Granuloshop Lab: Laser Cell # 1

We offer 3 tutorials.
#1 How to maintain your cell clean
#2 How to clean a sample cell
#3 Cell Repair Services by Granuloshop
Please learn from these 3 tutorials in the suggested order! ...
All our tutorials and presentations are here

Comments ? Bug reports ? Please click here
v1.1: Dec 30 2011 / prototype / duration: 4:00 mn
OK = IE, Firefox, Chrome, Safari (+ Quicktime); uncertain = iPad, Android.

Set-Zero (blank)


Set-zero = signal received by diffractometer without sample, then substracted from signal => sample specific signal. Too high = Warning!

Look at set-zero: if only a very small deviation triggered the alarm, you may still decide to ignore the warning

Turbid liquid


several, easy to identify possible causes

Array calibration


Your instrument will serve many , many years. The natural aging of detectors must be corrected on a regular basis.
Do not forget to perform the uniform (array) calibration (at least once / 3 months)

This calibration applies to optics downstream of the cell, if the problem persists then it is at the cell or upstream.

If the cell is the cause ...


To confirm if the cell is the cause, one may have to remove and clean it: this will be lesson #2
possible causes:

Internal pollution prevention


Internal pollution of cell glasses can often be prevented, delayed or reversed by simple measures you should know

A 60 micron filter protects recirculators connected to water network. uncloag it once / 2-3 years.
Tip : use the filter at the inlet side of the tubing as a plunger into beaker or water tank

Preventing pollution of the outside


special laser coatings are on the outside of cell windows. if stained or damaged: very difficult to get them back to work