In order to overcome the error introduced by single wavelength calibration

a parallel acquisition and feature extraction method is proposed for multi-feature wavelength. Based on the analysis of phase error causes

an improved Mertz method was designed for multi-spectral data acquisition. In this algorithm

the parameters in different registers of the DSP are alternated. It realizes the adjustment of the different characteristic wavelength correction parameters and suppresses the phase error caused by the zero offset. The experimental system was constructed by DSP6713

Roper's high-speed linear array CCD

static interference tool and focusing lens group. The center wavelengths of the system test laser were 632.0

650.0 and 660.0 nm

respectively. Finally

the test results of this algorithm are compared with the experimental data. The results show that: ① Compared with the traditional calibration method

the characteristic peak is more obvious

the side lobes are smaller

and the signal-to-noise ratio is improved. ② Compared with the test data of the TENSOR-27 spectrometer

the mean of noise dropped from -30 dB to -32 dB.