Sound Intensity carpe sonum

Dipl.-Ing. Udo Wagner Director Sales & Marketing Director Calibration Services [email protected] Dr.-Ing. Matthias Domke CEO Dr.-Ing. Matthias Domke [email protected]

DIVISIONS Test & Measurement Testbench Project Team Broadcast & Recording Repair & Service Livesound & Installation DAkkS-/Factory Calibration

HISTORY Founded in 1928 by Georg Neumann in Berlin Moved to Gefell during the World War II Georg Neumann & Co GDR Period VEB Mikrofontechnik Gefell After German Reunion Microtech Gefell GmbH Georg Neumann KG (Owner)

PRODUCT RANGE Test & Measurement Microphones

PRODUCT RANGE Broadcast & Recording Microphones Large Diaphragm Transistor Amplifier Large Diaphragm Tube Amplifier Small Diaphragm Transistor GENERATION 4

PRODUCT RANGE Livesound & Installation Microphones Line Array Microphone KEM 975 with Delta Capsule

Calibration Laboratory ISO 17025 DAKKS and Factory Calibration

Testbench Project Team Consulting, Engineering and Project Planning of Acoustic Test Bench Technology

Repair & Service Capsule, Preamplifier, Powersupply, etc.

Measurement Microphones Capsules – New Stainless Steel - 200V and Electret

Measurement Microphones Capsules - Traditional Nickel - 200V and Electret

Measurement Microphones Preamplifiers and Complete Microphones IEPE – BNC-Connector

Measurement Microphones Digital Microphone Systems USB-Interface Transducer Absolute Calibration

Measurement Microphones Outdoor- and Weatherproof Microphones

Measurement Microphones Hemisphere for Sound-Power-Measurement Radius 1m Radius 2m Nondirectional, Wideband Sources DIN EN ISO 3745 Nondirectional, Wideband Sources and universal Case Bars 6 or 12 Microphones 10 or 20 Special Design on Demand

Measurement Microphones Sound-Calibrators

Sound - Intensity Probes SIS 190.1 1/2“,1/4“ SIS Double, SIS 193 1/2“,1/4“, SIS 194 1/2“, ¼“ - Only IEP

Sound - Intensity Probes Accessories Remote Control Handle Cable Splitter Spacer

Sound-Intensity New Capsule Pair MK 281 E Sensitivity 12,5mV/Pa Polarization 0V Electret Max. SPL Freq. Range Int. Meas. 35Hz…8kHz Headgrill Spiral Slot

Sound-Intensity Theory - Basics pu-Probe (pv-Probe) Pressure-Microphone, Velocity-Probe Microtech Gefell

Theory - Basics of pp-Probe MB Intensity Vector I, Acoustic Power Flow Density dP, Surface Area dS Sound Pressure p, Sound-Velocity v Average Sound-Pressure betw. 2 Microphones Basic Equation, Sound Velocity, Difference Quotient Sound Velocity Sound Intensity x-Component ex^x+ ey~^y+ ez^-z

Theory - Frequency Range - Upper Frequency Limit Systematic Deviation Pressure Approximation, Difference Quotient Sinc Function Spacer Length, Upper Frequency Limits

Sound-Intensity Theory – Range of a 50mm Spacer Blue: Soundwave 35Hz, Red: Soundwave 1500Hz, Detail: Length of 50mm Spacer

Sound-Intensity Theory – Frequency Range – Lower Frequency Limit Phase Divergence bewteen Measurement Channels Phase Difference between two Microphones in one Sound Wave Sound Intensity  Deviation of Intensity Measurement  Maximum acceptable Phase

Sound-Intensity Theory – Frequency Range – Lower Frequency Limit MAXIMUM ACCEPTABLE PHASE ERRO

Sound-Intensity Frequency Ranges

Sound-Intensity Frequency Ranges THEREFORE YOU NEED DIFFERENT SPACERS AND CAPSULES FOR THE COMPLETE FREQUENCY RANGE !

Beuth-Verlag: VDE-Verlag:

Sound-Intensity-Probes SIS 190.1 – The Basic Model SIS 190.1 ½" 1/2" Intensity Probe Class 1 acc. IEC 61043 35Hz to 8kHz

Sound-Intensity-Probes SIS 193 – Localization of Sound Sources

Sound-Intensity-Probes SIS 193 – Localization of Sound Sources

Sound-Intensity-Probes SIS 194 3D – 3-Dimensional Sound-Intensity Measurement

Sound-Intensity-Probes SIS 190 Double – Wideband Sound-Intensity Measurement SIS 190 double 1/2" and 1/4" Intensity Probe 35Hz to 12 KHz

Sound-Intensity-Probes Calibration of Sound-Intensity-Probes ISO 17025 DAKKS-Calibration of seperate Channels: Sensitivity in one or more Points Factory-Calibration of complete Probe-Unit PI-Index IEC 61043 User: Calibrators 1 or more Points and PI-Index Double Coupler

Sound-Intensity-Probes Calibration PI-Index (Pressure-Intensity-Index)

Microtech Gefell GmbH Christian Czolbe, Hansrudolf Graf: Messung von Schienenschallintensität. Prose AG, DAGA 2018 München Stefan Kaiser, Mathias Wutti: Kalibrierung von pv-Sonden. Graz im Juni 2013 Dipl.-Ing. D. Richter: Schallintensitätssonde SIS 90 Theoretische Grundlagen. Microtech Gefell GmbH / Technische Universität Dresden DIN EN 61053 DIN ISO 1702

Thank you for your attention ! www.microtechgefell.de [email protected] [email protected]