Patent ID: 10866141

Abstract:
The invention relates to a device for the spectral analysis of an electromagnetic measurement signal using an optoelectronic mixer, wherein the optoelectronic mixer is designed to generate the electrical superimposition signal by superimposing the electromagnetic measurement signal and a reference signal with at least one known frequency (fo). The device comprises the following features: a signal input for receiving an electrical superimposition signal from the optoelectronic mixer, a low-pass filter, a rectifier, and a read-out unit. The low-pass filter is designed to generate a filtered superimposition signal from the electrical superimposition signal by filtering out frequency portions above an upper cutoff frequency (fG). The rectifier is designed to generate a rectified superimposition signal from the filtered superimposition signal. The read-out unit is designed to determine a match of the known frequency (fo) of the reference signal with the electromagnetic measurement signal based on the rectified overlay signal.