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TASCO Exit Exam • Set 4 Question 4 of 30

Operating Principle of the Infrared instrument: identify the key principle that leads to detection of hydrocarbon gas,

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Direct Answer

Option D: The gas absorbs some of the infrared wavelengths as the light passes through it, while others pass through it completely unattenuated.

Infrared (IR) sensors work by measuring the absorption of specific infrared light wavelengths as they pass through the gas. Hydrocarbons absorb specific IR frequencies, allowing the concentration to be calculated.

All Options

A
The vapor to be monitored reaches the measuring chamber by diffusion or by means of a pump.
B
The infra-red (IR) sensor is a transducer for the measurement of the concentration of hydrocarbons by the absorption of infra-red radiation.
C
An infrared source illuminates a volume of gas that has entered inside the measurement chamber.
D
The gas absorbs some of the infrared wavelengths as the light passes through it, while others pass through it completely unattenuated. (Correct Answer)

Detailed Explanation & Context

Infrared (IR) sensors work by measuring the absorption of specific infrared light wavelengths as they pass through the gas. Hydrocarbons absorb specific IR frequencies, allowing the concentration to be calculated.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Oil Tanker Cargo Operations (TASCO).

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