Request Info4D Technology CorporationFor 3-D measurement of surface roughness on large polished optics and optical-quality surfaces, despite vibration or turbulence, 4D Technology Corp. has released the NanoCam Sq dynamic profiler. The instrument replaces the slow, messy replication methods required by traditional workstation interferometers. By enabling on-machine roughness metrology, it reduces handling and transportation of the optic, increasing throughput and reducing the risk of damage to expensive, mission-critical optics. It uses dynamic interferometry, incorporating a high-speed optical sensor that measures thousands of...See full productRelated content from Photonics MediaPRODUCTSPhotonics Spectra September 2022 IssueLight-Dependent Resistor PhotocellsCadmium Sulfide (CdS) Light-Dependent Resistors (LDRs) from Advanced Photonix Inc. are designed for visible light measurement from 400 to 700 nm. 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