Josef Stricker has written:

'Electronic heterodyne moire deflectometry' -- subject(s): Electronics

'Deferred electronic heterodyne moire deflectometry' -- subject(s): Heterodyning (Electronics)

They are used in electronics.

heterodyne fiber optic system?

A superheterodyne receiver is a Radio Frequency receiver method that multiplies the received signal frequency with a local oscillator frequency to get frequencies that are the sum and difference of the 2 frequencies. For example, if the received signal is 5MHz and the local oscillator frequency is 4MHz, they are multiplied together. 1MHz and 9MHz frequencies would be gotten. Usually the 1MHz is the Intermediate Frequency (IF). It will be admitted (through a band pass filter) later passed through the required electronic circuits for proper processing. There is also the method of the Variable Tuned Filter.

An oscillator is an electronic circuit that produces an electronic wave or signal. The oscillator signal is the signal the oscillator puts out. An oscillator can put out different frequencies and different types of waves depending on how it is designed. These signals have many different uses in electronics. For instance you can use it to convert DC (direct current) from a battery to 60 Hz AC (alternating current) to use in a home. Some oscillators are variable like what you have in your radio or TV for picking up different signals or stations. To produce an oscillator signal: if you know a lot about electronics you can build your own from parts you can get at some place like Radio Shack. Otherwise you can buy an oscillator. Radio Shack might have one or you might have to look on line. You also have to know what kind of wave and frequency you need to be sure and get an oscillator that produces that signal. If the signal you need is unusual you may need a variable oscillator.