Ensures excellent imaging for research, development, quality assurance and medical engineering – with no magnetic interference
MACOM II ® Active Magnetic Field Compensation System
www.MuellerBBM.com
Creating optimum conditions for your work By compensating magnetic interference, MACOM II ® enables precise imaging for research, development, quality control and medical diagnostics.
Electron microscopes, high-resolution medical diagnostic equipment and elec tron beam lithography systems for scan ning the smallest of structures (such as in semiconductor manufacturing for example) require optimum environ mental conditions to achieve the best possible results. Research, development, quality control and diagnostics are the main applications for highly-sensitive technologies. In addition to a constant temperature, minimum vibration and quiet acoustic conditions, a magneti cally quiet environment is also crucial for achieving optimum performance. Magnetic interference fields of just a few 10 nT already affect the resolu tion of sensitive systems, while typical
sources of interference such as trams and trains, power cables and electrical installations in buildings often create magnetic interference fields of several 100 nT. Passive screening of these fields is usually very expensive. MACOM II ®, the active magnetic field compensation system from Müller-BBM, creates the optimum magnetically quiet environ mental conditions for your systems with the minimum of effort. Optimise your imaging output and ex ploit the performance of your systems to the full. By enabling more reliable and meaningful imaging – without in terfering magnetic fields – MACOM II ® ensures that your investment in the latest analytical and diagnostics techno logy will pay dividends more quickly.
Our experience – your success
Patented technology
For more than 40 years Müller-BBM has been a leading engineering company in the field of technical acoustics and vibration control, and for the past ten years we have also been acting as consulting engineers for electromagnetic compatibility. All three fields are accredited according to DIN EN ISO/IEC 17025, and the quality management system of Müller-BBM is also certified according to ISO 9001. As a result of our wide-ranging experience, we are able to provide our customers with a comprehensive service by performing a site analysis and/or identifying sources of interference prior to the installa tion of a sensitive system. Our goal is to cre ate complete, fully functioning solutions that deliver perfect results for your work.
All the know-how we have gathered over decades of experience from our develop ment and consultancy work in the area of magnetic fields has gone into MACOM II ®. The result is a patented system successfully used worldwide which helps scientists, re searchers and physicians analyze and docu ment their work better. MACOM II ® actively helps you obtain better results.
The product we offer for magnetic field re duction is the state of the art MACOM II ® magnetic field compensation system. Easy to operate and maintenance-free, this system automatically creates the optimum working conditions for you.
The applications of MACOM technology are as exciting as they are wide-ranging:
Material analyses / metallurgical structural investigations Nanoparticle research All scanning electron microscope applications Semiconductor technology / chip manufacture Medical diagnostics (especially magnetic resonance tomography)
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Convincing results User-friendly, maintenance-free operation, perfect results – MACOM II ® is bound to convince you of its benefits.
Image from a scanning electron microscope before and after installing MACOM II ®. Influence of a 50 Hz interference source on imaging. Image section 20 nm.
Maintenance-free operation MACOM II ® automatically neutralizes interfering magnetic fields. Once it has been set up correctly during com missioning, the system requires no fur ther maintenance. For operating the system and monitoring its functions MACOM II ® has a display on which all parameters can be viewed and adjusted if necessary. During operation the dis play shows either the remaining magne tic field in all three coordinate directions or the coil current required to create the opposing field. For optimum support MACOM II ® is equipped with one serial and one Ethernet port, allowing it to be controlled from an external computer over an intranet or the internet.
The system also supports optional remote control or monitoring by Müller-BBM. The advantage is obvious: perfect service anywhere in the world – without incurring unnecessary travel expenses.
MACOM II ® and MACOM II ® MR – The advantages at a glance
Automatic compensation of magnetic interference fields Optimised imaging Enhances the performance of your systems Patented technology Easy to operate Remote control No maintenance
MACOM II ® – Principle MACOM II ® represents the distillation of our many years of experience in consulting and magnetic field compensation into a cleverly designed and successful patented system.
RS 232 | LAN
Signal Processor
D
DC-Offset
Probe
As vector fields, magnetic fields can be cancelled out by another field of the same magnitude in the other direction. MACOM II ® automates this process. In practice the superpositioning does not provide full cancellation, but it does considerably reduce magnetic inter ference fields. The prevailing magnetic field is measured and a corresponding opposing field is created by means of an arrangement of current-carrying coils. Since magnetic fields change quickly or slowly depending on the particu lar source of the interference (e.g. DC electric trains, electrical switches or mo ving metallic objects such as lifts, steel doors or motor vehicles in the vicinity), MACOM II ® operates across a wide fre quency range.
A
Multiplexer
Filter
Pre-amplifier
The heart of the system is the patented sensor which measures interference fields from 0 Hz (constant field) to over 100 kHz. The sensor signal is processed in an analogue automatic control unit with a stable control range between 0 Hz and 50 kHz. A broadband power amplifier generates the current for the opposing field. The system works as a closed control loop, with the oppo sing field instantaneously following the changes in the interference field.
Final amplifier
Room coil
The coils for the opposing field are placed at the edges of the space to be compensated; depending on the size of this space, a self-supporting aluminium construction may also be used. The sen sor is mounted at the point where the maximum field reduction is to be at tained. If this is not feasible it can also be placed outside this area, so to some extent it is possible to utilize the symme trical properties of the coil arrangement to freely select the point of maximum field reduction.
Buildings Room Acoustics Electroacoustics and Audio/Visual Systems Building Acoustics Thermal and Hygric Building Physics Building Climatology Facade Technology Fire Protection Building Dynamics Environment Air Quality Control Traffic Noise Control Industrial Noise Control Vibration Control EMEC Lighting Engineering Harmful Substances in Buildings Safety Technology
Müller-BBM – comprehensive solutions from a single source Our strengths: consulting, inspecting, measuring, planning An international engineering consultancy with more than 250 em ployees, Müller-BBM is represented at nine locations in Germany and has numerous project offices all over the world. As leaders in the building, environment and technology fields, our independent experts, planners and technical specialists have been advising custo mers since 1962. As a consulting and development office, Müller-BBM has the know ledge and experience to create client-focused solutions, and custo mer satisfaction is of paramount importance to us. The success of MACOM II ® worldwide in research, development and medical tech nology is one of the many fruits of our endeavours.
Technology Vehicle Acoustics Ship Acoustics Railway Technology Industrial Plant Acoustics Machinery Acoustics Psychoacoustics Mobile Communication Product Tests
MACOM II ® and MACOM II ® MR – Technical data Field reduction *) . ........................... 0 – 1 kHz: > 60 dB
1 – 5 kHz: 20 – 60 dB
10 – 50 kHz: 0 – 20 dB
Noise (0 – 50 kHz) ............................ < 1 nT Long-time stability ......................... < 1 nT Maximum interference field **) ...... approx. 10 μT
Office Locations
Output current ................................ 3 x 3A
Planegg / Munich Main office Berlin Dresden Frankfurt Gelsenkirchen Hamburg Cologne Nuremberg Stuttgart
Display . ........................................... Flux density or output current,
Müller-BBM GmbH Robert-Koch-Straße 11 D-82152 Planegg / Munich Germany Phone + 49 (89) 85602-0 Fax + 49 (89) 85602-111
www.MuellerBBM.com
system parameters
Interfaces ........................................ RS 232, Ethernet Power input .................................... max. 270 W Form factor...................................... 19" 4U rackmount case or desktop *) The specifications relate to the location of the probe. **) The strength of the opposing field, and consequently the maximum interference field, depends on the size of the area to be compensated. A room volume of approximately 4m x 4m x 3m is assumed here.