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新技术为压差传感器技术注入生机 - China Medical Device Manufacturer
CMDM

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Wed, January 17th, 2018

2009年10月CMDM电子快讯 » 技术新知
新技术为压差传感器技术注入生机

By: Bob Michaels

Microbridge公司的温差式风速仪型气流传感器可减小最终产品的包装尺寸,提高低压差的测定性能。

在医疗器械行业,微型化就是技术发展的终极目标,对于手持式器械更是如此。但是,为了适应器械尺寸不断变小的趋势,部件制造商总是处于设计微型部件的压力之下。Microbridge Technologies Canada公司 (www.mcbridgetech.com)就是这样一家企业,他们研制出一种温差式风速仪型气流微传感器,据其介绍,该传感器可减小最终产品的包装尺寸,提高低压差的测定性能。

“这种压差传感器非常适合在测量人体呼吸活动的气流装置中使用,”Microbridge公司的技术总监(CTO)Les Landsberger解释说。该传感器可整合到多种测量呼吸活动的医疗器械中,例如:人工肺呼吸器、肺活量计、睡眠呼吸暂停监测装置和氧气呼吸器,他补充道。

一种压差传感器技术利用死端膜的偏转作用测量压力。但是,为了使其获得足够的灵敏度,以便测量呼吸设备中所需的低水平压差,这种膜必须非常薄,非常大,或者又薄又大。该膜难以生产,而且导致生产的传感器尺寸很大,成本高昂。

Microbridge公司的传感器技术与此截然不同,在该技术中,加热部件两端各围绕一只电阻器,当少量空气流经加热部件内管道时即可测量压力。受热的空气被由某个方向传来的气流替代,进而使两个电阻器的温度失衡。空气流过管道的速度取决于管道两端之间的压差以及管道的流阻。

尽管压差传感器内的空气流道通常位于外周包装或外壳上,但Microbridge公司的产品却具有集成式空气流道设计,并且流道尺寸和排列均可控制。该设计减少了必须流过加热部件的空气量,也减少了传感器的空气泄漏。该传感器可测量呼吸管上两点之间的压差,并可以此代表呼吸流量,Landsberger解释说。

该传感器不仅体积小,灵敏度高,而且可现场更换,无需校准。其压力量程取决于模具水平的流阻和芯片放大情况。由于具有模拟CMOS信号调节电路并且可通过重调节器(Rejustor)获得模拟适应性,传感器的补偿和放大均可在芯片上进行调节。

“由于我们的传感器能够做得比竞争对手的产品更小,因此可用于那些家用和便携式医疗器械中,”Landsberger说道。“由于其气流泄漏少,因而运转时与死端膜型传感器类似。另外,它还可方便灵活地与滤器或连接软管搭配使用。”


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