Optodyne's VS-5020 Vibration Sensor is a noncontact, highly sensitive means of measuring displacement, velocity, and acceleration. Performing as a storage oscilloscope for mechanical vibration, the VS-5020 meets precision engineering requirements of microelectronic, aerospace, automotive, and >

R&D applications. A two-axis system, the VS-5020 provides measurement accuracy of 1 ppm, resolution to 0.1 microinch, speed up to 200 in/sec, and frequency response from do to 400 kHz. The extremely high signal-to-noise ratio of this two-axis system permits the user to measure simultaneously both target and background phenomena, while maintaining the integrity of each measurement. > Compact and light-weight Non-contact and high sensitivity Simple setup and operation Variable standoff (few mm to few meters) Small beam spot diameter (10-100 micrometers) 2 channels for differential or orthogonal...

Fig. 1. Motion of the magnetic head of a smallhard disk drive Fig. 2. Typical spindle runout of a hard disk drive at 3600 rpm Fig. 4. The power spectra density of figure 3 Fig. 3. Typical magnetic head flight height variation >

SYSTEM DESCRIPTION Major elements of the VS-5020 include two LDDM > TM laser head assemblies, steering mirrors, a processor module, IBM-compatible 386 computer, software, carrying case, and accessories. Model VS-5020 Specifications > Sensitivity: Displacement resolution: 2.5 nm (0.1 inch) Min, return light: 1 microwatt Beam diameter: 5 mm (with lens) (10 to 100 յm) Data rate: 6.25 to 800 K data/sec Record size: 64K points/record or 128 kbyte/record Target Surface: Reflectivity >4% Surface finish. polished to 1-2 inch Surface flatness, 10 յinch over beam spot Ranges: Displacement: 2.5 nm nm to...