研究目的
Design and development of a novel level transmitter utilizing lithium niobate (LiNbO3) Mach-Zehnder modulator for hazardous regions, focusing on liquid level measurement with low-cost and photonic-based transmission techniques.
研究成果
The proposed level transmitter is effective for liquid level measurement with advantages such as EMI-free transmission, long-distance capability, and reliability. It achieves sensitivities of 7.02 pF/cm from the sensor and -0.236 dBm/cm from the modulator, with good repeatability and linearity, making it suitable for industrial applications in hazardous regions.
研究不足
The method may have limitations in linearity and repeatability, with deviations up to ±5% in some parts, and the cost of optical components might be high initially, though durability could offset this.
1：Experimental Design and Method Selection:
The experiment involves using a capacitive sensor with copper parallel plates to measure liquid level, followed by signal conditioning to convert capacitance changes to electrical signals, and optical transmission using a Mach-Zehnder modulator. The design rationale is to achieve EMI-free transmission for hazardous areas.
2：Sample Selection and Data Sources:
Tap water is used as the liquid in a storage tank connected to a sensing tube made of acrylic material. Data is collected at different liquid levels in steps of 1 cm.
3：List of Experimental Equipment and Materials:
Includes LCR meter (NVIS 9304T), arbitrary function generator (SCIENTECH 417), digital multi-meter (Agilent U1241B), tunable laser source (OSICS ECL 1550 Tunable laser module), optical spectrum analyzer (MS9710B), optical power meter, Mach-Zehnder modulator (MXAN-LN-40), copper plates, acrylic sheet, and various electronic components for signal conditioning.
4：Experimental Procedures and Operational Workflow:
The liquid level is sensed by the capacitive sensor, capacitance is measured with LCR meter, the De'Sauty bridge is unbalanced by the capacitance change, output voltage is conditioned to 1-5 V DC, and this voltage modulates the optical input via the Mach-Zehnder modulator. Optical output is analyzed with OSA and power meter.
5：Data Analysis Methods:
Data is analyzed for linearity, repeatability, standard deviation, and uncertainty using statistical methods and equations provided in the paper.
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Digital multi-meter
Agilent U1241B
Agilent
Measures output voltage from the signal conditioning circuit.
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LCR meter
NVIS 9304T
NVIS
Measures capacitance changes from the sensor.
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Arbitrary function generator
SCIENTECH 417
SCIENTECH
Excites the De'Sauty bridge with a sinusoidal voltage.
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Tunable laser source
OSICS ECL 1550 Tunable laser module
OSICS
Provides optical input to the Mach-Zehnder modulator.
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Optical spectrum analyzer
MS9710B
Anritsu or unspecified (based on common knowledge, but not stated in paper)
Analyzes the optical output from the modulator.
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Optical power meter
Measures optical power output.
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Mach-Zehnder modulator
MXAN-LN-40
Photline
Modulates the optical signal based on the applied voltage for transmission.
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