Overview
A reference measurement microphone is a specialized transducer designed for high-accuracy sound measurement applications. Unlike consumer-grade microphones, it adheres to stringent international standards (e.g., IEC 61672 Class 1) to ensure traceable calibration. These devices are essential in acoustic research, automotive NVH testing, and building acoustics, where even minor measurement errors can significantly impact results. Manufacturers like Brüel & Kjær, GRAS, and PCB Piezotronics dominate this niche market. The microphone's design prioritizes linearity and stability, often incorporating electrostatic actuator technology for in-situ calibration checks. Its B2B demand stems from industries requiring ISO 17025-compliant measurements, including aerospace, audio engineering, and environmental health monitoring.
Structure and Working Principle
The core component is a pressure-sensitive diaphragm, typically 1/2" or 1/4" in diameter, mounted in a hermetically sealed cartridge. When sound waves strike the diaphragm, it vibrates, creating a capacitance change against a fixed backplate. This change is converted to a voltage signal by a built-in preamplifier with ultra-low noise circuitry (e.g., FET-based). Advanced models feature TEDS (Transducer Electronic Data Sheet) chips storing calibration data for plug-and-play use with analyzers. The housing is engineered to minimize diffraction effects, often using free-field or random-incidence correction grids. Some industrial variants include anti-electromagnetic interference shielding for use near high-voltage equipment.
Key Features
Frequency response stability (±0.2 dB in premium models) distinguishes reference microphones from general-purpose variants. They maintain this precision across temperature fluctuations (e.g., -10°C to +50°C operational range) thanks to temperature-compensated designs. Other critical features include a dynamic range exceeding 140 dB (from threshold of hearing to near-damage levels) and phase coherence for multi-channel systems. High-end models offer removable preamps for field servicing and IP54-rated enclosures for outdoor use. Notably, their sensitivity drift is typically <0.02 dB/year when properly maintained.
Application Areas
Primary applications include anechoic chamber testing (e.g., for speaker manufacturers), wind tunnel acoustics in automotive R&D, and occupational noise monitoring per OSHA/NIOSH standards. In audio production, they calibrate studio monitors to EBU Tech 3276 specifications. Emerging uses encompass smart city noise mapping and electric vehicle sound signature analysis. Medical applications include hearing aid testing and diagnostic audiometry. Industrial plants deploy them for predictive maintenance via acoustic emission monitoring of machinery bearings and valves.
Maintenance and Precautions
Regular maintenance involves cleaning the protective grid with isopropyl alcohol and checking for diaphragm condensation in humid environments. Always use manufacturer-supplied calibrators (e.g., pistonphones at 250 Hz/124 dB) rather than generic sound sources. Transportation requires dedicated shock-proof cases to prevent diaphragm deformation. Avoid exposing the unit to oil mist or conductive dust, which can bridge electrode gaps. For long-term storage, maintain 30–60% relative humidity with desiccant packs. Note that frequent high-SPL (>160 dB) exposure may accelerate aging of the diaphragm assembly.
B2B Procurement Guide
When sourcing reference microphones, verify the supplier's accreditation (e.g., ISO 17025 for calibration certificates). Request documented proof of NIST-traceable calibration—not just factory testing. Consider bundled solutions with compatible power supplies and field calibrators to ensure measurement chain integrity. Lead times for high-precision models can exceed 8 weeks; plan procurement accordingly. For OEM buyers, discuss customization options like special connector types (e.g., LEMO vs. BNC) or extended warranty terms. Bulk purchases (10+ units) often qualify for 15–20% discounts from authorized distributors.
Related Manufacturers
- 主营：麦克风、雅马哈、视频会议
- 主营：无纸化会议系统、会议室整体解决方案、多媒体会议系统、无线麦克风、无纸化会议、液晶屏升降器、液晶屏翻转器、无纸化系统、无纸化会议系统软件、无纸化升降系统、无纸化升降终端、会议话筒、数字会议系统、电子桌牌系统、墨水屏电子桌牌、墨水屏桌牌、电子桌牌、话筒、无纸化系统软件、无纸化会议终端客户端软件、话筒升降器
- 主营：浓度监、分析仪、监测仪、测量仪、剂量计、报警仪、天然气、能谱仪、水质分、水分仪、半电池、黑度仪、测汞仪、测定仪、农残仪、接虫袋、流量计、浊度计、采样器、传声器、消解器、噪声计、氮吹仪、酒石酸、硬度计
- 主营：矿用设备、铁路设备、防爆电器、防爆本质安全型麦克风、仪器仪表、路面机械、工程机械、智能制造
- 主营：矿用设备、铁路设备、防爆电器、防爆本质安全型麦克风、仪器仪表、路面机械、工程机械
- 主营：紫外辐照计、大气采样器、颗粒物采样器、麦克风、水分仪、照度计、太阳辐射计、烟尘烟气采样器、测温仪、气体检测仪、单一气体检测仪、水质水质采样器、噪声计
- 主营：视多机、直播车、慕课室、麦克风、转播车、高速磁盘、直播带货、媒资系统、usb防毒盒、录播教室、编辑系统、录播主机、非编系统、虚拟演播、光纤存储、播出系统、高速存储、管理系统、电视直播、采编播设备、导播一体机、直播一体机、多功能媒资、真三维虚拟、演播室设备、演播室系统
- 主营：测氧仪、风量罩、voc检测仪、水质测量仪、环境监测、激光粉尘、顶空分析仪、氨氮分析仪、油烟检测仪、大气采样器、皂膜流量计、水质检测仪、水质采样器、气体检测仪、气体采样器、烟气分析仪、toc分析仪器、明渠流量计、甲醛检测仪、油烟快检仪、汞蒸气检测仪、汞蒸汽检测仪、在线水质分析仪、手持式苯检测仪、生物发光光度计
- 主营：减速机、电磁阀、变频器、麦克风、东电研、传感器、编码器、控制器、触摸屏、主控板、驱动器、sss定位器、泽村电机、伺服电机、纠偏电源、承总仓库、纠偏控制器、电眼、磁粉张力
- 主营：摄像机、摄像头、网络录播、全向麦克风、会议麦克风、麦克风、会议系统、无线全向、会议设备、会议视频、会议终端、录播服务器、录播一体机、网络视频会议、视频会议软件、高清视频会议、远程视频会议、电视墙服务器、华为视频会议、电子视频会议、录播主机、录播、视频会议、跟踪摄像机
- 主营：无压风门、防水密闭门、防火栅栏门、麦克风、瓦斯稀释器、洗靴机、孔板流量计、防回火装置、瞬变电磁仪、井下电视、振动放矿机、矿用摄像仪、音视频记录仪、矿用平板车、固定式矿车、翻斗式矿车、气动绞车、调度绞车、启闭风门绞车
- 主营：视频会议系统、远程视频会议、多点控制单元、视频会议麦克风、无线麦克风、MCU、视频会议终端、一体化视频会议终端、视频会议摄像机、电视墙服务器、录播服务器、录播主机、全向麦、会议录播系统、视频会议软件、录播教室设备、多媒体视讯系统、录播一体机、音频处理器、会议音响、调音台、音柱、手拉手会议系统、功放、电源时序器
- 主营：光谱仪、激光器、光子源、测量仪、摄像头、采集卡、放大器、单色仪、护目镜、传感器、扫描镜、超稳腔、增强器、滤光片、成像仪、功率计、光纤束、示波器、鉴相器、探测器、磁强计、相位计、照度计、检测仪、激光管
- 主营：FPC插座、FPC/FFC连接器、ZIF连接器、麦克风卡侬座、排针排母、板到线、板对板、接线端子、FFC软排线、轻触开关、RJ45
- 主营：矿用设备、铁路设备、救援设备、防爆本质安全型麦克风、防爆电器、仪器仪表、路面机械、工程机械、智能制造