Mcjanda interferometer<br>Fig. 4 mcjanda interferometer<br>The optical arrangement of Mach Zender interferometer is shown in Fig. 4. Compared with Michelson interferometer, Mach Zender interferometer has two advantages<br>1. The paths of the two lights can be completely separated, which makes the measured object more flexible in arrangement.<br>2. The transparent object is less interfered by the multi-channel reflected light (Fig. 5), while the light route of the Maxon interferometer is the same path back and forth, so the noise is large.<br>Fig. 5 measurement of transparent object by Mach Zender interferometer<br>We can use Mach Zender interferometer to measure the force on a transparent object. When the object is stressed, its refractive index and thickness will change, and the phase of one of the beams will change accordingly. According to the change of fringes, we can measure the stress change of the object to be measured. Like the Maxwell interferometer, we can adjust the micro screw until the light points of the two light fields coincide to form interference fringes. When one of the lights is added to the flame, we will observe the change of the air heat flux field caused by the heat of the flame (Fig. 6). When we add a jet stream to one of the lights, we can also observe the disturbance of the airflow on the convective site. It can be seen from the above two examples that the Mach Zender interferometer is very suitable for the detection of heat flow field. Since the whole installation is very simple and elastic, and can achieve the purpose of non-contact measurement, some measurements in harsh environment are made by using Mach Zender interferometer. For example, using Mach Zender interferometer to measure plasma density and combustion gas disturbance in internal combustion engine cylinder are common examples.<br>
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