清住君（OB）の論文が IEEE Transactions on Instrumentation and Measurement に受理されました。

光相関領域計測におけるビートスペクトルを定式化し、離散フーリエ変換により計算する手法を提案した清住君（OB、特別研究学生、東大D3）の論文が、IEEE Transactions on Instrumentation and Measurement に受理されました。

T. Kiyozumi, K. Noda, S. Yoshida, Y. Higa, S. Y. Set, Y. Mizuno, and S. Yamashita, “Delayed self-heterodyne spectra under arbitrary periodic frequency modulation for optical correlation-domain measurement,” IEEE Trans. Instrum. Meas., accepted.

This paper presents a method for deriving the delayed self-heterodyne spectrum of light under arbitrary periodic frequency modulation, referred to as the “beat spectrum” in optical correlation-domain measurement. The beat spectrum is analytically formulated for arbitrary periodic modulation waveforms, and a numerical calculation method based on the discrete Fourier transform (DFT) is proposed. Unlike the conventional histogram method, the proposed method explicitly accounts for the modulation frequency and the phase noise of the light source. The method is experimentally evaluated using sinusoidal, rectangular, triangular, double-modulation, and periodic pseudo-random modulation signals. The DFT-based predictions reproduce spectral features that are not adequately captured by the histogram method, with the degree of agreement between measured and calculated spectra depending on the modulation waveform. The resulting framework provides a basis for analyzing periodic modulation waveforms in correlation-domain measurement.