This applet simulates the operation of a Michelson interferometer under diffuse illumination.
On starting the applet, the user has access to four panels:
- The top left panel controls parameters relevant to the interferometer such as the separation in distance between the beamsplitter and each of the two mirrors, and the pressure of the gas in one arm of the cell. The -Code- input allows the user to input a number (such as their student number) to generate a random gas that is placed in the cell when using the -unknown gas- option. The interferometer can be used to measure the refractivity of the gas and hence identify its type. Possible gases are given below.
- The top right panel shows the image as seen on a camera placed 1 m from the interferometer.
- The bottom left panel provides a set of controls for how the image is viewed. Position and intensities are shown according to the position clicked in the camera display. Position units are in mm.
- The bottom right panel can be set to show the layout of the interferometer, the intensity across a horizontal linear array, or the time history of the intensity at the selected position.
Valid gases are:
|Gas||Refractivity (n-1) x10^-6|