Sharath Chandra L S, Lakhani Archana, Jain Deepti, Pandya Swati, Vishwakarma P N, Gangrade Mohan, Ganesan V
UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore, 452017 Madhya Pradesh, India.
Rev Sci Instrum. 2008 Oct;79(10):103907. doi: 10.1063/1.3002426.
We report here on a simple but precise thermoelectric power measurement setup that can be adapted for different environments. This setup has been extensively used for cryogen-free environment to measure a variety of samples. It is made simple to load and hold the sample between two copper blocks by a spring-shaft arrangement. The usable range of measurements is a few microV/K to a few hundreds of microV/K. The salient features of the setup in achieving good precision both in natural warm-up/cooldown and controlled measurements are (i) the continuous DeltaT control across the sample by a chromel-AuFe(0.07%) thermocouple and (ii) the measurements of emf generated across the sample and the thermocouple using a nanovoltmeter and a scanner system. The versatile nature of the setup is further demonstrated by employing it in a magnetic field environment up to 140 kOe. The precision achieved using this system is highlighted for a few systems of current interest.
我们在此报告一种简单但精确的热功率测量装置，该装置可适用于不同环境。此装置已广泛用于无低温环境中以测量各种样品。通过弹簧轴装置将样品加载并固定在两个铜块之间，操作简单。测量的可用范围是几微伏/开尔文到几百微伏/开尔文。该装置在自然升温/降温以及受控测量中实现高精度的显著特点是：（i）通过铬镍合金 - 金铁（0.07%）热电偶对样品进行连续的温差控制；（ii）使用纳伏表和扫描系统测量样品和热电偶产生的电动势。通过将其应用于高达140 kOe的磁场环境中，进一步证明了该装置的通用性。针对当前一些感兴趣的系统，突出展示了使用该系统所达到的精度。
