A low-coherence light source interference experiment teaching demonstration device for simultaneous measurement of time domain and spectrum

Abstract

The invention discloses a low-coherence light source interference experiment teaching demonstration device for simultaneous measurement of time domain and spectrum, comprising: a wide-spectrum LED light source, an LD light source, an optional color filter turntable, a first flip frame, two apertures, a quasi- Straight system, first beam splitter, first reflector, second reflector, second beam splitter, spectrometer, second flip frame, photoelectric probe, area array CCD, data acquisition card, processor; first flip frame Firstly, the light from the collimated LD path is selected, and the light path is adjusted to be collimated, coaxial, and close to the equi-path point through the collimation diaphragm and the collimation system. Afterwards, the first flip frame selects the low-coherence wide-spectrum LED light source, and finds the equi-path point through the auxiliary judgment of the spectrometer. Scan near the equi-path point and observe the change of the spectral curve. Through the switching of the second flip frame, the CCD observes the spatial distribution of the interference fringes and the switching of the time-domain interference signal measurement mode is realized. The device can improve the comprehensiveness of low-coherence light source interference demonstration device and physical property demonstration of teaching.

Description

technical field [0001] The invention relates to the field of optical measurement and photoelectric detection, more specifically, to a low-coherence light source interference experiment teaching and demonstration device for simultaneous measurement of time domain and spectrum. Background technique [0002] Low-coherence interferometry technology has been widely used in various occasions, such as OCT medical imaging systems, Fourier spectrometers, these have developed mature commercial systems, but these instruments are very expensive on the one hand, and system integration on the other hand The height is high, which is not conducive to teaching demonstration. Understanding the low coherence of broadband light sources, including temporal coherence and spatial coherence, has always been a difficult point in teaching because of the abstract nature of its concept. Low-coherence interferometry technology is usually used to measure the thickness and refractive index of transparent...

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Problems solved by technology

[0004] In order to overcome the defects of the low-coherence light source interference demonstration device described in the prior art and the physical property demonstration of the teaching is not comprehensive enough, the present invention provides a low-coherence light source interference experiment teaching demonstration device for simultaneous measurement of time domain and spectrum

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