Cushman, Darby & Cushman
Diesel smoke meter
 A diesel smoke meter which uses micro-waves to detect the density of black smoke contained in the exhaust gas discharged from the diesel engine through an exhaust pipe. A micro-wave transmitting device is coupled to the exhaust pipe and transmits micro-waves into the exhaust pipe. Micro-waves transiting the exhaust pipe are attenuated by the black smoke in the exhaust gas. A micro-wave receiving device receives the attenuated micro-waves and provides a received signal which varies in accordance with the signal level of the attenuated micro-waves. A measuring device receives the received signal and provides an output indicative of the density of black smoke in the exhaust gas. 
Nippondenso Co., Ltd. Nippon Soken, Inc.
G F G F
G01N F02B G01M F01N
inventional additional inventional inventional
Masao Takashi Shigeyuki Hiroshi Kunihiko
Kodera Sakurai Akita Mizuno Sasaki