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Vehicular Instrumentation

This paper discusses the necessity of wireless transducers in vehicular test instrumentation, focusing on both long-term and short-term applications. Long-term wireless applications reduce the recurring maintenance costs versus traditional cabling solutions like slip rings, especially in situations involving rotating components such as helicopter rotors and wheels. Short-term applications minimize installation overhead for temporary test setups. The document also addresses critical factors like sample rates, time-stamping accuracy, and challenges including RF interference.

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Vehicular Instrumentation

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  1. Vehicular Instrumentation Lee H. Eccles The need for wireless transducers in Vehicular Test Instrumentation

  2. Long term wireless applications • These applications are long term applications where the cost of recurring maintenance (i.e. batteries) is less than the cost of things like slip rings. • For some applications the weight of cabling makes wireless desirable. • Instrumentation of rotating parts • Rotating shafts • Helicopter rotors • Wheels/tires • Etc. Boston Sensors Expo 2002

  3. Short term wireless applications • This class of applications is characterized by the need to install test instrumentation on a vehicle for a short period of time. • The cost of maintenance is less than the cost of installing cables for the application. • The cost of installing cables is highly application dependent. Boston Sensors Expo 2002

  4. Application characteristics • Distances are limited by the size of the vehicle. • Sample rates vary from one Hz to 20,000 Hz. • Occasionally higher sample rates are required • Test duration varies from a few seconds to many hours. • Synchronous sampling is desirable. • Secure communications will be required in many applications. Boston Sensors Expo 2002

  5. Time Stamping Requirements • Time Stamping the time a sample was taken is required. • Time stamp accuracy and resolution vary with the application. • The system should be capable of providing resolution to at least 200 nanoseconds. • The relative accuracy requirement is similar. Boston Sensors Expo 2002

  6. Issues • RF interference is an issue on many vehicles, particularly aircraft. • In some applications it will be possible to cable power to the transducer and transmit the data wireless. Boston Sensors Expo 2002

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