Section 2: Window Material

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Free Space Absorption Tubes
General Info Sheet
<blurb about molecular absorption>
<blurb about our tubes and purpose of document>
Our free space absorption tubes come in a wide variety of configurations to suit our customers’ needs across several industries
including gas sensing, calibration and research. Due to the large number of configurations this info sheet was created to help our
customers determine what absorption tube best fits their needs.
Of course, if you have any questions, please don’t hesitate to contact us.
Section 1: Tube Parameters
Description
Path Length (does not
include windows)
Length Tolerance
Outer Diameter
Clear Aperture
Stem Tube
Wedge
Tilt
Window Thickness
Abbr.
Standard Specs
L
2.5cm, 5.0cm, 10cm
OD
CA
T
+/- 0.1cm
12mm, 25mm, 40mm
9mm, 21mm, 36mm
< 8mm
0.5 degrees nominal
3 degrees nominal
1.5mm nominal
Section 2: Window Material
Window material is primarily determined by the application wavelength range:
< 2.6 microns: AR-coated glass
< 6 microns: Magnesium Fluoride
< 8 microns: Calcium Fluoride
< 14 microns : Zinc Selenide
Section 3: Concentration and Pressure
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Ordering Information (example) (if deemed necessary for info sheet)
CH4-T(25x10)-100-ZnSe
Carbo
n
isotop
e
H(3):3cm path
H(5.5): 5.5cm
path
Pressu
re
(Torr)
Connector
type
(include
/PD for
photodetec
tor)
<spectra with gas absorption regions marked- if I can get it to fit>
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