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Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...

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Real-Time Optical Fiber Salinity Interrogator Based on Time-Domain Demodulation and TPMF Incorporated Sagnac

Weihao Lin1,2, Fang Zhao3, Jie Hu3

  • 1The Higher Educational Key Laboratory for Flexible Manufacturing Equipment Integration of Fujian Province, Xiamen Institute of Technology, Xiamen 361021, China.

Sensors (Basel, Switzerland)
|August 29, 2024
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Summary
This summary is machine-generated.

This study introduces a novel fiber optic sensor for real-time salinity monitoring. It uses a Sagnac interferometer and optical time stretching for enhanced sensitivity and a faster response rate.

Keywords:
Sagnac interferometerdispersion compensation fiberoptical time stretching technologysalinity monitoringtapered polarization-maintaining fiber

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Area of Science:

  • Optoelectronics
  • Fiber Optics Sensing
  • Environmental Monitoring

Background:

  • Traditional fiber optic sensors for salinity monitoring often have slow response rates.
  • Enhancing evanescent field interaction is key for sensitive salinity detection.

Purpose of the Study:

  • To develop a novel demodulation scheme for a point-type fiber sensor for salinity concentration monitoring.
  • To improve the response rate and sensitivity of fiber optic salinity sensors.

Main Methods:

  • A Sagnac interferometer (SI) was constructed using a tapered polarization-maintaining fiber (TPMF).
  • Optical time stretching technology and dispersion compensation fiber (DCF) were employed for signal demodulation.
  • The sensor's performance was evaluated by analyzing SI reflection spectra and time-domain shifts.

Main Results:

  • The SI demonstrated enhanced evanescent field interaction, intensifying light-salinity interaction.
  • The sensor achieved a sensitivity of 0.151 nm/‱ in the spectral domain.
  • A time-domain sensitivity of -0.15 ns/‱ was recorded with a demodulation rate up to 50 MHz.

Conclusions:

  • The novel demodulation scheme enables real-time salinity monitoring with high sensitivity and rapid response.
  • The developed sensor shows significant potential for remote ocean salinity monitoring applications.
  • Translating spectral shifts to the time domain offers an advantage over traditional spectral demodulation methods.