Today, Chemisky works at Siemens Industry Automation in Karlsruhe as a project manager on the optimization of the pressure transducers that are found in many measuring points in the chemicals industry. Since safety is paramount when handling hazardous substances such as gasoline or acids, the developers worked for a long time to design a sensor that works on the piezo principle. The sensor reports a change in the value to be measured if its resistive elements are stretched through pressure. As well as pressure, however, the sensor’s temperature also plays an important role. For safety reasons, attempts are being made to make the temperature measurement redundant. By sheer coincidence, Chemisky hit on the idea of using the semiconducting transition, which links the resistances with the substrate in the sensor, for temperature diagnosis. "Colleagues came to me with a non-functioning sensor," recalls Chemisky. He discovered that the connection of the substrate was inadvertently at the wrong electrical potential. This error, which was quickly corrected, gave Chemisky the idea of using this electrical transition to measure temperature. The electronic system regularly issues the instruction to measure the forward voltage of the transition. If this value changes, it is an indication that the temperature has also changed.

In the years prior to his discovery, Chemisky had worked primarily on the development of gas sensors and injection valves. With gas sensors, there is always the problem that the sensor will not react only to the gas it is supposed to detect, but will also demonstrate a broad range of cross-sensitivities. The Siemens researchers have overcome this problem through a sophisticated combination of sensors and adaptive systems, whose basic principles Chemisky helped to develop.

Chemisky also played a large part in the development of the broadband oxygen sensor that measures the oxygen content of the exhaust gas from a car engine.

"Designing the electronic control system was very complex, because many different variables had to be coordinated with one another," recalls Chemisky. The sensor had to operate at a temperature of 850 degrees Celsius, for example. The heating for this had to be controlled electronically so that the sensor’s temperature would remain largely constant, regardless of the engine’s operating status. Chemisky therefore always had to be one step ahead of his colleagues’ work. "It was only with a functioning electronics system that we were able to get the best out of the sensor during development so that we could show that it would actually work," he says.

The same was true of the further development of the piezo injection technology for gasoline engines, which Chemisky worked on during his time at the Siemens automotive technology plant in Regensburg, Germany, developing control electronics and building pre-production samples. After working at Siemens, the Lorraine-born graduate of the French elite university of technology ENSEA (Ecole Nationale Supérieure de l’Electronique et de ses Applications) began to yearn for home. However, since he had been associated with the company since his student days as a member of the Siemens international student group, Chemisky found a way to return to France without leaving Siemens. He found his solution in the Siemens plant for Industry Automation in Karlsruhe, which was within reach of the Chemisky family’s new home near Strasbourg. And so he remains the "man for new solutions" in his area of expertise.