Optical probe device for analyzing component of underwater substance and method of analyzing component of underwater substance by using the same

An optical probe device for analyzing a component of an underwater substance, the optical probe device comprising:

• a light source configured to emit excitation light;
• a sensor configured to emit the excitation light into underwater and collect scattered light scattered from the underwater;
• a spectrometer configured to analyze the scattered light;
• an optical fiber assembly configured to connect the light source to the sensor, and the sensor to the spectrometer;
• and
• a cap having an opening on one side, configured to receive the sensor therein, and configured to allow an air layer inside the opening to separate the sensor from an underwater environment when the opening is lowered and submerged in the underwater in a state where the opening is disposed to cover a water surface;
• wherein the sensor includes:
• a collimator configured to convert the excitation light into parallel light, and to collect the scattered light;
• and
• a focusing optics disposed in front of the collimator and configured to collect the parallel light converted by the collimator and to convert the scattered light scattered underwater into parallel light, and
• wherein:
• an edge of the cap defining the opening is located between the focusing optics and a focal point focused by the focusing optics;
• a water surface detection sensor provided at a distal end of the cap and configured to detect whether the cap has been in contact with a water surface;
• and
• the sensor rises by a preset distance to detect a substance on the water surface when the water surface detection sensor detects that the cap is in contact with the water surface.