摘要
一種光聲探頭，包括一光纖以及一法布立-培若干涉結構。光纖包括一中央核心、同心核心及披覆層。光纖具有一端面。中央核心的折射率大於同心核心的折射率，同心核心的折射率大於披覆層的折射率。法布立-培若干涉結構配置於端面而覆蓋中央核心暴露於端面的部分。一種光聲探測方法，包括下列步驟。經由同心核心傳遞一脈衝雷射至一待測物。法布立-培若干涉結構接收待測物受脈衝雷射激發而產生的一超音波，並藉由超音波將中央核心傳遞的一回傳光線調變為一回傳調變光。接收並分析回傳調變光，以獲取待測物的資訊。另外還有一種光聲探測系統。
An optoacoustic probe including an optical fiber and a Fabry-Perot interfering structure is provided. The optical fiber includes a center core, a concentric core and a cladding layer. The optical fiber has an end surface. A refractive index of the center core is larger than a refractive index of the concentric core, and a refractive index of the concentric core is larger than a refractive index of the cladding layer. The Fabry-Perot interfering structure is disposed on the end surface and covers a portion of the center core exposed at the end surface. An optoacoustic sensing method including following steps is provided. A pulse laser is transmitted via the concentric core to an object to be sensed. The Fabry-Perot interfering structure receives an ultrasound generated from the object excited by the pulse laser and modulates a return light transmitted via the center core with using the ultrasound into a return modulated light. Information of the object can be obtained by receiving and analyzing the return modulated light transmitted via the center core. An optoacoustic sensing system is also provided.