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Applications - High Frequency Spark Vacuum Tester
The amount of pressure, the filling degree and possibly the kind of gas are determined based on the luminous phenomena created. This is done without damaging the content or the glass, as only the gas inside is brought to luminescence.
Often there is a problem to test finished parts from a series production line in a non-destructive and reliable way. The High Frequency Tester provides a productive solution to this.
Testing of illuminants (lamps, bulbs)
Applications in the pharmaceutical industry
Checking of insulation glass
Checking of solar panels
|Base units & plasma evaluation systems|
HFT–00 (base unit)
Base unit for the excitation of a plasma with the aid of fixed parameters.
The power output is infinitely variable.
HFT-01 (base unit with change-over switch)
HFT-06 (control unit, remote control and display)
HFT-10 (plasma evaluation)
HFT-20 (plasma evaluation in the lab model)
HFT-22 (plasma eval and detection in the lab model)
Click on the images of the units to download the technical specifications or contact us for more details, images and manuals.
|Description of testing procedure|
The procedure is described using the high frequency test as an example. The measurement process is structured in accordance with the reference principle. A reference piece of the same type with the required properties and the test criteria is used for the reference measurement. For a vacuum this would be an evacuated test piece with negative pressure of 250 mbar for example. The ground of the test device is on the test-piece or is attached via fixing aid e.g. with a metallic counterpart that is opposite to the test probe. The power supply is switched to the lowest potentiometer setting and the test probe is placed on the non-conductive test sample surface. A discharge passing through the test sample can be detected. If at first there is no visible discharge the potentiometer must be set higher until a stabile spark gap is produced.
Please Note: due to the vacuum that will be tested, there should naturally be as little visible discharge as possible because an absolute vacuum that does not contain gases cannot be ionized, i.e. no currents can flow.
The induced discharge is based on a high-pass high voltage that is generated through a Tesla transformer. Since electromagnetic waves are only influenced and diverted by metallic objects, or by conductive objects in general, in this case the waves penetrate the non-conductive surface and the vacuum, until they are attracted by a good ground. En route through the vacuum the foreign particles contained are excited due to impact ionization and thus they create a conductive atmosphere. The emissions caused by the excited electrons falling back into the normal state of the particles are visible as light in their specific colors. The purer the vacuum the fewer emissions that can be seen. When testing gas-filled spaces with thin glass walls, select the lowest setting on the device and the high frequency voltage should be increased slowly until there is a visible discharge, otherwise the danger of breakdown exists due to the glass wall. An error would occur that did not exist prior to the test, and thus render the measurement as well as the test sample unusable.
|Unique Characteristics of the High Frequency Vacuum Spark Tester Systems|
The system consists of an electronical control unit, which produces a high frequent modulated high voltage.This is applied to the test product / piece by a special converter (check pistol or probe).
By the up-modulation of gas-depending, low to high frequent impulses on to the carrier frequency, even ignition reluctant gases can be put into the fourth status of aggregation. Thus, a plasma is also created from ionisation reluctant gases.
The particular advantage of this system is the avoidance of radiation, which allows a direct operation with the automatic system (recognition of plasma, computer etc.) Plasma, which the human eye does not recognize, is now recognized and evaluated.
With the aid of the automatic recognition it only needs a low energy supply into the test piece. A faint and gentle excitation is sufficient for the contents (i.e. vaccination sera) and for the glass.
Furthermore, other electronic devices or radio communication are not interfered. A healthy person can come into contact with high frequency un-intentionally and will not suffer from any health defect.The hand tools in the shape of a pistol can be used without any hesitation.
The detection of invisible plasma, which is able to detect and to evaluate it in second sequence.
The system has obtained certifications for TÜV (technical survey), CE and radio harmlessness and compliance with EU regulations and in the scope of science there is no comparative and competitive product in the market sceme.
Theses systems has been in use for several years and has proven its skills and reliability. Well known enterprises, universities, laboratories, health authorities are to use this system exclusively for the above mentioned reasons.