Multi-channel array spectrometer and method for using the same

A multi-channel array spectrometer, comprising:

• a housing including an entrance slit, a bandpass filter wheel holding a set of bandpass filters and an open hole, at least one grating and at least one array detector;
• a light collection means mechanically connected to said housing;
• an optical path extending from said light collection means to the array detector in said housing;
• a driving mechanism being mechanically connected to the bandpass filter wheel which drives the bandpass filter wheel so that one of the bandpass filters or the open hole is switched into the optical path;
• a microprocessor being electrically connected to the array detector and the driving mechanism.

A measurement method for using a multi-channel array spectrometer, comprising:

• (a) measuring a typical test light source band by band, including:
• rotating a bandpass filter wheel, the light beam of the typical test source passing through the bandpass filters in turn so that a measured spectral intensity of the typical test light source is calculated by:
• Pi(λ)t=Ci(λ)·Mi(λ), wherein Ci(λ) refers to calibration coefficients of a standard light source having passed through a number i bandpass filter, Mi(λ) refers to responsivities of the spectrometer to a typical test light source at wavelength λ, obtaining a low stray light spectral intensity distribution of an entire wavelength range P(λ)t being obtained by combining values of Pi(λ)t;
• (b) quickly measuring an entire spectra of the typical test light source simultaneously while light beam of the typical test light source does not pass through any of the bandpass filters in the bandpass filter wheel, spectral power distribution of the typical test light source being P0(λ)t=C0(λ)M0(λ)t, wherein C0(λ) is a calibration coefficient of the standard light source, and M0(λ)t is responsivities of an multi-channel array spectrometer to the typical test light source.
• (c) calculating a stray light correction factor k(λ)stray by results of (a) and (b);
• (d) repeating (b) to measure similar test light sources, which have a similar spectral power distribution as the typical test light source, obtaining spectral power distribution of the similar test light sources as P0(λ)u, then correcting the resulted spectral power distribution of the similar test light sources by the stray light correction factor k(λ)stray to get P(λ)u as a low stray light spectral power distribution of the similar test light sources.