Spectrometer

A spectrometer that irradiates a measurement light to a sample, detects a light that transmits or reflects the sample or a light that is emitted from the sample by a detector, and calculates a spectral information of the sample based on a detected signal containing the spectral information of the sample, the spectrometer comprising:

• a data processor that
• acquires the detected signals repetitively,
• calculates a preliminary spectral information of the sample based on at least n (n:
• an integer of 1 or greater) of the latest detected signals and a background (BKG) information acquired and retained in advance in a state without the sample or a state which irradiation of the measurement light is stopped, and retains the preliminary spectral information,
• calculates the preliminary spectral information of the sample based on at least n of the latest detected signal and the BKG information again, and updates the retained preliminary spectral information, and
• repeats calculation of the preliminary spectral information and update thereof;
• and
• a display that displays the preliminary spectral information retained and updated in the data processor on a graph having a wavenumber range or a wavelength range on one axis and a spectral intensity value on the other axis in real time,
• wherein the data processor starts integration of N (N:
• an integer greater than n) of the detected signals while the preliminary spectral information is graphically displayed in real time, and acquires the spectral information of the sample based on an integrated value thereof.