From 285b2e8e35483c97f341c6fbb507d0078ce40e0f Mon Sep 17 00:00:00 2001 From: Thomas Dehaeze Date: Mon, 2 Nov 2020 16:07:01 +0100 Subject: [PATCH] Update one figure --- figs/psd_combined.pdf | 4 +- index.html | 88 +++++++++++++++++++++---------------------- 2 files changed, 46 insertions(+), 46 deletions(-) diff --git a/figs/psd_combined.pdf b/figs/psd_combined.pdf index 11e6794..dd70067 100644 --- a/figs/psd_combined.pdf +++ b/figs/psd_combined.pdf @@ -3,7 +3,7 @@ 1 0 obj << /Producer (Apache FOP Version 2.4.0-SNAPSHOT: PDFDocumentGraphics2D) -/CreationDate (D:20201102155534+01'00') +/CreationDate (D:20201102160642+01'00') >> endobj 2 0 obj @@ -1333,7 +1333,7 @@ trailer << /Root 133 0 R /Info 1 0 R - /ID [<21DC2DF519CD1EA75EE5D58AA55D2A26> <21DC2DF519CD1EA75EE5D58AA55D2A26>] + /ID [<8297224F01A981397E48615303310A60> <8297224F01A981397E48615303310A60>] /Size 134 >> startxref diff --git a/index.html b/index.html index abb506b..98ffb03 100644 --- a/index.html +++ b/index.html @@ -3,7 +3,7 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - + Attocube - Test Bench @@ -35,45 +35,45 @@

Table of Contents

-
-

1 Estimation of the Spectral Density of the Attocube Noise

+
+

1 Estimation of the Spectral Density of the Attocube Noise

-
+

test-bench-shematic.png

Figure 1: Test Bench Schematic

-
+

IMG-7865.JPG

Figure 2: Picture of the test bench. The Attocube and mirror are covered by a “bubble sheet”

-
-

1.1 Long and Slow measurement

+
+

1.1 Long and Slow measurement

The first measurement was made during ~17 hours with a sampling time of \(T_s = 0.1\,s\). @@ -86,14 +86,14 @@ Ts = 0.1; % [s]

-
+

long_meas_time_domain_full.png

Figure 3: Long measurement time domain data

-Let’s fit the data with a step response to a first order low pass filter (Figure 4). +Let’s fit the data with a step response to a first order low pass filter (Figure 4).

@@ -117,17 +117,17 @@ The corresponding time constant is (in [h]): -
+

long_meas_time_domain_fit.png

Figure 4: Fit of the measurement data with a step response of a first order low pass filter

-We can see in Figure 3 that there is a transient period where the measured displacement experiences some drifts. +We can see in Figure 3 that there is a transient period where the measured displacement experiences some drifts. This is probably due to thermal effects. We only select the data between t1 and t2. -The obtained displacement is shown in Figure 5. +The obtained displacement is shown in Figure 5.

@@ -141,7 +141,7 @@ t = t - t(1);
-
+

long_meas_time_domain_zoom.png

Figure 5: Kept data (removed slow drifts during the first hours)

@@ -176,8 +176,8 @@ f_1 = f_1(f_1 < 2);
-
-

1.2 Short and Fast measurement

+
+

1.2 Short and Fast measurement

An second measurement is done in order to estimate the high frequency noise of the interferometer. @@ -196,11 +196,11 @@ Ts = 1e-4; % [s]

-The time domain measurement is shown in Figure 6. +The time domain measurement is shown in Figure 6.

-
+

short_meas_time_domain.png

Figure 6: Time domain measurement with the high sampling rate

@@ -217,15 +217,15 @@ The Power Spectral Density of the measured displacement is computed
-
-

1.3 Obtained Amplitude Spectral Density of the measured displacement

+
+

1.3 Obtained Amplitude Spectral Density of the measured displacement

-The computed ASD of the two measurements are combined in Figure 7. +The computed ASD of the two measurements are combined in Figure 7.

-
+

psd_combined.png

Figure 7: Obtained Amplitude Spectral Density of the measured displacement

@@ -234,19 +234,19 @@ The computed ASD of the two measurements are combined in Figure -

2 Effect of the “bubble sheet” and Aluminium tube

+
+

2 Effect of the “bubble sheet” and Aluminium tube

-
+

IMG-7864.JPG

Figure 8: Aluminium tube used to protect the beam path from disturbances

-
-

2.1 Aluminium Tube and Bubble Sheet

+
+

2.1 Aluminium Tube and Bubble Sheet

load('./mat/long_test_plastic.mat');
@@ -267,8 +267,8 @@ Ts = 1e-4; % [s]
-
-

2.2 Only Aluminium Tube

+
+

2.2 Only Aluminium Tube

load('./mat/long_test_alu_tube.mat');
@@ -282,7 +282,7 @@ Ts = 1e-4; % [s]

-The time domain measurement is shown in Figure 6. +The time domain measurement is shown in Figure 6. 

win = hann(ceil(length(x)/10));
@@ -292,15 +292,15 @@ The time domain measurement is shown in Figure 6.
-
-

2.3 Nothing

+
+

2.3 Nothing

-
-

2.4 Comparison

+
+

2.4 Comparison

-
+

asd_noise_comp_bubble_aluminium.png

Figure 9: Comparison of the noise ASD with and without bubble sheet

@@ -311,7 +311,7 @@ The time domain measurement is shown in Figure 6.

Author: Dehaeze Thomas

-

Created: 2020-11-02 lun. 16:03

+

Created: 2020-11-02 lun. 16:06