DEVICE FOR DETECTING IMPURITIES IN POWDER USING TERAHERTZ PULSE WAVES, AND METHOD FOR DETECTING IMPURITIES

摘要

The present invention includes an oscillating unit (11), an optical system (12), a receiving unit (13), a scanning mechanism (14), and an operator (15). The oscillating unit (11) is configured to generate a terahertz pulse wave and emit the terahertz pulse wave as irradiation light. The optical system (12) is configured to guide the irradiation light to the first part of the container and condense reflected light from the container. The receiving unit (13) is configured to output a signal corresponding to the condensed reflected light and also measure an echo. The scanning mechanism (14) is configured to scan a position of the irradiation light guided on the first part in a two-dimensional manner. The operator (15) is configured to detect a foreign matter (21) in powder in a container (20) based on at least one of a time waveform signal, a reflection image, a power spectrum, a tomographic image, and a frequency image. The time waveform signal is output from the receiving unit in chronological order.