A fully automated, bench-top instrument measuring lubricant film thickness down to 1nm in the elastohydrodynamic (EHD) lubricating regime.
The EHD is a fully automated computer controlled instrument for measuring the film thickness and traction coefficient (friction coefficient) of lubricants in the elastohydrodynamic lubricating regime. The instrument can measure lubricant film thickness down to 1 nm with a precision of +/- 1 nm. The contact pressures and shear rates in this contact are similar to those found in, for example, gears, rolling element bearings and cams. In addition to film thickness measurements, traction coefficients can be measured at any slide/roll ratio from pure rolling up to 200%.
The instrument measures the lubricant film thickness properties in the contact formed between a ¾“ (19.05mm) diameter steel ball and a rotating glass disc by optical interferometry. The lubricant film thickness at any point in the image can be accurately calculated by measuring the wavelength of light at that point. Normally the system measures the wavelength of the light returned from the central plateau of the contact and hence calculates the central film thickness.
| Technical Specifications | |
|---|---|
| Film Thickness | 2 - 1000 nm |
| Load | 2 - 50 N |
| Contact Pressure | 0.24 - 2.0 GPa (Dependent on specimens used) |
| Speeds | 1 mm/s to 4 m/s |
| Temperature Range | Ambient to 150 °C |
| Test Sample Volume | 120 ml |
| Power Supply | 100 - 240V, 50/60 Hz, 750 VA |
| Weight (Electronics Unit) | 17 kg |
| Dimensions (h x w x d) (Electronics Unit) | 440mm/17" x 230mm/9" x 500mm/20" |
| Weight (Mechanical Unit) | 47 kg |
| Dimensions (h x w x d) (Mechanical Unit) | 750mm/30" x 1100mm/43" x 350mm/14" |
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