Sensor Failure Detection in Road Tunnel Ventilation
Sensor Failure Detection in Road Tunnel Ventilation
Sensor Failure Detection in Road Tunnel Ventilation
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2. <strong>Sensor</strong> <strong>Failure</strong>s<br />
2.1 Typical <strong>Failure</strong> <strong>in</strong> Traffic Counter (“TC”)<br />
- Loop detector TC performance go<strong>in</strong>g down due to wear and tear.<br />
- Laser detector TC performance go<strong>in</strong>g down due to wear and tear.<br />
- Video TC performance go<strong>in</strong>g down under bad weather conditions<br />
such as heavy ra<strong>in</strong> and snow.<br />
2.2 Typical <strong>Failure</strong> <strong>in</strong> Air Velocity (“AV”) Meter<br />
- Measurements affected by the air flow disturbance due to vehicle<br />
movement <strong>in</strong> local AV meter.<br />
- Measurements disrupted by traffic congestion <strong>in</strong> cross sectional AV<br />
meter.<br />
2.3 Typical <strong>Failure</strong> <strong>in</strong> Pollution Concentration (“VI”, “CO”)<br />
- W<strong>in</strong>dows <strong>in</strong> VI meter affected by dust and contam<strong>in</strong>ants.<br />
- Screen <strong>in</strong> CO meter catch<strong>in</strong>g dust.
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