Abstract
Some reasons for use of varied measurement techniques in internal-combustion engine development are given and the broad principles of transducers are discussed. It is emphasized that the treatment is based on the practice and experiences of one organization and does not claim to be a critical survey of all possible methods. Practical examples of pressure, movement, strain and vibration measuring systems are given with reasons for choice of the method used. Some experiences with strain gauges in special circumstances are mentioned. Normal temperature measurements are not discussed but certain particular cases, such as differential thermo-meters and probes for dynamic measurement, are mentioned. The many uses of scaling or counting equipment are outlined with some examples, such as accurate tachometry. The visual display units and photographic recording gear used to present the output from transducers are described, together with some mention of driver amplifiers and carrier systems which are also needed. The problems of time sweep generators and marker pulses are presented together with an outline of better solutions not yet achieved.
The final section mentions some responsibilities of the instrument section outside the scope of the paper and refers to general principles guiding the operation and staffing of such a section and its position as a service to the basic purposes of the organization as a whole.
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