The utilization of Ramsey interferometry via coherent population trapping (CPT), which enables the optical interrogation of microwave transitions without the reliance on microwave cavities, plays a crucial role in the advancement of compact and low-power quantum sensors.Particularly, high-resolution hellcat spark plugs CPT-Ramsey spectroscopy of alkali-metal atoms has found extensive application in constructing miniaturized quantum sensors like atomic magnetometers and atomic clocks.Due to their well-defined environment and extended coherence time, cold atoms offer enhanced sensitivity and precision in CPT-Ramsey interferometry.This review comprehensively examines CPT-Ramsey interferometry with karate goju ryu book cold atoms, encompassing both conventional and multi-pulse techniques, and explores their potential applications in practical quantum sensors.