Laser Tracker Atmospheric Error Compensation Procedures
Compensate laser tracker atmospheric error using Edlen index calculations, distributed sensor arrays, and line-integral math to eliminate scale bias.
Thermal Stratification
Meaning
Phenomenon in which air within an enclosure separates into horizontal layers based on temperature. Thermal stratification occurs because hot air is less dense than cold air and rises to the top of the cabinet. This creates a temperature gradient where components at the top are exposed to much higher heat than those at the bottom.
Airflow Obstruction
Internal cables and large components can block the natural movement of air and reinforce these layers. Without active mixing, the hot air becomes trapped in stagnant pockets near the ceiling of the device. This situation can lead to the premature failure of sensitive components located in the upper sections.
Cooling Efficiency
Standard fans often pull air through the middle of an enclosure, which might leave the top layer undisturbed. Designers must use baffles or directed vents to break up the thermal stratification and ensure a uniform temperature. Measuring the temperature at multiple heights is necessary to verify that the cooling system is effective.
Sensors placed at various levels help confirm that the entire volume is receiving adequate airflow to prevent hot spots.
System Layout
Placing the most heat sensitive parts near the bottom of the enclosure takes advantage of the cooler air. Power supplies and other heat generators are often placed at the top so that their heat is exhausted immediately. This arrangement prevents the heat from the power supply from warming the rest of the system.