Fluorescent sensor and sensor system

A sensor system, comprising:

• a needle-type sensor having, on a needle head:
• a detecting substrate possessing a first main surface, a second main surface, and a through hole, the through-hole penetrating the first and second main surfaces, the first and second main surfaces each possessing an opening;
• a first photoelectric conversion element configured to convert fluorescence into an electric signal being positioned in a wall surface of the through-hole;
• a second photoelectric conversion element being positioned in the second main surface;
• an indicator arranged inside the through-hole and configured to react to an analyte and generate the fluorescence of intensity corresponding to a density of the analyte when the indicator receives an excitation light;
• a light blocking layer covering the opening of the first main surface of the through-hole, the analyte passing through the light blocking layer;
• and
• a luminous element chip covering the region below the opening of the second main surface and a region below the second photoelectric conversion element, and is configured to generate the excitation light;
• and
• a processing unit configured to correct the electric signal from the photoelectric conversion element by using an electric signal from the second photoelectric conversion element.

A fluorescent sensor, comprising:

• a detecting substrate possessing a first main surface, a second main surface, and a through hole, the through-hole possessing one end opening to the first main surface and an other end opening to the second main surface;
• the through-hole axially extending from the first main surface to the second main surface and being surrounded by a wall surface;
• a photoelectric conversion element being configured to convert fluorescence into an electric signal, the photoelectric conversion element being positioned at the wall surface of the through-hole;
• an indicator arranged inside the through-hole and configured to generate the fluorescence at an intensity corresponding to an analyte density when the indicator receives excitation light, the photoelectric conversion element positioned in the wall surface at least partially encircling the indicator;
• a filter layer covering the photoelectric conversion element and configured to transmit the fluorescence and block the excitation light;
• a light blocking layer covering the end of the through-hole that opens to the first main surface, the analyte passing through the light blocking layer;
• and
• a luminous element chip being configured to generate the excitation light, the luminous element chip covering the other end of the through-hole that opens to the second main surface.