20m long pathlength gas compact absorption cell (1310-1670nm)

The long optical path gas absorption cell can be used for spectral analysis and detection. It mainly adopts the Herriot gas cell structure and a stable optical packaging structure, which mainly includes the gas chamber cavity, concave reflector, standard optical fiber connector, shockproof base and gas inlet and outlet. The unique suspension path design can ensure the vibration and temperature stability of the gas chamber, and can monitor the gas absorption line in real time in various complex environments. It has ultra-low system noise and is convenient for trace gas analysis

Product features：Optical fiber signal input, detector RF output、 The gas chamber has a stable structure, which can effectively prevent vibration and temperature effects、 The fiber collimator and detector are directly integrated into the gas chamber, without the need for optical path adjustment, and the operation is simple、 The gas structure is compact and small in size, which is easy to carry、 The structure is small in size, low noise、

Application area：TDLAS extractive analysis、 Ultra-high precision gas detection instrument

Unit Price

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Part Number

PL-20-1550-AR6-SA-SMA

Lead Time

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Stock

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General Parameters

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Dimensional Drawing

Parameter

Technical indicator	Value
Effective optical path	20 meters
Maximum beam diameter	1.48mm
Gas volume	571mL
Wavelength range	1510~1650mn
Lens coating	AR dielectric film (>99.8%)
Main material	304 stainless steel and high borosilicate glass
Gas interface	Φ6 quick plug
Insertion loss	＜2dB
Return loss	>60dB
Outer dimensions	295.4mm82.9mm92.53mm
Total product weight	2688g

Built-in photodetector parameters

Parameter	Symbol	Value	Unit
Forward current	If	10	mA
Backward voltage	Vr	30	V
Backward current	Ir	1	mA
Responsivity	Re(VR=5V,入=1550nm)	0.9	mA/mW
Dark current	ID(Vr=5V)	1	nA
Response time	Tr(RL=50Ω, 0V)	0.5	ns
Reverse breakdown voltage	Vbr(Ir = 10 μA)	30	V
Saturated optical power	Ps(Vr=5V)	6	mW
Operating voltage	Vr	0-10	V

Methods used

Used with our voltage conversion module, the connection is as follows:

The voltage conversion module needs to be loaded with ±12V DC voltage at the same time to work.

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Laboratory testing of methane concentration

Line connection:

(1) Connect the power cord and USB cable to the TDLAS control box

(2) Connect the photodetector to the +-12V power supply

(3) Connect the LASER OUT end of the control box to the optical path cell input fiber port

(4) Connect the optical path cell output end to the photodetector input end

(5) Connect the photodetector output end to the control box PREAMP end, i.e. the preamplifier end

(6) Connect TRIG OUT to oscilloscope channel 1

(7) Connect DAC OUT to oscilloscope channel 2

(8) Pass a certain concentration of CH4 gas into the optical path cell

(Second harmonic)

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