Part-in-part detection

More transparency with solutions from ipf


High-performance light barriers from ipf electronic have a number of special properties and therefore offer interesting potential for a wide range of applications. The systems enable, for example, the inspection of products in hybrid design and thus part-in-part detection even with absolutely opaque housings.


High performance light barriers consist of a selection of transmitters, receivers as well as amplifiers with various basic functions, including a measuring mode of operation, a manual power setting and automatic power control. The light barriers operate with non-visible, extremely short-wave infrared light, which has excellent penetration properties. Due to the high transmission power, the systems can achieve ranges of up to 70 meters. The power reserves available as a result are generally used for contamination compensation, but are also suitable for part-in-part detection in non-metallic housings.


For this purpose, ipf electronic recommends, for example, systems with a single-channel amplifier such as the OV620800 with switching output. The amplifier can be set via a DIP switch so that basically two options are available for the query: A switching output is set in case of additional attenuation of the light barrier (component to be tested is located in the housing) or in case of decrease of attenuation (component is missing). The sensitivity required for the application is set via a potentiometer on the amplifier.


With such a system in manual operating mode, very diverse solutions for quite different tasks can be realized, such as the presence monitoring of a printed circuit board installed in a closed plastic housing, to name just one example.

However, the amplifier with switching output cannot only monitor a single, previously fixed limit value, but also several different limit values via the teach function. This means that several different products can be monitored with one system, e.g. if the size or material thickness of the test specimens change or if the housing materials change.


Single-channel amplifiers such as the OV62C903 with an additional analog output enable the measuring mode and thus even more precise queries, since they map the received signal of the high-performance light barrier proportionally. Such solutions can, for example, check an opaque housing for the presence of several component inserts arranged one above the other inside, whereby the 0-10V signal can also be used to determine the exact number of inserts. An example of this would be the inspection of individual dividers that are located as baffles in a container. The only restriction here is also: Neither the housings nor the inserts to be tested may be made of metal or have a complete metallic coating. Exceptions are self-contained housings made of a metal mesh.