A U.S. Patent for a “Particle Sensor with Interferent Discrimination” was awarded to BugLab on September 10th, 2019. The present invention provides methods and devices to measure particle suspension concentrations in the presence of potential interferents. Particle back-scatter readings are taken at light wavelengths that are absorbed by the medium before interacting with surrounding objects. Source-detector spacings are minimized compared to the mean absorbance path length of light, thereby maximizing the range of sensitivity to particle concentration. The active discrimination against potentially interfering particles, such as bubbles, is provided. Learn More