Air-Based Isolation for Precision Scientific Instruments

Air-based isolation systems have been commercially available for the past four decades, and have become the standard isolation mechanism in precision instrumentation, providing a high level of noise reduction at an unprecedented value.

Many different air-based systems are available with different sizes, load capacities and form factors.

Herzan Air-Based Isolation

Herzan is a specialist in desktop air isolation systems, offering low-profile, high performance systems that are user friendly and easy to install. The Onyx and DT Series are the two lines of desktop isolation systems offered by Herzan.

The Onyx Series

Herzan designs and produces the Onyx Series at its headquarters in Southern California. The company offers the Onyx tables in three standard sizes and load capacities.

In addition, it offers bespoke Onyx tables based on the specific requirements of a research application. The Onyx series has been successfully complementing interferometers, optical microscopes, stylus profilometers, and much more.

The DT Series

Herz Company Ltd. designs and manufactures the DT Series in Japan. It launched the DT Series as a low-profile, desktop air system in 1994. Herzan exclusively distributes Herz systems in the Americas.

Principles of Operation

The operating principles are basically the same for both the Onyx and DT series. In each system, the base of the instrument is supported by a steel powder coated top plate.

The mounting plate is placed over the pneumatic isolators to deliver a neutral top plate environment. It is supported by three to five isolation mechanism assemblies depending on the system size.

The basic isolation mechanism components include a piston, surge tank, damping orifice air chamber, and diaphragm.

The mounting plate is supported by the piston resting on the diaphragm. The flexible bladder diaphragm provides vertical movement, thereby imparting horizontal vibration isolation. The diaphragm forms the sides and top of the air chamber, which behaves like an air spring to provide vertical isolation.

The piston moves up and down on the diaphragm when vibrations reach the system, thereby pushing the air through a damping orifice at the bottom of the air chamber. The kinetic energy is converted to heat by the air traversing the orifice.

This heat attenuates the resonances of the system. The surge tank imparts stability to the system by acting as ballast. Diagram of the Onyx Series isolation mechanism is depicted in Figure 1.

Diagram of Onyx Series isolation mechanism

Figure 1. Diagram of Onyx Series isolation mechanism

Both the Onyx and DT series are available in manual or automatic load adjustment. In the manual load adjustment system, the air chambers are inflated using a hand pump. Regular check is necessary to ensure that the air chambers are inflated properly.

Height sensors and an air regulator are used in the automatic load adjustment version. The height sensors measure the compression level on each side and discharge air accordingly.

The air regulator is linked to an external air supply to draw air in for re-inflating the air chambers when the pressure level is low in the system. This mechanism compensates for load changes on top of the system automatically.

Advantages of Herzan Air-based Isolation

The following are the key advantages of Herzan air-based isolation:

  • Overall high level of performance
  • Low profile
  • Offered in a range of sizes
  • Available with manual and automatic load adjustment
  • Begins isolating in low frequencies (DT Series: 4Hz, Onyx Series: 4Hz)
  • Unmatched cost-to-performance ratio
  • Customizable to meet specific research requirements
  • Exceptional value
  • Large ballast tanks impart superior stability to the system

About Herzan

Herzan provides high performance environmental solutions for precision research instruments. They include acoustic enclosures, vibration isolation systems, Faraday cages, and site survey tools. Herzan specializes in supporting nanotechnology research, but also offers solutions for product testing, in-vitro fertilization, and many other applications.

Herzan understands that every application and environment is different, so it collaborates with customers to create comprehensive integrated solutions that satisfy their unique demands.

Herzan was founded in 1992 by Ann Scanlan in Orange County, California. Originally, Herzan was established as an American subsidiary of Herz Company Ltd., a Japanese company specializing in vibration control. The name Herzan comes from the amalgamation of 'Herz' and 'Ann'.

This information has been sourced, reviewed and adapted from materials provided by Herzan LLC.

For more information on this source, please visit Herzan LLC.

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