[Retracted] Application of Internet of Things Technology in the Construction of Bored Pile Foundation in a High Altitude Environment

Table 2

Parameters of a sonar transmitting transducer.

Model	Transmit frequency	Maximum instantaneous power/kW	Signal consistency	Sonar spread angle/(°)
–5–1	200 Hz～8 kHz	10	Good	More than the 120
Features	Operating temperature/°C	Way of working	Pressure/MPa	Operating voltage/V
High energy, broadband, short aftershocks	−40～+80	Single, continuous	1.0	12