Our standard adaptive optical systems are based on Windows PCs, high-voltage amplifiers and digital-to-analog converters (DAC) serving as interface between a PC and an amplifier. We have developed a number of interfaces and amplifiers that allow to control high-voltage deformable mirrors with up to 2 kHz frequency, voltage up to 400V with a precision of 8 (PCI), 12 (USB), or 16 (Ethernet) bits.
OKO PCI boards allow to control up to 24 channels with a single board, the number of boards per PC is practically unlimited. The refresh time is better than 1 microsecond per channel, all channels of the board can be controlled independently in any order.
A single USB DAC or Ethernet DAC module allows to control 40 channels with refresh frequency of 1 or 2 kHz and precision of 12 or 16 bits. These modules can be used in parallel to control 80, 120… etc. channels with refresh frequency of up to 2 kHz.
To drive adaptive optics devices with small number of actuators, such as tip-tilt correctors we offer special scaled-down 4-channel vesion of USB DAC.
Flexible Optical B.V. presents new 40-channel 16-bit DAC unit with Ethernet interface, featuring 2 kHz refresh rate for all 40 channels simultaneously.
“EDAC40” is a digital-to-analog converter unit with Ethernet 100Base-TX network interface. It provides 40 analog output channels with amplitude resolution of 16 bits and refresh rate up to 2 kHz via UDP or TCP protocols. The device features bipolar output amplifier with software adjustable gain and offset, which allows to tune the device to the needs of particular application without sacrificing the dynamic range.
Digital-to-analog converter unit “DAC-40-USB” provides 12-bit voltage control for 40 output channels. The output voltage range can be trimmed continuously in the range 1.25 … 5 V for all channels. Several units can be used simultaneously with a single PC. These units are applicable to a range of environments when a simultaneous independent control of a large number of analog output channels is required.
Technical parameters
Parameter
Value
Analog outputs
{gallery /}This small bus-powered digital-to-analog converter module designed to drive adaptive optics devices with small number of actuators, such as tip-tilt correctors. Its architecture mostly follows one of DAC40USB module with scaled down number of channels, so programming interface is also very similar. The device provides 4 analog outputs with resolution of 16bit and settling time of 10us. Analog output range of the can be adjusted between 2.5 and 5.5V by trimming potentiometer and the jumper.
{gallery /}This unit designed to drive our tip/tilt stages and features four-channel digital-to-analog converter with USB interface, A4MEMS high-voltage amplifier and mains power supply assembled in a compact housing.
OKO produces a range of high-voltage amplifiers, to drive MEMS and piezoelectric actuators.
Unipolar DC HV amplifiers have 40 (20) independent channels, each producing output in the range 0 to +300V. These amplifiers are specially designed to drive MEMS devices and deformable mirrors. Each unit has 40 (20) identical indepndent amplifiers with gain of 55 (80). The module features compact 40x200x280mm size, weight of 1,2 kg, 20W energy consumption and works in any country with AC power supply in the range from 85 to 250 V.
A4MEMS is a low-cost high-voltage DC amplifier. In the new version we have significantly improved the frequency response of the amplifier gain, extending the operational regime up to 2 kHz for 4 nF load.
We designed this 3-channel high-voltage amplifier as a low-cost solution for prototyping of multichannel high-voltage MEMS circuits. It is a convenient tool for driving a wide variety of electrostatic and piezoelectric actuators. Each of its 3 independent amplifiers with gain of 56 is capable of driving capacitive loads in a wide frequency range.
OKO digital PCI boards provide 8-bit voltage control for 24 output channels. The output voltage range can be trimmed continuously in the range 2.5 … 10V for all channels. Setting time per channel is about 1 microsecond, each channel is controlled by a separate DAC. Several boards can be used simultaneously with a single PC. These boards are applicable to a range of environments when a simultaneous independent control of a large number of analog output channels is required.
A4MEMS is a low-cost high-voltage DC amplifier. A4MEMS measures 110 x 60 x 30mm. It provides 0 … 300 V output in 4 independent channels. Voltage ranges up to 0 … 400 V are available on a special order. The unit does not require any external high voltage supply and can be powered from any 15 V 200 mA laboratory supply. A4MEMS was specially designed as a quick low-cost solution for prototyping of multichannel high-voltage MEMS circuits.
We produce three different types of 20-channel driver boards for deformable mirrors. These boards have gain of 59, 35, 81, providing output voltage swing [0…400V] for input range [0…10V] in a frequency range up to 10 kHz (depending on the load capacitance). One board will drive one 19-channel deformable mirror, two boards will drive a 37 or 39-channel mirror. In addition, we can fabricate custom 20-channel drivers for voltage range [-400…+400V] for capacitive loads of up to 20uF.
