Microbalance Incorporated in Automatic Instrument for Mechanical Analysis of Human Hair Samples
Apr 22 2006
Each sample is transported for analysis from the storage cassette to the measurement module by a single axis robotic arm. Once in the measurement module, the fibre is clamped at one end and then moved down so the free end applies a load to the force measurement device.
The bending moment of the hair can be determined by measuring the load applied and the distance moved by the clamped end of the fibre. Furthermore, because human hair has a cross-section that is more elliptical than round, the instrument is able to rotate each hair around its own axis for further measurements to be taken.
One key element in the success of the instrument is precise force measurement and for this Dia-Stron selected the Mk4 microbalance head from CI Electronics. This has an electronic control system that maintains the measurement position regardless of the load, which is vital for an application where force and displacement are being measured.
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