原裝丹麥GRAS麥克風(fēng)技術(shù)支持

測(cè)量傳聲器導(dǎo)軌

選擇正確測(cè)量話筒的指南

測(cè)量話筒有多種類型，涵蓋各種頻率范圍、動(dòng)態(tài)范圍和應(yīng)用場合。GRAS測(cè)量話筒是世界上好的。

通過本指南，您可以找到為您的應(yīng)用選擇合適的測(cè)量麥克風(fēng)的幫助。介紹如何選擇外極化或預(yù)極化話筒、自由場、壓力或隨機(jī)入射話筒，以及了解話筒的動(dòng)態(tài)范圍和話筒的頻率范圍.

外極化話筒

這些麥克風(fēng)與標(biāo)準(zhǔn)前置放大器一起使用，如GRAS 26AK，它有一個(gè)7針LEMO連接器。前置放大器必須連接到電源模塊（例如GRAS 12AK）或分析儀輸入端，該模塊可為前置放大器提供電源，并為麥克風(fēng)振膜提供200 V極化。

外極化麥克風(fēng)是準(zhǔn)確和穩(wěn)定的，是非常關(guān)鍵的測(cè)量選擇。

預(yù)極化話筒

這些麥克風(fēng)通常與CCP（恒流功率）前置放大器（如GRAS 26CA）一起使用。預(yù)極化麥克風(fēng)必須連接到

CCP傳感器的輸入級(jí)或由CCP電源供電，例如GRAS 12AL。CCP前置放大器使用標(biāo)準(zhǔn)同軸電纜，從而降低成本。另一方面，預(yù)極化話筒的長期穩(wěn)定性和高溫穩(wěn)定性不如外極化話筒。

自由場傳聲器或壓力傳聲器或隨機(jī)入射傳聲器

你應(yīng)該選哪一個(gè)？

測(cè)量話筒有三種類型：自由場、壓力和隨機(jī)入射。

您可以看到這三種測(cè)量話筒在較高頻率下的差異，在較高頻率下，話筒的大小與被測(cè)聲音的波長相當(dāng)。

自由場話筒

自由場麥克風(fēng)的設(shè)計(jì)基本上是為了測(cè)量聲壓，就像麥克風(fēng)被引入聲場之前一樣。在較高的頻率下，麥克風(fēng)本身在聲場中的存在會(huì)干擾局部聲壓。自由場話筒的頻率響應(yīng)已經(jīng)過仔細(xì)調(diào)整，以補(bǔ)償對(duì)局部聲場的干擾。（另請(qǐng)參見隨機(jī)入射話筒）。對(duì)于大多數(shù)聲壓級(jí)測(cè)量，例如聲級(jí)計(jì)、聲功率測(cè)量和聲輻射研究，建議使用自由場話筒。

壓力傳聲器

壓力傳聲器用于測(cè)量傳聲器振膜表面的實(shí)際聲壓。一個(gè)典型的應(yīng)用是測(cè)量封閉耦合器中的聲壓，或如左圖所示，測(cè)量邊界或墻壁處的聲壓；在這種情況下，傳聲器構(gòu)成墻的一部分，并測(cè)量墻壁本身的聲壓。建議將壓力傳聲器與GRAS RA0045 IEC 60318-4和RA0038 IEC 60318-5，2cc耦合器等耦合器一起使用，并用于封閉腔體內(nèi)聲壓的研究。

隨機(jī)入射話筒

隨機(jī)入射麥克風(fēng)用于測(cè)量聲場，其中聲音來自多個(gè)方向，例如在混響室或其他高反射環(huán)境中測(cè)量時(shí)。聲波在各個(gè)方向上的分布取決于這些聲波在各個(gè)方向上的分布。對(duì)于測(cè)量傳聲器，基于統(tǒng)計(jì)考慮確定了標(biāo)準(zhǔn)分布；由此產(chǎn)生了標(biāo)準(zhǔn)化的隨機(jī)入射傳聲器。根據(jù)ANSI標(biāo)準(zhǔn)，隨機(jī)入射通常用于聲壓級(jí)測(cè)量。

麥克風(fēng)的動(dòng)態(tài)范圍

麥克風(fēng)可以處理哪些級(jí)別？

傳聲器的動(dòng)態(tài)范圍定義為麥克風(fēng)可以處理的低電平和高電平之間的范圍

這不僅是話筒本身的功能，也是話筒使用的前置放大器的功能。麥克風(fēng)的動(dòng)態(tài)范圍在很大程度上與它的靈敏度直接相關(guān)。

測(cè)量傳聲器組

測(cè)量話筒組已經(jīng)組合在一起，以滿足用戶的典型測(cè)量需求。獨(dú)立于您的測(cè)量系統(tǒng)和應(yīng)用程序，您應(yīng)該能夠找到一套適合您的需要。麥克風(fēng)組可直接連接到所有專業(yè)測(cè)量系統(tǒng)，如圖所示，它們可用于CCP和7針LEMO輸入。

如果您的測(cè)量平臺(tái)支持符合ieee1451.4（TEDS）的智能傳感器，您可以簡單地插入麥克風(fēng)，它們將通過其特定的屬性、類型和校準(zhǔn)數(shù)據(jù)來識(shí)別自己。多渠道用戶特別喜歡的功能。

CCP機(jī)組使用高質(zhì)量同軸電纜，而LEMO機(jī)組使用特殊的軟型多芯屏蔽電纜。如果要使用延長電纜，則應(yīng)考慮對(duì)高頻和動(dòng)態(tài)范圍的可能影響。

所有話筒組作為一個(gè)單元交付，并進(jìn)行相應(yīng)校準(zhǔn)。成套設(shè)備隨附校準(zhǔn)圖，包括整套裝置的靈敏度值和頻率響應(yīng)曲線。因此，靈敏度值可直接用于系統(tǒng)設(shè)置。

為了頻繁驗(yàn)證測(cè)量鏈，需要一個(gè)聲源。GRAS為此提供了一個(gè)114分貝的聲音校準(zhǔn)器。根據(jù)使用情況和您的內(nèi)部質(zhì)量控制要求，我們建議至少每兩年重新校準(zhǔn)一次。為了更準(zhǔn)確的驗(yàn)證，我們建議使用活塞式電話進(jìn)行校準(zhǔn)。GRAS提供114dB和134dB皮斯頓電話。此外，我們建議根據(jù)可靠的基準(zhǔn)校準(zhǔn)聲源。GRAS提供校準(zhǔn)服務(wù)，并建議每兩年進(jìn)行一次校準(zhǔn)。

GRAS為特定行業(yè)提供各種特殊設(shè)計(jì)的聲學(xué)傳感器和配件。這些產(chǎn)品或根據(jù)標(biāo)準(zhǔn)或特殊用途設(shè)計(jì)，但定制解決方案在產(chǎn)品組合中占很大份額。

自1994年以來，我們一直在不斷擴(kuò)大我們的業(yè)務(wù)范圍，現(xiàn)在我們已經(jīng)在一個(gè)市場上建立了良好的地位，我們的客戶致力于聲音設(shè)計(jì)和噪音阻尼。我們的客戶群主要集中在消費(fèi)音頻和電子產(chǎn)品、聽力學(xué)、汽車和航空航天領(lǐng)域。

原裝丹麥GRAS麥克風(fēng)技術(shù)支持

GRAS 46BG-FV 1/4" CCP Pressure Front Vented Microphone Set, High Pressure

GRAS 46BL 1/4" CCP Pressure Standard Microphone Set, High Sensitivity

GRAS 46BD-FV 1/4" CCP Pressure Standard Microphone Set, Front Vented

GRAS 46BE 1/4" CCP Free-field Standard Microphone Set

GRAS 46DD-FV 1/8'' CCP Pressure Standard Microphone Set, Front Vented

GRAS 46BL-HT 1/4" CCP Pressure High Temperature Microphone Set, High Sensitivity

GRAS 46BG 1/4" CCP Pressure Standard Microphone Set, High Pressure

GRAS 46DE 1/8'' CCP Pressure Standard Microphone Set

GRAS 46BD-S1 1/4" CCP Pressure Standard Microphone Set with SMB connector

GRAS 46AR 1/2'' LEMO Random Incidence Standard Microphone Set

GRAS 46AC 1/2'' LEMO Free-field Standard Microphone Set, Wide Frequency

GRAS 46DP-1 1/8" LEMO Pressure Standard Microphone Set

GRAS 46AG 1/2'' LEMO Pressure Standard Microphone Set

GRAS 46BH-1 1/4" LEMO Pressure Standard Microphone Set, High pressure

GRAS 46DD 1/8'' CCP Pressure Standard Microphone Set

GRAS 46AZ 1/2'' CCP Free-field Standard Microphone Set, Low Frequency

GRAS 46AP 1/2" LEMO Pressure Standard Microphone Set, High Sensitivity

GRAS 46AO 1/2'' CCP Pressure Standard Microphone Set

GRAS 146AE 1/2'' CCP Free-field Rugged Microphone Set

GRAS 46AE 1/2'' CCP Free-field Standard Microphone Set

GRAS 46AD 1/2" CCP Pressure Standard Microphone Set, High Sensitivity

GRAS 46AF 1/2'' LEMO Free-field Standard Microphone Set

GRAS 46AM 1/2'' CCP Free-field Standard Microphone Set, Wide Frequency

GRAS 46BD 1/4" CCP Pressure Standard Microphone Set

GRAS 46AN 1/2'' LEMO Free-field Standard Microphone Set, Low Frequency

GRAS 46BP-1 1/4" LEMO Pressure Standard Microphone Set

GRAS 46BF-1 1/4" LEMO Free-field Standard Microphone Set

GRAS 40AM 1/2" Prepolarized Free-Field Microphone, Wide Frequency

GRAS 40AU-1 1/2" Ext. Polarized Reference Pressure Microphone

GRAS 40BD-FV 1/4" Prepolarized Pressure Microphone, Front Vented

GRAS 40BD 1/4" Prepolarized Pressure Microphone

GRAS 40BE 1/4" Prepolarized Free-Field Microphone

GRAS 40BH 1/4" Ext. Polarized Pressure Microphone, High Pressure

GRAS 40BE-FV 1/4" Prepolarized Free-Field Microphone, Front Vented

GRAS 40BF 1/4" Ext. Polarized Free-field Microphone

GRAS 40AP-FV 1/2" Ext. Polarized Pressure Microphone, High Sensitivity, Front Vented

GRAS 40BP-FV 1/4" Ext. Polarized Pressure Microphone, Front Vented

GRAS 40BP 1/4" Ext. Polarized Pressure Microphone

GRAS 40DD 1/8" Prepolarized Pressure Microphone

GRAS 40AZ 1/2" Prepolarized Free-field Microphone, Low Frequency

GRAS 40AR 1/2" Ext. Polarized Random Incidence Microphone

GRAS 40AQ 1/2" Prepolarized Random Incidence Microphone

GRAS 40AO-FV 1/2" Prepolarized Pressure Microphone, Front Vented

GRAS 40AG 1/2" Ext. Polarized Pressure Microphone

GRAS 40AO 1/2" Prepolarized Pressure Microphone

GRAS 40AC 1/2" Ext. Polarized Free-field Microphone, Wide Frequency

GRAS 40AD 1/2" Prepolarized Pressure Microphone, High Sensitivity

GRAS 40AE 1/2" Prepolarized Free-Field Microphone

GRAS 40AF 1/2" Ext. Polarized Free-field Microphone

GRAS 40AP 1/2" Ext. Polarized Pressure Microphone, High Sensitivity

GRAS 40AN 1/2" Ext. Polarized Free-field Microphone, Low Frequency

GRAS 40DP 1/8" Ext. Polarized Pressure Microphone

GRAS 40EN 1" Ext. Polarized Pressure Microphone

GRAS 40EU 1" Ext. Polarized Reference Pressure Microphone

GRAS 26AA 1/4" Preamplifier with Integrated Cable for Intensity Probes

GRAS 26CA-HT 1/2'' CCP High Temperature Preamplifier with BNC Connector

GRAS 26CI 1/2'' CCP Preamplifier with BNC Connector, Low Frequency

GRAS 26CC 1/4" CCP Standard Preamplifier with SMB Connector

GRAS 26CK 1/2” CCP Standard Preamplifier with Microdot Connector, Very Short

GRAS 26CF 1/2'' CCP Preamplifier with BNC Connector, Gain and Filters

GRAS 26CA 1/2'' CCP Standard Preamplifier with BNC Connector

GRAS 26CB-HT 1/4" CCP Standard Preamplifier with Microdot Connector

GRAS 26CB 1/4" CCP Standard Preamplifier with Microdot Connector

GRAS 26AS 1/4" Standard Preamplifier with 3 m Integrated Cable, Very Short

GRAS 26AM 1/2'' Standard Preamplifier with 3 m integrated cable

GRAS 26AL 1/4" SysCheck Preamplifier with 3 m integrated cable

GRAS 26AK-S1 1/2'' Preamplifier with Integrated Connector, Low Frequency

GRAS 26AB 1/4''-1/2'' Universal Preamplifier with Integrated Connector

GRAS 26AC-1 1/4" Standard Preamplifier with Integrated Miniconnector

GRAS 26AH 1/2'' SysCheck Preamplifier with 3 m integrated cable

GRAS 26AI 1/2'' Preamplifier with Integrated Connector, Low Frequency

GRAS 26AJ 1/2'' SysCheck Preamplifier with integrated connector

GRAS 26AK 1/2'' Standard Preamplifier with Integrated Connector

GRAS 26AR 1/4" Standard Preamplifier with Integrated Mini-connector

GRAS 26CS 1/4" CCP GRAS 43BA-2 1/4" 0.4cc CCP High Frequency Coupler Kit

Standard Preamplifier with Microdot Connector, Very Short

GRAS 26HG 1/4" Preamplifier with 3 m Integrated

GRAS 43BA-3 1/4" 0.4cc CCP High Frequency Coupler Kit, High Sensitivity

GRAS 43BB Low-noise Ear Simulator System

GRAS 43AI CCP Ear Simulator for Production Testing Based on ITU-T Rec. P57 Type 3.2 High-leak

GRAS 43AH CCP Ear Simulator for Production Testing Based on ITU-T Rec. P57 Type 3.2 Low-leak

GRAS 43AF-S1 1'' 6cc Coupler Kit According to IEC 60318-3 with 26AB Preamplifier

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GRAS 43AG Ear & Cheek Simulator

GRAS 43AF 1'' 6cc Coupler Kit According to IEC 60318-3

GRAS 43AA Ear Simulator Kit According to IEC 60318-1 & -2

GRAS 43AA-S2 CCP Ear Simulator Kit According to IEC 60318-1 & -2

GRAS 43AB 1/2'' 2cc Coupler Kit According to IEC 60318-5

GRAS 43AC Ear Simulator Kit According to IEC 60318-4

GRAS 43AC-S1 CCP Ear Simulator Kit According to IEC 60318-4

GRAS 43AD Ear Simulator Kit According to ITU-T Rec. P57 Type 1

GRAS 43AE Ear Simulator Kit According to ITU-T Rec. P57 Type 3.2

GRAS 43BA-1 1/4" 0.4cc High Frequency Coupler Kit

GRAS 43BB-1 Low-noise Ear Simulator System

GRAS 40PH CCP Free-field Array Microphone

GRAS 40PK CCP Free-field QC Microphone, ShortGRAS 40PK CCP Free-field QC Microphone, Short

GRAS 40LA 1/4" CCP Precision Surface Microphone, High Pressure

GRAS 40PP-S1 CCP Free-field QC Microphone, High Pressure

GRAS 40PS-1 CCP Surface Microphone

GRAS 40PL CCP Free-field Array Microphone, High Pressure

GRAS 40HT 1/2'' Lownoise Microphone System for Confined Spaces

GRAS 40SC CCP Probe Microphone

GRAS 40PP CCP Free-field QC Microphone

GRAS 40LS 1/4" CCP Precision Surface Microphone

GRAS 41AC-3 CCP Outdoor Microphone for Community & Airport Noise

GRAS 40PL-1 Short CCP Free-field Array Microphone, High Pressure

GRAS 46AZ 1/2'' CCP Free-field Standard Microphone Set, Low Frequency

GRAS 47AC 1/2" CCP Infra-Sound Microphone Set

GRAS 41AM Permanent Outdoor Microphone System for airport noise

GRAS 47AX 1/2'' CCP Flush-mount Microphone Set

GRAS 50AI-B 1/2" LEMO Intensity Probe

GRAS 50AI-C 1/2" LEMO Intensity Probe

GRAS 50AI-C 1/2" LEMO Intensity Probe

GRAS 47DX 1/8” CCP Flush-mount Microphone Set

GRAS 47AD 1/2'' CCP Flush-mount Microphone Set, High Sensitivity

GRAS 50AI-D 1/2" LEMO Intensity Probe

原裝丹麥GRAS麥克風(fēng)技術(shù)支持

我司坐落于上海繁華地段，在德國美國有自己的分公司，經(jīng)營各大歐美品牌進(jìn)口工業(yè)配件。源頭采購，各類產(chǎn)地、產(chǎn)品資質(zhì)齊全！