盧福明2006-07-252018-07-102006-07-252018-07-101999-07-31http://ntur.lib.ntu.edu.tw//handle/246246/10415本研究以馬鈴薯為樣本，以水面高 度、探頭距離及輸送帶前進速度三種變因 進行超音波水中測試，以找出最佳的水中 量測方式。接著以此方式量測馬鈴薯的水 中超音波穿透波與擷取波形時機之間的關 係。結果指出超音波波形與擷取不同部位 馬鈴薯通過受測區域的波形時機有關。 利用細鐵棒沿馬鈴薯的長軸穿入，製 造不同的空心程度，再分析其超音波穿透 波的衰減係數和能量頻譜矩。結果發現有 穿孔的馬鈴薯其能量頻譜矩比無空心的馬 鈴薯要小，所以水中超音波檢測馬鈴薯機 械具有開發的可行性。Potato samples were selected in this study. The treatments for studying influencing factors on ultrasonic measuring accuracy were water level, distance between transducers and speed of the conveyor belt. Relationships between the characters of underwater transmitting ultrasonic waves (attenuation and spectral moment) and the timing of measurement were also investigated. The results showed that the underwater ultrasonic transmitting waves were affected by timing of measurement. Potatoes were penetrated by a steel bar along the major axis to create different degrees of hollowness. The spectral moment of transmitting ultrasonic wave was found smaller in hollow potato than in normal potato. It is feasible to develop an underwater ultrasonic detection machine for potato.application/pdf59786 bytesapplication/pdfzh-TW國立臺灣大學生物產業機電工程學系暨研究所馬鈴薯超音波水下衰減係 數能量頻譜矩PotatoUnderwaterUltrasonicCoefficient of attenuationSpectral momentreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/10415/1/882313B002093.pdf