Highlights cavispector

cavispector has been developed to meet the requirements of the measuring procedure according to the specification IEC TS 63001. Beyond this, it offers additional benefits to its users.

Hardware components cavispector

In principle, the device consists of three components. The hydrophone, a preamplifier with an analog to digital converter and a convertible PC. If desired, temperature measurement can be added. The system can be operated by keyboard or touchscreen.


The underwater microphone, the hydrophone, which measures the broadband acoustic noise in the cleaning bath. The sensor is encapsulated in a casing made of nitrile rubber, with an acoustic impedance similar to water. The tip of the hydrophone has a circumference of 11 mm. The hydrophone has a connecting cable with a BNC-plug.


The convertible-PC which contains the application for the measurement. The convertible has the advantage that inputs containing a lot of text, which are performed mostly before the real measurement, can be typed comfortably on the keyboard. During the measuring the GUI is operated by touch screen, which allows the hardware to be more compact and protected better against splash water.


A preamplifier with an analog to digital converter. It has two inputs, where the hydrophone can be connected as well as an output of a signal generator. The input signals are processed like in an oscilloscope. All functions, such as amplification or time resolution, for example, are controlled by a convertible-PC which is connected by a USB-cable.

Set Up

To perform the measurement, hydrophone, preamplifier and PC are connected. Because the preamplifier receives its power supply from the PC, sole battery operation is possible. After the measuring parameters have been set, the hydrophone is inserted in the cleaning tank und the measurement is started. One single measurement only lasts about 500ms, therefore many measurements are normally performed subsequently, so that a statistical computation is possible.

After starting the software application, the test person can input his or her personal password. The successful identification will later be documented in the test record cover.

 The measurement is performed in the classic IPO model:

  • input
  • processing
  • output

 When typing input data, it must be considered, that various parameters have to be processed and documented for the measurement of the cavitation noise level Lcn and for the generation of the test record. These parameters are:

  • data of the client
  • name of the test person
  • manufacturer of the ultrasound cleaning device or line
  • selection of single device or line
  • serial number of the device or line
  • name of the device or line
  • number of US cleaning tanks in the line
  • type of the device or tank and its data


  • operating frequency
  • mode of ultrasound
  • setting of power (bottom and side)
  • setting of temperature
  • kind of liquid
  • kind and concentration of detergent
  • load of the tank
  • information, whether the bath has been degassed
  • kind of movement of the hydrophone in the bath
  • the filename is created automatically

All these data are typed in and can be selected systematically in a ribbon at the top of the display. Master data of the customer, the test person, the cleaning line and the devices can be entered and recorded separately in advance.

In the subsequent measurement a number of single measurements can be performed and analyzed statistically. The measured values in the time domain, the frequency spectrum and various other data are shown on the display (figure 1). These presented data help to ensure that the measurement was performed correctly.

Figure 1 Screenshot of measured values and data after one measurement

Finally, a test record, which contains the input data and the test results, is created automatically. Besides the cavitation noise level Lcn, there are also data for the operating frequency and statistical values. If desired, the values of the temperature measurement can be recorded also. The complete test record consists of a cover sheet containing general data (figure 2) und test records which contain the data of the specific measurements (figure 3).

Figure 2 Test record cover

Figure 3 Test record

After the measurement the test record is saved automatically, where the file name is composed of the serial number of the device, the date and time stamp of the test. The complete user interface is designed in a way which rules out mistakes at typing the input data and at operating nearly completely.

Quality Monitoring

Why cavispector ?

cavispector has been developed to meet the requirements of the measuring procedure according to the specification IEC TS 63001. Beyond this, it offers additional benefits to its users.

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