| 摘要 |
A spectral scanning-based distributed physical quantity detection method and a device thereof. The method comprises the following steps: 1) a signal is transmitted at equifrequency intervals to a measured object: f = 1Δf, 2Δf, 3Δf, …, nΔf, where f is a scanning frequency and Δf is a frequency interval; 2) a signal receiver circuit receives from the measured object a frequency domain response X(f): X(1Δf), X(2Δf), X(3Δf), …, X(nΔf); 3) inversion and translation steps are performed in the frequency domain to produce X3(f); 4) an inverse discrete Fourier transform is performed on X3(f) to produce x3(t); and, 5) produced from x3(t) is a measurement result, that is, a time domain signal, x(t). The detection method and the device thereof obviate the need for transmitting an intense pulse, have low requirements on components, obviate the need for measuring a direct current component in a spectrum, and obviate the need for direct current calibration or compensation; therefore, the difficulty faced when measuring the direct current component in a spectrum is completely avoided, and errors caused by a systemic direct current shift are eliminated. |
