| 摘要 |
FIELD: measurement technology. SUBSTANCE: device has two modulated optical radiation sources, optical coupling elements, photodetector, focusing element, microscope stage, photo-emf sensor with capacitive coupling electrode and preamplifier, two power amplifiers, two-channel generator, two recorders. Device may have two synchronous detectors, differential amplifier, unmodulated radiation source for illuminating object under check, and also more than two radiation sources and electronic units. Lasers and/or light-emitting diodes may be used as radiation sources. EFFECT: improved reliability of device. 7 cl, 4 dwg |
