Buchi NIRFlex N-500 User Manual download pdf (Page 41)

4 Description of function

41 NIRFlex N-500 Operation Manual, Version F

4.6.16 Transﬂectance adapter for NIRFlex Fiber Optic Solids

The transﬂectance adapter is an optional accessory for the NIRFlex Fiber Optic Solids and enables to

measure liquid samples, pastes and transparent ﬁlms.

The transﬂectance measurement principle is a combination of transmission and diffuse reﬂection: The

light coming from the optical ﬁbers penetrates the liquid sample in the gap between the probe window

and the transﬂectance adapter window (½ pathlength), is diffusely reﬂected at the white standard layer

behind the adapter window, passes the sample liquid in the gap a second time and goes back into

the optical ﬁbers.

The transﬂectance adapter is suitable for the analysis of viscous, non-agressive liquids. Thanks to the

reproducible, adjustable pathlength it is suitable both, for the meausurement of slightly and of strongly

absorbing samples.

The transﬂectance technique is a good compromise for customers, who only analyze liquids occasio-

nally.

As the measurements are carried out in the original sample containers, the probe head needs to be

dipped into the sample.

Transﬂectance adapter

4.6.17 NIRFlex Fiber Optic Liquids

NIRFlex Fiber Optic Liquids

The NIRFlex Fiber Optic Liquids is the ideal conﬁguration to measure liquid samples in their original

container.

The transmission probe operates with monoﬁbers.

As the measurements are carried out in the original sample containers, the probe head needs to be

dipped into the samples.

The handle is equipped with a remote control for initiating the measurements remotely and displaying

the results using LEDs on the handle.

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Buchi NIRFlex N-500 User Manual Page 41