Patent ID: 11933772
Assignee: SHIMADZU CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 1:
2. An absorbance detector for a chromatograph comprising:
a light source;
a flow cell that receives light generated by the light source;
a photodetector that detects light transmitted through the flow cell;
a light shield member that shields at least part of the light generated from the light source to the flow cell;
a motor that rotates the light shield member to change the light shield member between a light-shielding state where the light shield member shields at least part of the light generated from the light source to the flow cell and a non-light-shielding state where the light shield member does not shield the light generated from the light source to the flow cell; and
a reference position detector that rotates the motor and also acquires a change in amount of light received by the photodetector to detect a reference position of the light shield member in a rotation direction of the light shield member based on the acquired change in the amount of the received light,
wherein the reference position detector acquires the change in the amount of the light received by the photodetector to detect the reference position of the light shield member in the rotation direction of the light shield member based on the acquired change in the amount of the received light while the light shield member makes one rotation.