Ultrasonic sensors are used for the inspection of printed circuit boards (PCBs):
In this application, ultrasonic sensors are used to inspect printed circuit boards. So what factors need to be considered when installing and installing ultrasonic sensors?
Ultrasonic sensors can be installed and operated in any position, and they are highly resistant to the effects of the external environment. However, in order to achieve the desired measurement results, these points need to be kept in mind when installing ultrasonic sensors. For example, when cleaning an ultrasonic sensor, make sure that the outer surface of the sensor (the decoupling layer) and the overall foam around the transducer are not damaged. Water droplets or crusts in the deletion layer may affect the function of the ultrasonic sensor. Note: A small amount of dust is not severe.
Appearance characteristics of guides:
Ultrasonic sensors are capable of detecting solids, liquids and powders. The appearance of the target object is very important for the echo of the sensor. With the ultrasonic sound cone in the right point of view, the flat and smooth appearance can constitute the reflection of the most ambitious ambition. It is necessary that the angular error of the reflector should not exceed 3° to ensure reliable detection.
The characteristics of the raw material such as transparency, color, or finish (polished or matte) have no effect on the reliability of the inspection. The rough exterior is capable of reflecting the energy of sound waves in multiple directions. This reduces the overall size of the test. On the contrary, because the diffuse reflection of the ultrasonic signal is dominant, the rough appearance allows for greater viewpoint errors.
This feature is used to detect fill levels or stack heights of coarse-grained material with viewpoint errors of up to 45°. (at the scale of attenuation)
*** small interval of ultrasonic sensors of parallel devices:
In order to prevent ultrasonic sensors of the same detection scale from disturbing each other in parallel installations, it is necessary to consider the small spacing between the sensors, which is illustrated in the following illustration. Specific values in the display table can be used as a reference. When the sound cone viewpoints are parallel to each other and the object is on the correct viewpoint axis of the acoustic cone. The required practice spacing (x) depends on the alignment, type, and appearance of the guideline located within the sound cone.
The following guidelines can be well detected:
All smooth and solid objects are aligned straight with the point of view of the sound cone
All solid objects with a rough appearance can cause diffuse reflection, which is randomly arranged
The point of view between the sound cone and the liquid level is less than 3°
The following information cannot be well detected:
Absorb ultrasonic signals such as felt, cotton, coarse textiles, or foam at temperatures above 100°C.
In these cases, thru-beam sensors may be required by these raw materials.
Sound Beam and Voids:
The echo curve of ultrasound refers to the sound cone. If they reflect the satisfied echoes to the ultrasonic sensor, the guideline is detected within the sound beam. This echo curve depends on the reflective properties of the guideline. Therefore, the acoustic cone curve in the technical parameters has various normative guidelines. The sound cone has no boundaries because environmental influences such as temperature or humidity can be changed.
In an application, if the reflector is not required, there must be a gap around the sound beam. This is the best way to avoid incorrect switching signals.
Echo Curve 2 (25 mm round bar) is used to locate small, round, or reflective objects. It is the same for smooth exterior, parallel devices in the direction of the sound beam of the ultrasonic sensor (vessel inner wall, pipes). The void corresponds to at least curve 1 (flat panel 100 mm x 100 mm) and is necessary to supply large targets with reflective features (edge disturbance).
If there are no gaps, many of our ultrasonic sensors offer the option of correcting the sound beam. This program can be performed by using a teach-in button or a programming interface and software. This software can be used as a scrambling policy (fixed policy push-in) with selective push-to-click within many inspection scales.
Direction of drive:
The target object to be tested can enter the sound beam from either side. The interval and echo curves in the technical parameters of the ultrasonic sensor enable accurate proximity to the pre-set detection point.
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