Analog signals from the receivers are conditioned by a low-noise DOT1L 1 MHz bandwidth voltage preamplifier (RESON EC6081/VP2000). The low-pass and high-pass filters (?6 dB/octave roll-off) are set typically at 1 MHz and 50 kHz, respectively. The amplifier gain ranges from 0 to 60 dB to optimize the input range of the DAQ board, depending on the amplitude of the incoming signal.The interface was developed in MATLAB computing language (MathWorks, Inc., Natick, Massachusetts, USA) for a Dell Dimension 340 desktop computer (Dell Inc., Round Rock, Texas, USA) to communicate with all components, including the motion control unit, waveform Inhibitors,Modulators,Libraries simulation/generation, data acquisition, and data analysis. The MATLAB control and analysis interface could also be compiled into libraries and executable files for use in the field or by any users without access to MATLAB.
A NI PCI-6111 board (National Instruments Corporation, Austin, Texas, USA) was used for both outputting the encoded signals and acquiring Inhibitors,Modulators,Libraries the received signals. It is a 12-bit analog-to-digital, simultaneous-sampling multifunction data acquisition board. It has two simultaneously sampled analog inputs at 5 million samples per second (MS/s) per channel and two 16-bit analog output channels at up to 4 MS/s for one channel or 2.5 MS/s for dual channels. It was chosen for its high Inhibitors,Modulators,Libraries output and sampling rate capabilities and Inhibitors,Modulators,Libraries compatibility with MATLAB. The high sampling rates allow accurate representation of JSATS 416.7 kHz signals with at least ten samples per signal cycle.
The compatibility with MATLAB allows easy incorporation of data analysis packages already developed in MATLAB, leading to real-time measurement and data analysis.The motion control unit consists of various automation components Carfilzomib (Parker Hannifin Corp., Cleveland, Ohio, USA): a 20802 rotary table geared with an HV231 stepper motor, as well as an E-AC motor drive and a 6K8 controller. The receiver is held in the tank by a cylindrical fixture extending to the motorized rotary positioning table above, which is attached to the top of the tank (Figure 1). The controller communicates with the computer via a serial cable and MATLAB commands.3.?System Calibration and Data AcquisitionDuring the design process, a general formulation was derived for system calibration and performance measurements. Suppose:Vrms is the root-mean-square (RMS) value of the transmitted waveform in volts.
Wrms is the RMS value of the acquired waveform in volts.G is the corresponding gain of the signal amplifier in decibels (dB), defined as 20 times the logarithm of the RMS ratio.D is the distance from the transducer to the receiver in meters; D is 1 m read this in Figure 1.Ps is the transmitting sensitivity of the transducer in dB re 1 ��Pa /V @ 1 m.Hs is the hydrophone sensitivity in dB re 1 V /��Pa.TL is the transmitting loss in dB.
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