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Fiber coupled 20m optical path Multipass Herriott Type Cell
Description
The FOGMPC20-A multipass cell is a Herriott type absorption cell. It lends itself to applications which require a long interaction path between an electromagnetic wave and a gaseous sample, keeping the overall dimensions of the experimental apparatus reasonable. An incoming beam undergoes multiple reflections between two mirrors, describing two circles of spots on the mirror surfaces. The total number of 150 passes corresponds to an optical path length of 20.0 m. In one of the mirrors, a hole is provided for beam entrance and exit (diameter 4 mm). The dimensions of the mirrors, the separation of individual spots and the diameter of the entrance/exit hole have been chosen such as to avoid overlap of the spots up to a wavelength of 3 μm (distance between adjacent spots ≥ 6 × beam waist). The beam enters the cell in the horizontal plane. The fraction of the beam reflected by the entrance window also propagates in the horizontal plane and can be used for reference (e.g. wavelength measurement). The output beam travels upwards. Therefore, the three beams are clearly distinguished, which ensures an easy, accurate and unambiguous absorption measurement even in case of misalignment or incorrect focussing. The cell base and the alignment is designed with Fiber coupled with the SMF-28E Fiber.And you just need one Senko Fiber adapt to Connect the DFB Laser diode with our multipass cell.What’s more,we build-in Detector and amplifier circuit into our cell,The detector can output voltage signal Directly.You just need one SMA-BNC power line to connect Lock-in amplifier with the Detector(Refer as PIC-B).
PIC-A
PIC-B
Outstanding Features
● Long Optical path length 20.0m
● Clear input/output beam separation
● No interference fringes for λ < 3 μm
● Small volume
● Easy maintenance and refurbishment of mirrors
● “In situ” removal of inner tube
● Compact and rugged design
● OEM version on request Light
● Fiber Coupled Input,No need to align the optical path
● Build-in Detector and amplifier circuit,output voltage signal Directly
Light pattern on the input mirror of the Microphotons Herriott cell
when illuminated with a HeNe-laser
Measurement of atmospheric methane (CH4) for 2 consecutive days
TDLAS-2f Signal Curve
The accessories for the Cell
General Specifications
Parameter
Value
Units
Optical
path length
20.0
m
Cell
Volume
571
cm3
Overall
length
29.0
cm
Overall
height
7.0
cm
Overall
width
6.0
cm
Mirror
reflectivity (λ > 1 μm)
>
99.8
%
Transmission
(window excluded, λ > 1 μm)
>
26.6
%
Operating
pressure
10-3÷760
Torr
Window
transmission (CaF2)
0.2-9.5
μm
Coupling
fiber Type
SMF-28E
NA
Mirror
Coating
HR
Operation
wavelength
1510~1750
nm
Gas
Interface
Φ6
Tube
Insertion
Loss
<2
dB
Return
Loss
>60
dB
Weight
2.6
kg
Dimensions
Details for our Products
OEM cells and other types
One multi purpose cell. Special versions like OEM cells or multipass cells for harsh environment or aeronautical applications are available on request.
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