A frequency which can be easily identified and measured in a given emission

Related Terms

HARMONIC

1. A sinusoidal quantity having a frequency that is an integral multiple of the frequency of a periodic quantity to which it is related. 2. A signal having a frequency which is an integral multiple of the fundamental frequency.

CATALYTIC CONVERTER

An integral part of vehicle emission control systems since 1975. Oxidizing converters remove hydrocarbons and carbon monoxide (CO) from exhaust gases, while reducing converters control nitrogen oxide (NOx) emissions. Both use noble metal (platinum, palladium or rhodium) catalysts that can be 'poisoned' by lead compounds in the fuel or lubricant.

POSITIVE CRANKCASE VENTILATION (PCV)

System for removing blow-by gases from the crankcase and returning them through the intake manifold to the combustion chamber where the recirculated hydrocarbons are burned. A PCV valve controls the flow of gases from the crankcase to reduce hydrocarbon emissions.

INCANDESCENCE

Emission of light due to high temperature. Any other emission of light is called LUMINESCENCE.

INFRASONIC

Having a frequency below the audible range. Frequencies above the audible range are called ULTRASONIC.

IN-BAND RACON

A racon which transmits in the marine radar frequency band. There are two types of in-band racons, swept-frequency racons and experimental fixed-frequency racons. The transmitter of the sweptfrequency racon sweeps through a range of frequencies within the band to insure that a radar receiver tuned to a particular frequency within the band will be able to detect the signal. The fixed-frequency racon transmits on

NATURAL FREQUENCY

The lowest resonant frequency of a body or system.

TECHNICAL FILE

A record containing all details of parameters, including components and settings of an engine, which may influence the NOx emission of the engine.

RECORD BOOK OF ENGINE PARAMETERS

The document for recording all parameter changes, including components and engine settings, which may influence NOx emission of the engine.

EMISSION

The gases and airborne particles produced during combustion.

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