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 taken into account when installing and assembling 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 result, 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 serious.
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 precise 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 is very important to the echo of the sensor. With the correct viewpoint of the ultrasonic sound cone, the smooth and lubricated surface can form the ideal reflection effect. It is necessary that the angular deviation 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. Conversely, due to the predominance of diffuse reflection of ultrasonic signals, the rough appearance allows for greater viewpoint deviations.
This feature is used to detect fill levels or pile heights of coarse-grained materials with viewpoint deviations of up to 45°. (at the scale of attenuation)
The following guidelines can be well detected:
All lubricated and solid targets are aligned perpendicularly to the viewpoint 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 relies on the reflective properties of the guideline. Therefore, there are various standard guidelines for the acoustic cone curve in the technical parameters. The sound beam does not have precisely defined boundaries and can be changed due to environmental influences such as temperature or humidity.
In operation, if an undesirable reflector appears, 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 it is necessary to provide a large target with reflective characteristics (edge disturbance).
If there are no gaps, many of our ultrasonic sensors offer the option of modifying the sound beam. This procedure can be performed using a teach-in button or a programming interface and software. This software can be used as a selective push for a large number of test scales within the disturbance policy (fixed rule of thumb).
The minimum interval between the ultrasonic sensors of the parallel device
In order to prevent ultrasonic sensors of the same detection scale from disturbing each other when parallel installations, it is necessary to consider the minimum distance between the sensors, which is illustrated in the following illustration. Displays specific values in the table that 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 viewpoint. The actual distance (x) required depends on the alignment, type, and appearance of the guide located within the sound cone.
Minimal spacing of ultrasonic sensors for the façade device
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