News Articles
Michelson Interferometry (ASTM E289) versus Pushrod Dilatometry (ASTM E228)
Michelson Interferometry (ASTM E289) compared to Pushrod Dilatometry (ASTM E228) What is similar between Interferometry and Dilatometry? For both methods, the Coefficient of Thermal Expansion (CTE) is measured continuously over the entire temperature range, and data are reported every 1 °C or 1 minute. Which method is better for measuring the CTE of your material?…
Importance of Coefficient of Moisture Expansion (CME) Testing
Importance of Coefficient of Moisture Expansion (CME) Testing What is Coefficient of Moisture Expansion (CME)? The CME of a material is determined by measuring the moisture content and strain change between two moisture equilibrium states. It is expressed as the change in strain per unit mass change between the two moisture states. Why do you…
Thermal Diffusivity and Conductivity via Flash Method
Thermal Diffusivity and Conductivity via Flash Method PMIC recommends thermal diffusivity testing using the flash method for design applications, process control, quality assurance, and high sample throughput measurements. The flash method is invaluable as a relatively inexpensive, fast test method, usually requiring only a small amount of material for testing. PMIC introduced a TA…
Edge and End Effects of Low-Expansion Composites in Thermal Expansion Measurements
Edge and End Effects of Low-Expansion in Thermal Expansion Measurements Low-expansion graphite composites such as graphite face sheets, honeycomb panels, and similar materials have what PMIC refers to as edge and end effects, roughly depicted in Figure 1. These effects negatively influence length change measurement in Coefficient of Thermal Expansion (CTE) testing. For graphite…
Artemis Program and SPACECOM
Artemis Program and SPACECOM In November, Precision Measurements and Instruments Corporation attended SPACECOM in Houston, Texas. During this conference, numerous groups ranging from NASA to the Department of Energy discussed tactical matters impacting the commercial space industry. Part of the conference included NASA Theatre sessions where contacts from NASA discussed their upcoming missions, one of…