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    1.
    发明专利
    未知

    公开(公告)号：DE10200349A1

    公开(公告)日：2003-07-17

    申请号：DE10200349

    申请日：2002-01-08

    Applicant: SCHROFF GERHART ,  STETTER MICHAEL

    Inventor： SCHROFF GERHART ,  STETTER MICHAEL

    IPC: B23K26/12 ,  B23K26/70 ,  G01N21/17 ,  G01N21/25

    Abstract: The invention relates to a method and an array for detecting foreign substances in the beam path of optical imaging or beam control systems (10), in which the housing enclosing the beam path and the optical components (10') is filled or flushed with a protective gas. Said protective gas is exposed to an intensity-modulated electromagnetic analytical wavefield (4') in a test volume (3). A photoacoustic signal (5) is generated for detecting impurities or foreign gases by means of the photoacoustic effect created when frequency components of the analytical wavefield (4') are absorbed by said foreign gases and/or impurities.

    Leak locating method for containers e.g. water and oil coolers in vehicles
    4.
    发明专利
    Leak locating method for containers e.g. water and oil coolers in vehicles 未知

    公开(公告)号：DE19600472A1

    公开(公告)日：1997-07-10

    申请号：DE19600472

    申请日：1996-01-09

    Applicant: SCHROFF GERHART ,  STETTER MICHAEL

    Inventor： SCHROFF GERHART ,  STETTER MICHAEL

    IPC: G01M3/10 ,  G01M3/06

    Abstract: The method involves immersing the test item (3) filled with a pressurised search fluid, preferably a gas, in a test tank (1) filled with test fluid (2). If any search fluid emerges at a leakage point from the test object, if the search fluid is suitably chosen, it can rise up through the test fluid. The search fluid can then show up on the surface of the test fluid indicating the presence of a leak (5). From the position of the search fluid on the surface of the test fluid the location of the leak can be determined.

    Determining beat frequency of modulated pulsed signals - esp. from laser doppler anemometer used for fluid velocity measurement
    5.
    发明专利
    Determining beat frequency of modulated pulsed signals - esp. from laser doppler anemometer used for fluid velocity measurement 未知

    公开(公告)号：DE4118700A1

    公开(公告)日：1992-01-02

    申请号：DE4118700

    申请日：1991-06-07

    Applicant: SCHROFF GERHART ,  STETTER MICHAEL

    Inventor： SCHROFF GERHART ,  STETTER MICHAEL

    IPC: G01R23/14

    Abstract: Determination of the beat frequency of amplitude- or intensity-modulated pulsed signals, esp. scattered light signals emitted by moving particles and modulated by spatially alternating light/dark effects, is carried out by (a) initiating at the beginning of the signal, a scanning operation which is interrupted at the signal end; (b) measuring, during the scanning operation, the time-dependent signal intensity in a time sweep adapted to the beat frequency and (c) evaluating the resulting measurement sequence to determine the beat frequency. A system for carrying out the determination is also obtained. USE/ADVANTAGE - The process is esp. useful for signal processing in optical velocimeters and esp. laser Doppler anemometers for non-contact local measurement of fluid velocites. It allows determination of the beat frequency of modulated pulsed signals in a wide frequency range and with high measurement rates.

    Testing for leaks in pressure vessels
    6.
    发明专利
    Testing for leaks in pressure vessels 未知

    公开(公告)号：DE19812284A1

    公开(公告)日：1999-09-23

    申请号：DE19812284

    申请日：1998-03-20

    Applicant: STETTER MICHAEL ,  SCHROFF GERHART

    Inventor： STETTER MICHAEL ,  SCHROFF GERHART

    IPC: G01M3/22 ,  G01M3/38 ,  G01M3/32 ,  G01N21/71 ,  G01N21/90 ,  G01N25/20 ,  G01N27/18 ,  G01N27/62 ,  G01N29/22

    Abstract: Testing for leaks in pressure vessels uses a test fluid containing dissolved gases that are the first to escape through a leakage point and can then be detected and measured. The test fluid, water, oil or the like, will contain dissolved gases, ranging from hydrogen, organic or inorganic gases to more exotic compounds such as sulfur hexafluoride. The vessel is filled by evacuating it, feeding in gas to a predetermined pressure and then adding the test fluid. The gas will be the first to escape at a leakage point so that it can be detected and analyzed there with equipment covered by other patents of the present inventor. It is necessary not only to detect the place of leakage but also the amount. This is determined by the concentration of the test gas, as measured by optical means using a mass spectrometer, semiconductors or probes to measure thermal conductivity, electron affinity or resonance characteristics. The initial detection is carried out by manually, or mechanically, operated sniffer probes. The test fluid is recovered and stored after completion of a test.

    Localised leak detection for containers or housings
    8.
    发明专利
    Localised leak detection for containers or housings 未知

    公开(公告)号：DE19535720A1

    公开(公告)日：1997-03-27

    申请号：DE19535720

    申请日：1995-09-26

    Applicant: SCHROFF GERHART ,  STETTER MICHAEL

    Inventor： SCHROFF GERHART ,  STETTER MICHAEL

    IPC: G01M3/24 ,  G01M3/38 ,  G01M3/32

    Abstract: The method provides localised testing for leaks in containers and/or housings. A test fluid acts on test object. The fluid is pressurised relative to surroundings such that when there is a leak, fluid leaks out from the test object. The point of the leak may be illuminated by light. The test fluid and the light are matched to each other such that the photoacoustic effect can appear. The resulting sound signal can then be detected by sound detector. The test object is only partly illuminated by a spatially limited light bundle. The incident area of light bundle on test object is moved over all points to be examined. When there is a leak, photoacoustically generated sound is detected from the sound detector and characterising parameters are analysed. In dependence on the derived information signal level the characteristic properties of the light bundle are varied such that a closed feedback loop results. The existence of a leak is recognised from the closing of the loop. The location of leak is determined from position of light bundle.

    Analyzing a gas mixture by generating a photoacoustic signal comprises adding a gas that suppresses kinetic cooling
    10.
    发明专利
    Analyzing a gas mixture by generating a photoacoustic signal comprises adding a gas that suppresses kinetic cooling 未知

    公开(公告)号：DE102004034832A1

    公开(公告)日：2006-03-16

    申请号：DE102004034832

    申请日：2004-07-19

    Applicant: SCHROFF GERHART ,  STETTER MICHAEL

    Inventor： SCHROFF GERHART ,  STETTER MICHAEL

    IPC: G01N21/25 ,  G01N21/37 ,  G01N21/61 ,  G01N29/04

    Abstract: Analyzing a gas mixture by exposing it to intensity-modulated electromagnetic radiation in a test zone and detecting radiation-absorbing gases and/or impurities by means of a photoacoustic signal comprises adding to the mixture a gas (G2) that suppresses kinetic cooling so that the photoacoustic signal is an unambiguous measure of the energy absorbed by the radiation-absorbing gases and/or impurities. Independent claims are also included for: (1) suppressing and/or analyzing kinetic cooling in an optical imaging or irradiating system comprising a zone through which electromagnetic radiation is passed and and which is filled or flushed with a radiation-nonabsorbing protective gas (G1), by enriching G1 with a gas (G2) in an amount such that kinetic cooling is suppressed and/or the partial pressure of G2 is 2-300 mbar and/or the energy absorbed by radiation-absorbing gases and/or impurities in G1 is an unambiguous means of assessing the radiation quality of the system and/or the G1+G2 mixture can be analyzed for radiation-absorbing gases and/or impurities; (2) gas analysis system comprising a detection chamber (3) that can be filled with a gas mixture to be analyzed, a radiation source (11) for irradiating the detection chamber with intensity-modulated electromagnetic radiation, and an acoustic sensor (7) for detecting pressure fluctuations produced by the photoacoustic effect, and a device for adding to the mixture a gas (G2) that suppresses kinetic cooling.

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