RMT Robotics DX6106 Manual do Utilizador descarregar pdf (Página 8)

2-2

where

– intensity of light before pass through the gas

volume;

– intensities of light after pass through the gas

volume;

– absorption coefficient of the gas at the chosen

light wavelength;

– optical pass length;

– gas concentration.

At a fixed and

known

absorption it is

possible to find

gas concen-

tration using

measured

intensity of light

(measuring

channel) that

passed from

Light Emitter to

Photodetector.

I

I

L

X

L

0

a

a

According to the Beer-Bouguer-Lambert law, light

absorption in a gas volume is proportional to the

absorbing gas concentration:

e

XL

I

I

0

a-

×

=

REV. 1.10/2002

RMT LtdRMT Ltd

RMT LtdRMT Ltd

DX6106

4.0

Fig. 2.2. Spectral bands of light

emitters for methane analyzer

2.0

0

0.5

1.0

3.0

Reference

channel

Photodetector

Measuring

channel

Relative response

Wavelength, mµ

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 60 61

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