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Additional info for 30.Instrumentation and Measurement
A list of manufacturers of accelerometers is supplied in Table 1. In deciding about the application type, for example, general purpose or special, and the accelerometer to be employed, the following characteristics need to be considered: the transient response or cross-axis sensitivity; frequency range, sensitivity, mass and dynamic range; cross-axis response; and environmental conditions, temperature, cable noise, stability of bias, scale factor, and misalignment. Some useful hints about these characteristics will be given below.
Often, short duration and sudden occurrence vibrations need to be measured. Shock and transient vibrations may be described in terms of force, acceleration, velocity, or displacement. As in the case of random transients and shocks, statistical methods and Fourier transforms are used in the analysis. Nonstationary Random Vibrations. In this case, the statistical properties of vibrations vary in time. Methods such as (42) where f(t) is the force, m the mass, c the velocity constant, and k the spring constant.
Manufacturers also supply information on these two characteristics. Environmental Conditions. In selection and implementation of accelerometers, environmental conditions such as temperature ranges, temperature transients, cable noise, magnetic field effects, humidity, and acoustic noise need to be considered. Manufacturers supply information on environmental conditions. SIGNAL CONDITIONING Common signal conditioners are appropriate for interfacing accelerometers to computers or other instruments for further signal processing.