An insertion detector for monitoring a position of a medical probe relative to a body cavity of a patient, the probe incorporates a proximity sensor that is responsive to a predetermined property of the patient’s body. The proximity sensor may include a light emitter and a light detector. When the medical probe is inserted into the body cavity, a light flux between the light emitter and light detector is changed due to either obstruction by the cavity walls or reflection by the patient’s skin. A response from the proximity sensor may be used to adjust a temperature measured from the body cavity to correct for errors due to non-insertion or partial insertion of the probe into the body cavity.一種用以監測一醫療探針相對於一病人之一體穴的位置之插入檢測器，該探針併設一接近感測器其可反應該病人身體之一預定性質。該接近感測器可包含一光發射器和一光檢測器。當該醫療探針插入該體穴中時，該光發射器與光檢測器之間的光通量會由於被該體穴壁阻擋或被該病人的皮膚反射而改變。一由該接近感測器的回應可被用來調整一由該體穴測得的溫度，以校正因該探針未插入或部份插入該體穴中所生的誤差。
