This　study　proposes　a　novel　chirped　fiber　grating　loop　ring-down　strain　sensor　based　on　overlap　spectrum　demodulation　technology.　Using　a　ring-down　structure　and　overlapping　spectrum　demodulation　technology,　the　structure　can　relate　the　inverse　of　the　cavity　ring-down　time　(1/τ)　to　the　strain.　This　design　has　many　advantages,　including　good　linearity,　a　wide　measuring　range,　and　excellent　flexibility.　Furthermore,　the　feasibility　of　the　sensor　design　is　demonstrated　by　both　theoretical　analysis　and　experiment　results.　©　2022　Elsevier　Inc.