Null Hartmann and Ronchi-Hartmann tests.
Assuming the Ronchi and the Hartmann tests to be null tests, we were able to design special screens for each test that produce aligned straight fringes and a square array for the observed patterns. It also became clear that the screen filter and observing planes for both tests can be interchanged.
Cordero-Davila
A
A
Cornejo-Rodriguez
A
A
Cardona-Nunez
O
O