Signal broadening refers to the phenomenon where a signal, such as an optical or acoustic wave, spreads out over time or distance, often due to dispersion or interference. This can lead to a loss of resolution or clarity in systems like telecommunications, spectroscopy, and imaging, necessitating corrective measures to maintain signal integrity.
Permissible Exposure Limit (PEL) is a regulatory limit on the amount or concentration of a substance in the air, established to protect workers' health over a specified time period. Set by agencies like OSHA, these limits are essential for ensuring workplace safety and preventing occupational illnesses.
The Biological Exposure Index (BEI) is a guidance value for assessing potential health risks by measuring specific chemicals or their metabolites in biological specimens, reflecting an individual's exposure to workplace chemicals. BEIs help in evaluating the effectiveness of protective measures and ensuring occupational safety by providing a benchmark for acceptable levels of chemical exposure in the body.