Test Type: CTE, Michelson Laser Interferometer, Reference ASTM E289
The PMIC Michelson laser interferometer measures real time thermal expansion and contraction. Each shift in the fringe pattern corresponds to a change in specimen length of one-half the laser wavelength (316 nm (12.456 µ-in) for a He-Ne laser in vacuum).
Precision optics, photo detectors and interpolation techniques allow nanometer resolution. This technique uniquely allows a wide range in specimen size and shape. Thin films, plates, sandwich structures and tubes up to 3m long can be tested. Multi-directional strains can be determined simultaneously, e.g., for composite components or structures.
Specifications:
| Resolution | 10 to 50 ppb/ºC |
| Temperature Range A | -150°C (123K) to +150°C (423K) |
| Temperature Range B | -160°C (113K) to +725°C (1000K) |
| Temperature Range C | -235°C (38K) to +50°C (323K) |
| Specimen Size | Simple to Complex |
| Control Software | LabView |