[IM/FM phase delay time measurement method of laser for TDLAS]

Area of Science:

• Optics and Photonics
• Interferometry
• Laser Physics

Context:

• Accurate gas concentration measurements are crucial in environmental monitoring and industrial process control.
• Intensity-Modulation/Frequency-Modulation (IM/FM) phase delay in lasers can introduce significant errors in sensitive measurements.
• Existing methods may lack the precision or real-time capability to address these phase delay effects.

Purpose:

• To present a novel method utilizing a fiber Michelson interferometer for measuring laser IM/FM phase delay.
• To quantify the phase delay time of a modulated laser signal.
• To demonstrate the method's utility in compensating for phase delay errors in gas concentration measurements.

Summary:

• A fiber Michelson interferometer was employed to measure the intensity-frequency (IM/FM) phase delay of a modulated laser.
• Experimental results indicated a discrepancy between the measured and theoretical IM/FM phase delay values.
• The developed method effectively compensates for the signal strength-frequency phase delay effect impacting gas concentration measurements.

Impact:

• Provides a practical approach to enhance the accuracy of gas concentration measurements.
• Offers a tool for real-time correction of laser-induced phase delay errors.
• Contributes to advancements in optical sensing and metrology for environmental and industrial applications.