Optical sensor device, colorimetric device, and image forming apparatus

An optical sensor device comprising:

• a first light source having a plurality of peak wavelengths in a wavelength range of from 400 nm to 780 nm;
• a second light source to emit ultraviolet light;
• a sensor to receive light emitted by the first light source or the second light source and reflected by an object;
• and
• control circuitry to:
• adjust a light amount of the first light source based on an output of the sensor in a state where the first light source is turned on and the second light source is turned off;
• adjust a light amount of the second light source based on an output of the sensor in a state where the second light source is turned on and the first light source is turned off;
• and
• acquire a correction value of data output by the sensor, based on an output of the sensor in a state where each of the first light source and the second light source is turned on with the light amount adjusted by the control circuitry.