Durango Interferometry Software typically provides phase shifting by controlling the analog voltage applied to a PZT phase shifter. Diffraction International phase shifters are low voltage devices that shift nominally 4.7 fringes at +10 V for 633 nm wavelength. This is the typical voltage range of digital-to-analog devices that can be installed in or connected to a desktop or laptop computer.
Many interferometers require a phase shift voltage in the range 100 V to 1000 V. This will require a voltage amplifier between the controller device and the phase shifter. Diffraction International phase shifters will require a voltage amplifier when used with interferometers operating at mid-IR or LWIR wavelengths.
Durango can control wavelength shifting interferometers, usually by means of an analog current. Diffraction International has also developed custom software modules that enable Durango to control a number of other phase shifting and wavelength shifting devices.
|Phase Shift Controllers|
|Device||Form Factor||I/O Connector||Adapter
|Volts Out||Current Out||Resolution||Update Rate|
|*LEMO connector added by Diffraction International|
|NI PCIe-6321||PCI Express||68-pin VHDCI||±10 V||5 mA||16 bits||900 kS/s|
|NI PCI-6221||PCI||37-pin D-SUB||±10 V||5 mA||16 bits||900 kS/s|
|NI PCI-6024E||PCI||68-pin SCSI-II||±10 V||5 mA||12 bits||10 kS/s|
|NI USB-6211||USB||LEMO*||±10 V||2 mA||16 bits||250 kS/s|
|NI DAQCard-6024E||PCMCIA||68-pin VHDCI||±10 V||5 mA||12 bits||1 kS/s|
low voltage PZT controller, modified by Diffraction International to include LEMO connector.