LIQUID LEVEL DETERMINATION DEVICE

PROBLEM TO BE SOLVED: To easily and quickly determine a liquid level of a liquid container body on the basis of reflection waveform information of an ultrasonic wave.SOLUTION: A liquid level determination device includes: ultrasonic wave transmission and reception means 2 which is attached to a bottom outer surface of a liquid container body 1; waveform information acquisition means 3 which acquires waveform information of a reflection wave received by the ultrasonic wave transmission and reception means 2; liquid level determination means 4 which determines "a non liquid-filled state" when the phase of a peak waveform of a first reflection wave is the same as the phase of an outgoing wave, and "a liquid-filled state" when the phase of the peak waveform of the first reflection wave is opposite to the phase of the outgoing wave on the basis of the waveform information acquired by the waveform information acquisition means 3. With this configuration, the liquid level state of the liquid container body 1 can be easily and quickly determined on the basis of only the waveform information of the reflection wave, facilitation, speed-up and cost reduction in liquid level determination can be achieved, and improvement in accuracy of liquid level determination can be expected. 【課題】液体容器体の液位を、超音波の反射波形情報に基づいて簡易迅速に判定する。【解決手段】液体容器体１の底部外面に取付けられた超音波送受信手段２と、超音波送受信手段２において受信される反射波の波形情報を取得する波形情報取得手段３と、波形情報取得手段３により取得された波形情報に基づいて、第１反射波のピーク波形の位相が発信波の位相と同相であるときには「非満液状態」と判定し、第１反射波のピーク波形の位相が発信波の位相と逆相であるときには「満液状態」と判定する液位判定手段４を備える。係る構成によれば、液体容器体１の液位状態を反射波の波形情報のみに基づいて簡易且つ迅速に判定することができ、液位判定の簡易迅速化及び低コスト化が図れるとともに、液位の判定精度向上が期待できる。【選択図】図１