Common mode rejection circuits could compensate for the variation but the concept would need to be thoroughly tested. A researcher for the Texas Department of Highways tried a passive infrared detector in a vehicle counting application. ... of Appendix B. The graph in Figure 4 is a typical vehicle signal or aquot; signatureaquot; and the diagram on the right is its fast Fourier transformation to the frequency domain.
|Title||:||Automatic Turning Movement Counter|