Visual inspection in the pharmaceutical sector / in medicine

The visual inspection describes the optical inspection of a product or produced part for defects or production errors. As a non-destructive method of quality assurance, visual inspection is particularly suitable for the detection of scratches or defects, but also for the inspection of foreign particles or other external defects.

In addition to the "industrial image processing" test tool, which is increasingly finding its way into medical technology, optical quality assurance is still used.

Although the artificial intelligences are getting better and better, they still do not come close to the sensitivity of humans. The eye and the hand are still the number one measurement tools. For this reason, some tests cannot yet be completely replaced by the AI.

In medical technology, optical quality assurance is often only supplemented with the use of industrial image processing and runs simultaneously.

Depending on the test task, these can be tested using the transmitted light method or incident light. We will help you to find suitable lighting from our range. Particularly with a combination of an optical test with an industrial inspection, it must be ensured that the lighting meets both requirements:

  • high quality light spectrum for optical testing
  • pleasant diffuse light for the examiner
  • high-frequency light for industrial image processing
  • Shadow-free light as a good basis for the evaluation software
  • smooth housing structures for easy cleaning
  • low heat development of the light fields

With our high-quality lights for visual control, users in the pharmaceutical industry can check containers for foreign particles, incorrectly fitted, incorrectly fitted or cosmetic defects.

These are mainly used for testing:

  • Plasma bags
  • Insulin reservoir
  • Vaccination ampoules
  • Blister for tablets


Example 1: Testing of insulin bottles in medical technology

Example 1: Testing of insulin bottles in medical technology

Insulin bottles are tested alternately in front of a light and dark back wall in an LED cabin. In this way, both light and dark particles can be recognized in the solution. The shape of the cabin isolates extraneous light, so testing is always carried out under constant conditions.

Example 2: Testing of plasma bags in pharmaceutical technology

Example 2: Testing of plasma bags in pharmaceutical technology

The test time and the break time are given to the employee by signals. The basic light stays on all the time so that the eye can always see in a uniform brightness (less fatigue). The signals are implemented through targeted LED spots directly at the visual inspection. In this way, controlled and uniform test processes are specified. The individual results of the visual inspection are easier to compare.

Sample video: An employee visually inspects parts for complete and correct assembly. A light barrier or motion detector recognizes the start of a visual inspection. After the adjustable test time, the inspector is informed that his test time has ended. The reason for this is that the test item is not “tested too dead”. After a further adjustable pause, a signal is given that a new test process can begin.

Example 3: Testing of blisters for medicine

Example 3: Testing of blisters for medicine

Tablet blisters are checked for errors on an LED transparency plate. With the transmitted light, holes or damage can be recognized very well. The controller can optimally adapt the brightness to the test. This must not be too dark, but also not too light.

Depending on the test task in the medical technology or pharmaceutical industry, several test methods are combined in one. This means that they can be flexibly adapted to changes in the test item. Since the lights are developed and manufactured in-house, our customers have many options.

When choosing the right test lights, the working environment must also be taken into account. We would be happy to advise you here too:

  • Tidy workplace (distraction from the inspection work)
  • Well-lit workplace in the right brightness (avoidance of premature fatigue)
  • No annoying bright colors (negative influence on the test)
  • Avoidance of daylight-dependent extraneous light (achieving a uniform test environment)

Do you have any questions?

More information and points of contact:

+49 (0) 9364

We develop tailor-made solutions for you. Fast, inexpensive and individual.

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