Method for realizing low-light level great visual field spectral measurement

Abstract

The invention relates to a spectrometry technique, in particular to a method which realizes spectrometry of low illumination and wide view. According to the technical scheme provided by the invention, an integral bar is arranged between the spectrum collection lens and the spectrum instrumentation incidence window; wherein, one end of the integral bar pointing at the spectrum collection lens is an integral bar incidence window, while the other end of the integral bar pointing at the spectrum instrumentation incidence window is an integral bar emergent window; after focused by spectrum collection lens lighting ray enters into the integral bar through the integral bar incidence window, and then the lighting ray enters into the spectrum instrumentation incidence window through the integral bar emergent window. The invention mixes lighting by adopting an integral bar, the mixture and transmission of lighting is implemented by utilizing the total reflection of an integral bar, thus realizing wide view optical coupling while prominently increasing the proportion of collecting light energy of spectrum instrumentation, long-distance and wide view spectrometry of field scenery reflecting spectrum and low illumination fluorescence object is realized.

Description

technical field [0001] The invention relates to a spectral measurement technology, in particular to a method for realizing low-illuminance large-field spectral measurement. Background technique [0002] With the development of sensor technology, computer technology and spectral measurement technology, the design and production of small portable spectral measurement instruments have become a reality, which has led to the rapid development of field spectral measurement applications. However, due to the miniaturization of instruments and the need for spectral measurement accuracy, the size of the collection window of the spectrometer is becoming smaller and smaller, and even the optical fiber is directly used as the collection channel of spectral energy, which brings difficulties to the optical coupling of long-distance large-field spectral measurement. [0003] Such as figure 1 As shown: the large field of view optical system will form a larger image on the coupling surface o...

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Problems solved by technology

However, even if the loss of light energy caused by multiple reflections in the integrating sphere is not considered, the luminous flux received by the exit window is only equal to the ratio of the incident luminous flux multiplied by the area of ​​the exit window to the area of ​​the sphere, so for illuminants with low brightness and outdoor scenes The measurement requirements of low-brightness environments such as reflectance spectra are powerless

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