Methods of detecting latent stains on a surface

摘要

Methods for identifying chemical contrasts on a common surface are generally provided. The presence of a stain on a surface can be detected by applying a testing vapor, such as water, onto the surface and monitoring the surface with an infrared camera that detects wavelengths of about 700 nm to about 1 mm and/or a microbolometer that detects wavelengths of about 7.5 μm to about 14 μm. The surface may be at room temperature or preheated during the detection method.

主权项

1. A method for detecting a chemical contrast on a surface, the method comprising: heating the surface with a testing vapor from an initial temperature to a peak temperature, allowing the surface to cool from the peak temperature to the initial temperature, and monitoring the surface with a temperature measuring instrument during heating, wherein any portion of the surface that heats differently than the remaining portion of the surface indicates a stain is present, and wherein the temperature measuring instrument comprises an infrared camera or a microbolometer.