DISPOSITIVO DE DETECCION DE LA PRESENCIA DE ESCARCHA Y/O DE LA MEDIDA DEL ESPESOR DE LA MISMA POR ULTRASONIDO, Y SONDA PARA ESCARCHA A UTILIZAR CON ESTE TIPO DE DISPOSITIVO

In a detection device of the presence of frost and/or measuring the thickness of the frost by ultrasound, a probe with a piezoelectric ultrasonic transducer generates an ultra-sonic acoustic emission wave and detects ultrasonic acoustic echo waves reflected by the frost. An actuating device for the probe is arranged to provide to the transducer electrical energizing signals. The probe comprises: a frost detector placed in front of the transducer and constituted of a material having an acoustic impedance between 30x105 and 44x105 kg m-2s-1. This detector has a surface designed to be exposed to the surrounding atmosphere to be covered with frost. An acoustic delay device is adapted to ensure acoustic coupling and adaptation between the transducer and the detector and to separate in time the ultrasonic emission add reflected waves. A body of heat insulating material covers the assembly of the detector, the transducer and the acoustic delay device.