Multiplexer - 30 Pages

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Multiplexer

Catalog excerpts

Przedsiębiorstwo Badawczo-Produkcyjne OPTEL Sp. z o.o. ul. Morelowskiego 30 PL-52-429 Wrocław tel.: +48 (071) 329 68 54 fax.: +48 (071) 329 68 52 e-mail: optel@optel.pl www.optel.eu Ultrasonic Multiplexer OPMUX v12.0 Manual For OPMUX with firmware version 1.01 OPMUX v12.0 – Manual – Optel 11.06.2013

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OPMUX v12.0 – Manual – Optel 11.06.2013

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OPMUX is particularly well suited for ultrasonic measurements as well as other kinds of measurements that need many channels. Together with the measurement card OPCARD (link) and ultrasonic probes it could be used as complete ultrasonic testing device. Each channel has separate pulser & receiver. Trigger input Control logi< Amplifier Multipl Analog input Analog output Digital inputs Relays outputs MUX can operate with transducers of the resonant frequency of 0.5MHz - 25MHz and any impedance. Depending on the version MUX has from 4 to 35 channels. Each channel can operate as a transmitter...

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MUX can be equipped with additional input and output peripherals: Analog Input 0V-10V Analog Output 0V-10V Four relays to control an external load Two digital inputs for buttons connecting. 1.1 Technical data Device parameters Power supply: Channels (available types of MUX): PRF (pulse repetition frequency): Max cable length between computer and the box: Box size (height / length / width) MUX4 Communication interface Interface type: Baud rate: Transmitters Output impedance: Ultrasonic transducer frequency: Pulse amplitude range: Amplitude control: serial interface or analog input 0-10V...

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Maximum output signal amplitude: ±2V Input impedance: 50Q @iOMHz ^parameter can be changed on request Analog input: Analog output: Digital input: Inputs Accept Voltages to 5.5 V; Input includes pull-up resistor to 5V; OPMUX vl2.0 - Manual - Optel 11.06.2013

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MUX allows to work using two measurement methods: Work by reflection (Pulse Echo) Work by transition (Through Transmission) Pulse Echo Rising edge Signal output Receiveq echo Travel time This method uses the same ultrasonic transducer to transmit and receive. To work in this mode, is necessary to select the same channel of the Mux to transmit and receive (Ch.l on figure above). At the time of the coming of trigger signal, the transmitter will produce a pulse that actuates ultrasonic transducer. Transmitter generates ultrasonic waves that are reflected from the test object and received by...

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attenuation of the ultrasound wave in the environment and of partially absorbing by the object. Therefore, you should set the appropriate gain at measurement card. On the output signal will also appear crosstalk from the transmitter - this is universal effect. Through Transmission Rising edge Signal output 'Travel time This method uses two or more transducers. In this way, you can examine the attenuation of ultrasonic waves at the transition (as shown on the figure above) or register a wave reflected from the object (when transmitters are placed at different angles relative to the object)....

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MUX is equipped with a memory, which contains preset sequence of active channels. An example of a sequence consisting of eight elements: In this example, addresses of the transmitter and the receiver are identical. It means that according the first trigger sensor connected to the first channel (CHI) transmits and receives the signal at the same time (Pulse Echo). According the second trigger, transducer connected to the second channel (CH2) transmits. Ninth trigger will reset the index and starts playback of the sequence from the beginning This example sequence in the timing diagram: OPMUX...

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Voltage Sn the transmitters output Transmitter generates a high voltage pulse of a precise time when trigger signal comes. Falling edge of the pulse causes the excitation of the transducer and generation of the ultrasonic wave. This control causes that the transmitter is excited to its resonance frequency (for example, 5 MHz). f The higher the voltage at the output of the transmitter, the higher the power of the generated OPMUX vl2.0 - Manual - Optel 11.06.2013

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Pulse at the output of the transmitter can be controlled by two parameters: - Charging time (SL command); - Charging voltage (SI command). The figures show the dependence of the pulse shape at the output of the transmitter according to the set parameters of the transmitting (SI and SL commands): j The maximum pulse voltage depends on the type of sensor, and can be, for example 200V (unloaded transmitter has on output pins about 400V). Optimal charging time depends on the type of used transmitter . Transmitters with a larger capacity, may require longer charging time. f Extending charge time...

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2.3 Trigger delay MUX reacts to the rising edge of trigger signal. But charging Pulse does not start at exactly the same time - the transmitter starts with some delay. This time marked as tdelay is about 200ns and is constant. This delay represents the time propagation of logic circuits. OPMUX v12.0 – Manual – Optel 11.06.2013

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3.1 Description of signal circuit Signal circuit consists of three main parts: Band Pass Maximum input signal amplitude Maximum output signal amplitude 1. Multiplexer allows selecting the channel from which the signal is measured. 2. Bandpass filter cuts off noise apart from set measurement bandwidth. 3. Amplifier initially amplifies a weak signal received from the transducer, so that it can be sent to the measuring card even through the long cable. The signal at the multiplexer input can have a maximum value of 400mVpp. With the amplifying xlO it makes the output signal amplitude 4Vpp. MUX...

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3.2 Channel switching time Multiplexer channels are toggled when the trigger pulse appears. The signal from the selected channel is not immediately visible in the output. There is needed some time to stabilize the signal circuit. This time period marked as t it h is about 3us. 3.3 Crosstalk between channels Crosstalk between channels is inevitable. However, it has very little value - unselected channel signal achieves the output but is attenuated about 550 times. OPMUX vl2.0 - Manual - Optel 11.06.2013

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