of each stage.
-
-The objective is to obtain the Power Spectral Density of the ground motion at the ID31 floor.
-
-The goal is to estimate all the error motions induced by the Spindle
-1.1 Experimental Setup
+1.1 Experimental Setup
data array contains the following columns:
4.2 Load data
+4.2 Load data
4.3 Analysis - Time Domain
+4.3 Analysis - Time Domain
4.4 Analysis - Frequency Domain
+4.4 Analysis - Frequency Domain
dt = m_ty(2, 3) - m_ty(1, 3);
@@ -1687,7 +1680,7 @@ win = hanning(ceil
[T_m_ty, f] = tfestimate(m_ty(:, 1), m_ty(:, 2), win, [], [], Fs);
@@ -1726,7 +1719,7 @@ xlim(
+
4.5 Conclusion
+4.5 Conclusion
Table of Contents
-
1 Measurements of the dynamics of the station
+1 Measurements of the dynamics of the station
-1.1 Measurement 1
+
+1.1 Measurement 1
-1.1.1 Notes
+1.1.1 Notes
@@ -369,8 +345,8 @@ Dynamics of the station is evaluated using instrumented hammer and accelerometer
-
1.1.2 Goal
+1.1.2 Goal
1.1.3 Results
+1.1.3 Results
+
+
+1.2 Measurement 2
+1.2 Measurement 2
-1.2.1 Notes
+1.2.1 Notes
@@ -439,8 +418,8 @@ New measurements should be done with Geophones.
-
1.2.2 Goal
+1.2.2 Goal
1.2.3 Results
+1.2.3 Results
+
+
+1.3 Measurement 3
+1.3 TODO Measurement 3
-1.3.1 Notes
+1.3.1 Notes
@@ -503,8 +485,8 @@ The coherence is much better than when using accelerometers.
-
1.3.2 Goal
+1.3.2 Goal
1.3.3 Results
+1.3.3 Results
+2 Measurements of perturbations
+2 Measurements of perturbations
2.1 Noise coming from the control loop of each stage
-2.1.1 Notes
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-Date
-2018-10-15
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-
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-Sensors
-Geophones
-
-
-
-Location
-Experimental Hutch
-2.1.2 Goal
-2.1.3 Results
-
-
2.2 Static guiding error estimation
-2.2.1 Notes
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-
-
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-
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-Date
-2019-01-09
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-
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-Sensors
-Interferometer
-
-
-
-Location
-Experimental Hutch
-2.2.2 Goal
-2.2.3 Results
-2.3 Ground motion measurements
-2.3.1 Notes
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-
-
-
-
-
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-Date
-2014-10
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-
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-Sensors
-Geophone
-
-
-
-Location
-ID31 Floor
-2.3.2 Goal
-2.3.3 Results
-2.4 Spindle Measurements
-2.4.1 Notes
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-
-
-
-
-
-
-Date
-2017-04-25
-
-
-
-Location
-PEL Lab
-2.4.2 Goal
-2.4.3 Results
-3 Ressources
+3 Other
4 Other measurements
-
