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The  ATF4-PZ Sensor
WDI’s ATF4-PZ is a high speed, high accuracy, autonomous digital autofocus sensor. Its “Smart Sensor Architecture” (SSA) incorporates a semiconductor laser, built-in CMOS image sensor, FPGA and microprocessor for fast digital image processing. By projecting a laser dot onto the sample and digitally processing the image, the ATF4-PZ provides fast and precise output to accuray control the focus position of external piezo Z actuators and stages. By supplying an analog output, the AFT4 PZ can connect and direct a piezo Z device without the need to go through a secondary controller.
High Accuracy At Fast Speeds
WDI’s ATF4-PZ sensors project their focusing laser directly through the objective lens of the microscope. This “Through The Lens” (TTL) technique allows the ATF4-PZ to provide extremely accurate autofocus, exactly on the microscope’s FOV. The ATF4-PZ’s on board digital processing allows it to couple this accuracy with extremely high speeds. As the ATF4- PZ connects directly to the piezo Z device autofocus times are shortened.
Tracking Autofocus
The ATF4-PZ continually assesses both the distance and direction to focus, updating its data every 0.6 milliseconds. This allows the sensor to keep samples in focus regardless of whether they are stationary or in motion. This powerful tracking autofocus makes the ATF4-PZ perfect for scanning very large specimens quickly and precisely.
Maximum Flexibility
The ATF4-PZ sensor is designed to automatically adjust its laser intensity as well as the image sensor’s exposer time, allowing it to adapt to a wide variety of specimens, from low reflectivity (down to 1%) to highly reflective (up to 99%). It operates very well on plain reflective surfaces such as glass and unpatterned Si wafer. It is compatible with objective lenses from 2X to 100X magnification, and wavelengths including UV, NUV and NIR. The ATF4-PZ includes Laser Enable and Camera Sync features for automatically suspending the laser.
Easy Integration
All of the sensors in WDI’s ATF family are designed with ease of integration in mind. They are compatible with most types of infinity corrected microscope objectives. The AFT4-PZ comes as a stand-alone sensor with analog output for direct connection to an external piezo a Z actuator or stage amplifier. All WDI’s ATF sensors have small, standardized footprints and connections, and can output in either analog or digital formats, making them both easy to install and easy to upgrade as application requirements evolve.
 

  ATF4-PZ Sensor AUTO FOCUS & SCANNING SENSOR