<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I would like to add to this discussion that one can eliminate residual jitter to a large extent by using interference window folders in the top windows. A large part of the jitter is due to "breathing" of the optical bench - as Tom points out. But some is also due to jitter in the timing circuitry for the laser. By using the interference window holders you always mask off the same bits of "glass" even though there is some jitter in the timing of the pulse. Doing that cleans up the signal significantly. <div><br></div><div>If you take care of jitter and integer fringe jumps in the preprocessor of SEDANAL, you can see the raw data quite nicely corrected for these artifacts before you do any fitting.<br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Arial; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Arial; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Arial; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">_________________________</div><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Walter Stafford<br><a href="mailto:wstafford3@walterstafford.com">wstafford3@walterstafford.com</a></div><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br></div></span></div></span></span><br class="Apple-interchange-newline">
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<br><div><div>On Jan 15, 2013, at 12:41, Ute Curth wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-15">
<div text="#000000" bgcolor="#FFFFFF">
<font size="-1">Dear all,<br>
<br>
<font size="-1">I hope you had a good start in 2013 and some of
you can possibly gi<font size="-1">ve me </font>advice on <font size="-1">a <font size="-1">pro<font size="-1">blem with ou</font></font>r
Xl-I machine.<font size="-1"> The raw data of our
interference op<font size="-1">tics</font> show (and always
showed) such an enormous vertical jitter that it is hard to
j<font size="-1">udge whether the <font size="-1">sample
sediments at all and where the meniscus is located </font></font></font></font></font></font><font size="-1"><font size="-1"><font size="-1"><font size="-1">(see
attached file)</font></font></font></font><font size="-1"><font size="-1"><font size="-1"><font size="-1"><font size="-1"><font size="-1"><font size="-1">. Whereas<font size="-1">, a</font>fter
subtraction of T<font size="-1">I and RI noise the
data look quite nice, I a<font size="-1">m wondering
<font size="-1">what <font size="-1">the reason
of this jitter is. Has anyone an idea a<font size="-1">bout its possible source and how <font size="-1">I can get rid of it?</font> <br>
<br>
<font size="-1">Thank you in advance<br>
<br>
<font size="-1">Ute</font><br>
</font></font></font></font></font></font></font></font></font></font></font></font></font>
<pre class="moz-signature" cols="72">--
PD Dr. rer. nat. Ute Curth
> Medizinische Hochschule Hannover
> Strukturanalyse
> OE 8830
> Carl-Neuberg-Str. 1
> 30625 Hannover
> Germany
>
> Tel.: +49-511-5329372
> Fax : +49-511-5325966</pre>
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