Fig. 1. Schematic diagram of single channel absorbance detection

Fig. 2. Schematic diagram of phase-locked amplifier

Fig. 3. Single channel optical system structure diagram

Fig. 4. Schematic diagram of total irradiance distribution on detector target surface

Fig. 5. Layout of single chip microcomputer control circuit

Fig. 6. Single channel optical mechanical structure profile

Fig. 7. Internal structure diagram of sensor

Fig. 8. Picture of sensor assembly

Fig. 9. Schematic diagram of single integration module

Fig. 10. Comparison between Absorbance sensor and VIPER

Fig. 11. Schematic diagram of sensor integration module towing in water

Fig. 12. Absorbance profile data of some waters in the South China Sea