| 摘要 |
The present invention discloses an optical measurement method and apparatus for long-term and continuous monitoring of liquid concentration. The method comprises: (1) selecting two different wavelengths » ' and » " according to standard curves for the absorptivity of a testing solution and a reference solution, wherein the two solutions have different absorptivity at the same wavelength; (2) dividing a chamber with fixed optical path length into a chamber for the testing solution and a chamber for the reference solution using a light transmissive device, and injecting the testing solution and the reference solution into the chambers respectively; (3) entering, by a parallel light, from one end of the chamber with fixed optical path length, passing the testing solution, the light transmissive device and the reference solution, and then exiting from the other end, and recording intensity of emerging light at the wavelength » ' and » " at the moment; (4) while keeping the light pass through the testing solution, the light transmissive device and the reference solution and maintaining pressure of the testing solution and the reference solution unchanged, moving the light transmissive device to change the light path lengths of the testing solution and the reference solution, and recording intensity of emerging light at the wavelength » ' and » " at the moment; (5) obtaining current concentration of the testing solution by following formula: |
