Journal of research of the National Bureau of Standards · 1939 · 32 citations · 0 references
EngineeringManufacturing EngineeringHeat TransferMetrologyThermal AnalysisError EstimationInterferometryMeasurement ErrorTemperature MeasurementThermal Expansion AnalysisExpansionExpansion MeasurementsFilm ThicknessInterferometric Expansion MeasurementInterferometric MeasurementInterferometric MetrologyThermal ExpansionThermal Expansion Measurement
The Fizeau interferometric method, as applied to thermal expansion measurements, has been studied in order to determine the source of some very serious errors and to find means of reducing such errors. Two types of errors were found to predominate. These may be termed (1) error caused by tilting of the spacers under mechanical forces, and (2) error caused by variations in air-film thickness at the contact points. Such errors often amount to 10 percent and may, under certain conditions, exceed in magnitude 50 percent of tbe value sought.