Auto-focus spectrometer

An auto-focus spectrometer, comprising:

• a grating element configured to split light;
• an imaging element configured to converge a light beam;
• a controller configured to move the imaging element to realize autofocus, and connected to the imaging element;
• a detector;
• a collimating element configured to collimate light;
• a spectrometer housing;
• at least one incident slit and at least one outgoing slit that are provided on the spectrometer housing;
• an entrance optical element configured to allow the light passing through the incident slit to enter the collimating element;
• and
• an exit optical element configured to allow the light from the imaging element to enter the detector through the outgoing slit,
• wherein an incident light is diffracted through the grating to the imaging element, and then converged to the detector through the imaging element to obtain spectrogram information, the incident light is collimated through the collimating element and then reflected to the grating, the collimating element, the grating element, the imaging element and the controller are provided in the spectrometer housing, and the detector is provided on the spectrometer housing, the incident light enters the collimating element through one of the at least one incident slit and enters the detector through one of the at least one outgoing slit,
• wherein the controller is specifically configured to:
• acquire grating rotation angle data, a position of the entrance optical element and a position of the exit optical element;
• determine a rotation angle position graph based on the position of the entrance optical element and the position of the exit optical element;
• determine an optimal imaging element position from the rotation angle position graph based on the grating rotation angle data;
• and
• move the imaging element according to the optimal imaging element position to realize autofocus.