研究目的
To develop a method of an electro-optic dual-comb Doppler velocimeter, making the velocity measurement results able to be traced directly back to a rubidium atomic clock.
研究成果
The proposed electro-optic dual-comb Doppler velocimeter is feasible and can improve velocity measurement accuracy. It combines the merits of high precision, high accuracy, and wide range. Its potentially superior traceability to a rubidium clock can be utilized in velocity metrology.
研究不足
The minimum speed of the electric rail being 100 mm/s limits the ability to measure at lower speeds. The sampling time was too short at higher speeds to collect enough data due to the limit of the length of the electric rail.
1：Experimental Design and Method Selection:
The experiment involves generating two optical combs by electro-optic phase modulators and tracing their repetition frequencies to a rubidium atomic clock. One comb functions as the measurement laser and the other as the reference.
2：Sample Selection and Data Sources:
The velocity of a moving target is measured by illuminating it with the laser and measuring the scattering caused by movement.
3：List of Experimental Equipment and Materials:
Includes a seed laser, electro-optic phase modulators, an Er-doped fiber amplifier, a large collimator, an electrical rail, an acousto-optic modulator, RF drivers, a rubidium atomic clock, a fast photodetector, and an oscilloscope.
4：Experimental Procedures and Operational Workflow:
The output of the seed laser is split into two parts, modulated, amplified, and then combined to detect the Doppler shift.
5：Data Analysis Methods:
The stored waveforms by the oscilloscope are processed to obtain the Doppler shift information, and the velocity is calculated using the Doppler effect formula.
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Fast photodetector
FD310
Menlosystems
Detecting the combined laser beams
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Oscilloscope
Waverunner 610Zi
LeCroy
Storing waveforms for data processing
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Spectrum analyzer
FSH8, 3 kHz RBW
ROHDE&SCHWARZ
Measuring beat notes between the signal source and the local oscillator
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Electrical rail
LMA-TR-200, travel 200 mm, resolution 1 μm/s
Zolix
Mounting a moving corner prism for velocity measurement
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Acousto-optic modulator
MT110, 110 MHz frequency shift
AA opto-electronic
Avoiding the frequency ambiguity
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RF driver
N5173B
Agilent
Driving the electro-optic phase modulator
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RF driver
E8267D
Agilent
Driving the electro-optic phase modulator
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Rubidium atomic clock
8040
Microsemi
Locking the repetition frequencies of the optical combs
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RIO ORION Laser Module
1543.5 nm, 5.1 kHz line width, 18 mW
RIO
Seed laser for generating optical combs
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Electro-optic phase modulator
<5 V half-wave voltage Vπ, 2 W RF power
EOSpace
Modulating the seed laser to produce different frequency sidebands
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Er-doped fiber amplifier
Amplifying the output of the EOM
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Large collimator
FC40
micro laser system
Expanding the beam size of the signal source
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