Energy Differential Interferometric Techniques

This paper includes a energy differential interference fringe curve by analysing energy distribution character in amplitude interferometer and M-Z interferometer with the He-Ne laser as light source, by which an interferential energy distribution curve has been obtained. Such a curve could be used as an interference differential interferometry, in which the receiving area have been changed in order to obtain the energy changing curve. The fact that interference optical measurement can effectively eliminate background noise and vibration influence has been demonstrated by theory and experiment.The changing character of reflective energy and refractive energy , which vary with the angleα, has been analyzed (αis the angle between the two plates). The results show that the change of reflective energy and refractive energy lessens asαincrease and it tend to be steady whenαis large enough. The character can be used to compensate unstable source and stray light in interferometer. This paper introduces the compensation used in laser interference dilatometer.The energy differential interferemetry principle based on M-Z interferometers has been introduced in detail,a conclusion that the energy of the two vertical output optical interference fringe change with the angle between two beams is derived, and also the paper approves that they are complementary symmetry. Based on this principle, an energy differential interferometry is proposed. If a variable diaphragm is added into collimating device of M-Z interferometer, the energy of the two output vary with radius, a interference fringe curve with the same phrase and the same period has been obtained by making differential amplifier on this two optical energy.Back light and stray light can be erased by this kind of differential interference measurement, it also can make integral representation to flutter fringe. Since the external disturbances could influence the symmetry properties of the two symmetry interferogram. Energy differential interferometry and integral average can cancel shake's influence effectively under certain condition.Main innovation point :1. Introducing a energy differential interferemetry measurement based on M-Z interferometers2. Differ from the general interferometry, the detected or treated fringe is the entire energy of optical interference field rather than the partial energy of interference fringes.3. Taking difference amplifier output wave as fringe wave on the basis of symmetry of the two output in M-Z,. Ground noise is erased, fringe contrast is proved.4. Energy difference interferometry can dramatically erase fringe wave bounce provoked by shake.