User's Manual

Construction of Optical Unit

RMT LtdRMT Ltd

DX6106

3-5

Optocomponent

Photodetector

Measuring

channel

emitter

Reference

channel

emitter

Fig. 3.7. OPRI elements

arrangement

The new generation OPRI optopair

consists of three optoelements integrated

into one case : two narrow-band light

emitters (of about 0.1 µm emission band)

and one wide-band photodetector.

The optopair consists of two special solid

state light emitters (light sources) and one

sensitive element (photodetector).

The peak emission wavelength of one light emitter is near

the absorption band of measured gas (measuring channel).

The peak wavelength of the other one is out of the

absorption band of gas (reference channel).

The photodetector has approximately equal sensitivity to

signals of both emitters.

All the elements of the optopair are mounted onto the

cooling surface of a single stage thermoelectric module of

1MT04-059-16 type with an

internal thermosensor (Fig.

3.7).

A number of steps have been

taken to decrease the

optoelements mutual

influence.

The pins layout of the

optopair is shown in Fig. 3.8.