A smart load-sensing system using standardized mechano-luminescence measurement

Area of Science:

• Materials Science
• Solid State Physics
• Sensor Technology

Background:

• Mechano-luminescence (ML) in phosphors is explored for cost-effective, non-destructive load sensing.
• A significant limitation of ML phosphors is inconsistent responses under varying loading conditions, hindering standardization.
• This inconsistency prevents the realization of reliable smart ML sensor applications.

Purpose of the Study:

• To enhance the applicability of ML phosphors for standardized smart load sensors.
• To develop a novel detection method for ML under specific UV excitation conditions.
• To establish a reliable and standardized method for load sensing using ML phosphors.

Main Methods:

• Phosphor ML was detected using UV excitation above a threshold power density throughout the loading process.
• The ML output was measured under both static and dynamic loading conditions.
• ML behavior was analyzed for linearity, loss angle, and hysteresis.

Main Results:

• ML detection under continuous UV excitation above threshold yielded distinct behavior compared to conventional methods.
• The ML output demonstrated a clear linear relationship with the applied load, applicable to both static and dynamic conditions.
• No ML loss angle or hysteresis was observed under the implemented ML measurement conditions.

Conclusions:

• Continuous UV excitation above a threshold power density enables standardized and reliable ML-based load sensing.
• The linear response and absence of hysteresis/loss angle confirm the potential for smart, standardized ML sensor applications.
• This improved ML detection method overcomes previous limitations, paving the way for practical load sensor development.