| 摘要 |
PROBLEM TO BE SOLVED: To obtain an image with a high contrast that can be recognized to the details by emitting a pulse beam with a prescribed period and a sinusoidal wave electromagnetic wave with a millimeter wave band frequency where a different frequency has been added to a first frequency, and detecting the phase difference between an electrical signal, where the pulse beam through an object is subjected to photoelectric conversion and a reference sinusoidal wave. SOLUTION: A millimeter wave 16 emitted from an antenna 12 is transmitted through a sample object 13 and is received by an electrochemical crystal 10. A pulse beam emitted from a laser 4 is transmitted through a PBS(polarization beam splitter) 6 for taking out a first polarization component, is transmitted through a HWP(half-wave plate) 7 and a QWP(quarter-wave plate) 8, and is reflected by a mirror 9 and enters the electrochemical crystal 10. A pulse beam that is reflected by an optical reflection film 11, while a second polarization component is generated enters a PD-L (photodiode) 5 from a PBS 6. The strength of an electrical signal extracted by a lock-in amplifier 15 is processed by a computer 14 and is used as the data of the millimeter wave intensity distribution image of the sample object 13.
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