Detection device

A detection device comprising:

• a sensor panel that has a detection area in which a plurality of optical sensors are two-dimensionally arranged;
• a light source configured to emit light;
• a member on which an object to be detected is to be placed so that the object to be detected is interposed between the detection area and the light source;
• and
• a control circuit configured to control operations of the sensor panel and the light source and perform processing based on outputs of the optical sensors, wherein
• the object to be detected is provided with a culture medium capable of culturing a colony,
• the control circuit is configured to:
• perform an acquisition process to operate the light source to generate light traveling toward the sensor panel after the placement of the object to be detected, and acquire the outputs of the sensor panel corresponding to an intensity of the light detected by the optical sensors;
• repeat the acquisition process at intervals of a predetermined waiting time;
• and
• perform a comparison process to compare a first output that is the outputs of the sensor panel obtained in the first acquisition process with a second output that is the outputs of the sensor panel obtained in the latest acquisition process,
• the comparison process comprises:
• a first comparison process to compare the first output with the second output for each output from each of the optical sensors;
• and
• a second comparison process to compare the first output with the second output for each output from an area that includes one optical sensor and other optical sensors located around the one optical sensor,
• the control circuit is configured to determine the outputs of the optical sensors that satisfy a first condition and a second condition to be the outputs of the optical sensors that overlap the colony,
• the first condition is that a difference between the first output and the second output is a predetermined difference or larger in the first comparison process, and
• the second condition is that, when the optical sensor determined to satisfy the first condition is set as the one optical sensor, the difference between the first output and the second output is the predetermined difference or larger in the second comparison process.