Измерение плотности потока лазерного луча и глубирны отверстия от одиночного импульса позволяет прогнозировать качество работыИсточник изображения: Sakurai

Japanese scientists come up with an easy way to dramatically improve laser cutting quality with a Raspberry Pi camera


Laser cutters and engravers are now widely used both in industry and for home use. The laser beam cuts more precisely and accurately than traditional tools. But even this cut quality or resolution can be increased several times, Japanese scientists said. Interestingly, a simple Raspberry Pi Camera Module v2.

Measurement of laser beam flux density and single-pulse hole depth predicts performance Image source: Sakurai

Measurement of the laser beam flux density and single pulse hole depth predicts the quality of the entire job. Image source: Sakurai

It is no secret that in order to improve the accuracy of laser cutting, it is necessary to organize feedback to obtain data on the interaction of the laser beam with the material. This will remove a number of uncertainties in the production process, but in practice it is not so simple. Today this happens with the help of regular measurements and takes a lot of time for abstract work. For example, it is necessary to constantly monitor the depth of the holes depending on the power of the laser pulse.

“It often takes tens or hundreds of depth measurements to measure the depth of a laser cut. This is a major obstacle to fast, automated laser-based manufacturing systems. “Said Professor Junji Yumoto from the Physics Department of the University of Tokyo. Instead of hundreds of measurements, Japanese scientists propose to do just one, which promises to improve the control of laser processing.

Another prerequisite for improving laser cutting machines was the use of inexpensive measurement solutions. Fortunately, this is facilitated by the rapid development in recent years of the industry of producing optical sensors for smartphone cameras and not only. It turned out that the Raspberry Pi Camera Module v2 is quite enough for solving the task.

During the test, the scientists recorded the laser pulse flux with a Raspberry Pi Camera Module v2 and immediately measured the hole in the sapphire. Then one data was superimposed on others and the relationship between the laser beam flux density and the depth of the hole made was determined. It turned out that the density of the laser beam perfectly correlates with the depth of the holes and a simple algorithm can calculate up to 250 thousand pulsed actions of the laser beam on the material from just one observation.

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