Abstract
The authors of the paper deal with measurement of heat and mass transfer for several years and they have frequently used few techniqes for measurement of refractive index distribution based on holographic interferometry. Some of the well known techniques have been modified some and some new ones developped. Every technique could be applied with success in different type of meassurement and obviously every one has set of properties making them unique. We decided to digest few different basic techniques and describe its properties in this paper with the aim to help the reader select the proper one for their measurement. The list of techniques and its properties is not comprehensive but schould serve as a basic orientation in the field.
Highlights
Heat and mass transfer measurement is very important discipline in thermomechanics
Every technique could be applied with success in different type of meassurement and obviously every one has set of properties making them unique
The maximum angle T max between these two waves is related to spatial frequency, which the given CCD can record without violating the Nyquist criterion
Summary
Heat and mass transfer measurement is very important discipline in thermomechanics. Many different techniques have been applied since its systematic measurement started. Holographic interferometry HI and especially its recent digital form DHI opened new perspectives in heat and mass transfer measurement. We adapted some classical techniques to digital form and developed some new techniques from scratch like synchronizing in coherent phenomena measurement. Measurement of small pressure changes and development in the air is taken as a major discipline which we are willing to progress in. Those small changes are translated to very tiny refractive index change so we aim mainly to sensitivity increase progress
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