has function filter function material separation device obscuration bar obscuration bar Daniel Schober Flow Cytometry: First Principles, by Alice Longobardi Givan, ISBN-10: 0471382248, ISBN-13: 978-0471382249 John Quinn obscuration bar in a flow cytometer An obscuration bar is a an optical subsystem which is a strip of metal or other material that serves to block out direct light from the illuminating beam. The obscuration bar prevents the bright light scattered in the forward directions from burning out the collection device. metadata incomplete