Ultrasonic sensors are used for the inspection of printed circuit boards (PCBs), where ultrasonic sensors are used to inspect printed circuit boards. So what factors need to be considered when installing and installing ultrasonic sensors?
Ultrasonic sensors are capable of being installed and operated in any orientation, 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 may degrade the crust of the layer or affect the function of the ultrasonic sensor. Note: A handful of dust is not grim.
The direction of the drive
The target object to be tested can enter the sound beam from either side. The distance and echo curves in the technical parameters of the ultrasonic sensor enable accurate proximity to the pre-set detection point.
The appearance characteristics of the guideline
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. Positioned in the right point of view with the ultrasonic sound cone, the flat and lubricated exterior creates the most ambitious reflections. 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)
The following guidelines can be well detected:
All lubricated 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 placed randomly
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.
In these cases, thru-beam sensors may be required by these raw materials.
Sound beams and voids
The echo curve of ultrasound refers to the sound cone. If they reflect the satisfied echoes to the ultrasonic sensor, the target is detected within the sound beam. This echo curve depends on the reflective properties of the guideline. As a result, the acoustic cone curve in the technical parameters has a variety of normative guidelines. The sonic cone does not precisely define the gap, as environmental influences, such as temperature or humidity, can be modified.
In use, if the reflector is not presented, there must be a gap around the sound cone. This is the only way to avoid incorrect switching signals.
Echo Curve 2 (25 mm round bar) is used to locate small, round, or reflective objects. It is likewise used for lubricating the exterior, parallel device 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 characteristics (marginal disturbance).
If there are no gaps, many of our ultrasonic sensors offer the option of modifying 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 selective target for disturbance within a large number of detection scales (fixed policy push).
The minimum interval between the ultrasonic sensors of the parallel device
In order to prevent interference between ultrasonic sensors of the same detection scale when parallel to each other, it is necessary to consider the minimum distance between the sensors. When the sound cone viewpoints are parallel to each other and the object is on the correct viewpoint axis of the acoustic cone viewpoint. The actual spacing (x) required depends on the alignment, type, and appearance of the guideline within the sound cone.
Minimal spacing of ultrasonic sensors for the façade device
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