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| The OW detector consists of a sapphire disc (0.3mm thick and 13mm in diameter), the rear side of which is glued to the annular ringmade of the piezoelectric material. Sapphire is amaterial characterized by high transmission in the visible range as well as by a large thermal expansion coefficient. The concept of the OWdetection is as follows. About 0.25 cm3 fluid (or semi-fluid) sample (here watermelon homogenate) that contains the chromophore of interest isdepositedona surface of a sapphiredisc.Goodthermal contact between homogenate and the surface of the disc is required. The emission wavelength of a periodically modulated beam of radiation (often laser) is chosen such as to correspond to thewavelength at which the chromophore of interest shows appreciable absorption. The modulated radiation beam enters the rear side of thesapphire disc at a normal incidence. It penetrates through a thin disc and eventually reaches the homogenate on a top surface of the sapphire disc. The transmission of the disc should be high so that as much as possible of the incident laser power reaches the homogenate. As a result of selective excitation, heat will be generated in a homogenate leading to an increase of its temperature. Due to good thermal contact between the homogenate and a disc, the temperature of disc follows these temperature oscillations causing it to expand and contract periodically. The annular ring made frompiezoelectric lead zirconiumtitanate (PbZrxTi1−xO3) responds to these changes by generating an alternate voltage at the same modulation frequency. This voltage, termed the OWsignal, has the amplitude andphase (relative to the incident radiation).Bothcanbe readily detected using the two phase lock-in amplifier. Thermal and optical properties of the test sample and of disc, themodulation frequency, the intensity of the incident radiation, the diameter of the excitation beam, the intrinsic responsivity, and the thermalmass of piezoelectricmaterial all affect the amplitude and phase of the OW signal in a rather complex manner. The OWsignal is mainly due to the heat producedwithin the layer of homogenate, the thickness of which is approximately equal to one thermal diffusion length (see below). |
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tianenlee(金币+10, 翻译EPI+1): 2011-03-15 15:25:07
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The OW detector consists of a sapphire disc (0.3mm thick and 13mm in diameter), the rear side of which is glued to the annular ringmade of the piezoelectric material. Sapphire is a material characterized by high transmission in the visible range as well as by a large thermal expansion coefficient. 该单程探测器由一个蓝宝石碟片（厚度为0.3毫米，直径为13毫米）组成，其背面粘在一个压电材料环上。蓝宝石是一种以在可见光范围内高传输、热膨胀系数大为特点的材料。 The concept of the OW detection is as follows. About 0.25 cm3 fluid (or semi-fluid) sample (here watermelon homogenate) that contains the chromophore of interest is deposited on a surface of a sapphire disc.Good thermal contact between homogenate and the surface of the disc is required. 该单程探测器的概念是这样的：约0.25立方厘米流体（或半液体）样品（这里是指西瓜匀浆），其中所关注的生色团被聚集在蓝宝石碟片的表面。并在匀浆和碟片的表面之间需要有良好的热接触。 |
2楼2011-03-15 15:11:10
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The emission wavelength of a periodically modulated beam of radiation (often laser) is chosen such as to correspond to the wavelength at which the chromophore of interest shows appreciable absorption. The modulated radiation beam enters the rear side of the sapphire disc at a normal incidence. 一个放射物（通常是激光）定期调制光束发射波长的（正确）选择，例如与所关注的生色团的相对应的波长，会有明显的吸收（现象）。经过调制的辐射束以正常的发射率射入到这个蓝宝石碟片的背面。 It penetrates through a thin disc and eventually reaches the homogenate on a top surface of the sapphire disc. The transmission of the disc should be high so that as much as possible of the incident laser power reaches the homogenate. As a result of selective excitation, heat will be generated in a homogenate leading to an increase of its temperature. 它穿透薄薄的碟片，并最终达到在蓝宝石碟片表面上的匀浆。碟片的传输速度很快从而使尽可能多地入射激光功率射入匀浆。这种选择性激发的结果就是在匀浆中产生的热量会尽快达到它所需要的到达的温度。 |
3楼2011-03-15 15:25:44
