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原裝丹麥GRAS麥克風(fēng)技術(shù)支持
原裝丹麥GRAS麥克風(fēng)技術(shù)支持
測量傳聲器導(dǎo)軌
選擇正確測量話筒的指南
測量話筒有多種類型,，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)測量,，例如聲級(jí)計(jì),、聲功率測量和聲輻射研究，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)用是測量封閉耦合器中的聲壓，或如左圖所示,，測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)。
測量傳聲器組
測量話筒組已經(jīng)組合在一起,，以滿足用戶的典型測量需求,。獨(dú)立于您的測量系統(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,！