Ultrasonic Sensor for the transmission of signals for process control for high pressure processing
- How does it work?
- What can it be used for?
- What can it not be used for?
- Related Facilities
- Further Information
|Key words||high pressure, packaging, treatment, automated processing, process control, food development|
How does it work?
|Primary objective||Online temperature measurement under high pressure conditions.|
|Working principle|| To determine the temperature, a resistance based sensor is utilized during high pressure treatment to change the frequency of an ultrasonic emitter. Battery and electronics to operate the ultra-sonic device are encapsulated and are located (submarine-like) within the treatment chamber of the high pressure vessel. A microphone on the outside of the vessel records the frequencies transmitted by the device in the vessel. A computer program does the translation into a temperature signal. The sensor has an accuracy of ± 0.1°C in a range of 0 to 80°C and can be used in a pressure range between 0.1 to 600 MPa.
In addition p-T-pH diagrams and kinetic models of desired and undesired reactions are available. In addition to microbial inactivation the reaction rate of undesired reactions (changes in colour and texture, fat oxidation) were developed.
Further on characterisations of pH – values under high pressure now can make use of optical in-situ techniques. For the detection of pH in different, homogenous components of meat products immobilised indicators on optical fibres were developed.
Thus, modelling and numerical simulation are possible; time- and position-dependent temperature distribution and flow pattern as well as reaction kinetics of desired and undesired reactions now can be calculated.
The purpose of the device is to transmit temperature changes during pressure generation. The sensor can be placed manually in, on, at different substance brought into the high-pressure vessel.
|Important process parameters||-|
|Important product parameters||-|
What can it be used for?
|Products||high pressure vessels|
|Operations||Measuring temperature and pressure.|
|Solutions for short comings||
What can it NOT be used for?
|Risks or hazards||Possibility of wrong measurement due to incorrect calibration and / or insufficient power supply.|
|Maturity||Industrially available for high pressure vessels (industry machines).|
|Modularity /Implementation||Expandable for additional sensors for example pressure, pH-sensors, color, etc.|
|Consumer aspects||Easy to use.|
|Environmental aspects||Optimizing production processes; energy saving.|
Facilities that might be interesting for you
|Institutes||DIL, University of Erlangen-Nürnberg|
- - Sensors and Indicators 2.1.1 physical other ICT Sciencedirect, Web of science Search terms: high pressure treatment, pH-value high pressure treatment WikiSysop :Template:Review document :Template:Review status