The "pairing" of ultrasonic transducers involves multiple steps such as physical connection, electrical matching, parameter calibration, and system configuration, which need to be operated according to the probe type (such as industrial flaw detection, flow meter, medical diagnosis) and specific application scenarios. The following are the key steps and technical points:

I. Physical connection and wiring

Identification of wiring terminals

The transducer usually has three core connections: signal positive, signal negative, and ground isolation wire. Double core shielded cables (outer diameter ≤ 7mm, conductor cross-sectional area 0.5~0.75mm ²) should be used, with a length as consistent as possible and ≤ 10 meters to avoid signal attenuation.

Waterproof treatment: After the cable passes through the waterproof tightening head, lock the terminal and apply sealant (such as screw glue, silicone) on the edge of the cover plate.、

II. Electrical impedance matching

Impedance mismatch can cause signal distortion or energy loss, and requires targeted treatment:

Direct matching: If the output impedance of the instrument and the input impedance of the transducer are both low impedance (such as piezoelectric ceramic transducers), they can be directly connected.

Transformer matching: When driving low resistance transducers with high resistance instruments, a step-up autotransformer needs to be installed.

Insufficient driving capability: If the waveform is distorted (such as the collapse of the sine wave after connecting the probe), it is necessary to increase the power amplification circuit and ensure that the operating frequency response covers the working frequency band of the probe (such as 2.2MHz).

III. Parameter calibration and system configuration

Calibration is the core of ensuring measurement accuracy and requires the use of standard test blocks (such as CSK-IA, CSK-IIIA):

1. Frontier and zero calibration

Align the probe with the circular arc surface of the test block (such as R100), find the highest echo, measure the distance from the front end of the probe to the top of the arc, and calculate the leading edge value (such as 100mm - measured 87mm=13mm).

Translate the transducer to another reflector (such as R50 arc), adjust the sound velocity and zero offset through the gate to make the echo depth consistent with the actual value.

2. K-value/angle calibration

Align the transverse hole of the test block (such as a 40mm deep Φ 1mm hole), move the transducer to find the highest echo, input the theoretical depth value, and the instrument automatically calculates the K value (the measured value is qualified if the error between the measured value and the nominal value is ≤ 0.1).

3. DAC curve production

Collect the highest echo point by point for multi depth reflectors (such as 10mm, 30mm, 50mm horizontal holes), and the instrument automatically generates a distance amplitude curve for quantitative defect evaluation.

IV. Differences in application scenarios

1. Industrial flowmeter transducers

Installation methods are divided into V-type (pipe diameter 25-400mm) and Z-type (pipe diameter 100-600mm, suitable for turbid media).

Fault handling: When the signal is weak, it is necessary to clean the scale on the pipe wall or use an inserted probe instead; When there is a large fluctuation in traffic, adjust the probe position to ensure that the signal strength is greater than 3%.

2. Weld seam inspection transducer

It is necessary to match the standard (such as GB/T 4730), and record the depth, amplitude, and position coordinates when detecting defects after calibration.

3. Medical diagnostic transducers

The adaptive system automatically obtains transducer parameters (frequency, impedance), generates driving signals, and achieves "plug and play" functionality.

The core of pairing ultrasound transducers is "physically reliable connection → electrical impedance matching → precise parameter calibration → scene adaptation and debugging". Industrial scenarios require strict adherence to the calibration process of test blocks, while in the medical field, adaptive technology can be used to simplify the steps. If the signal is abnormal, priority should be given to checking the waterproof connection, impedance matching, and driving capability, and then investigating the parameter settings.