Advanced Convolution Denoising Techniques for Large-Volume Seebeck Calorimeters

Cutting-edge research on convolution denoising methods for Seebeck calorimeters to reduce noise levels caused by temperature fluctuations. The study explores hardware design, mathematical principles, and examples of denoising applications, aiming to enhance measurement accuracy and stability in large-volume calorimetry setups.

• Seebeck calorimeters
• Convolution denoising
• Temperature fluctuations
• Large-volume measurements
• Calorimetry stability

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1. Convolution denoising of large volume Seebeck calorimeters Wu-Shou Zhang Institute of Chemistry, CAS Beijing 100190, China wszhang@iccas.ac.cn ICCF-23, Xiamen, China, 2021.6.9-11

2. Seebeck envelope calorimeter (SEC) Letts 2019 Storms 2003 Water Jacket Thermal Insulation Water Jacket Thermocouples Sisik & Nagel, JCMNS 33 (2020) 234

3. A problem: big noise Standard Deviation: 2.8 mV or 37 mW for SEC2014 p-p value: 0.3 W Reason: fluctuation of bath temperature ( 0.005 C )

4. Design of hardware Schematic diagram Photo of Reference cell Schematic of Reference cell

5. Math principle. Example 1: SEC2014 (a) Changes of bath temperature, output signals of SEC and reference cell; (b) Response function after deconvolution; (c) Convolution denoising of SEC baseline (e.g. p-p value changes from 21 mV to 0.14 mV (0.67%) after denoising around 13 hr. It is equivalent to bath temperature stability reduced to 33 C ( 5 m C for water bath).

6. Math principle. Example 2: SEC2007 (a) Changes of bath temperature, output signals of SEC and reference cell; (b) Response function after deconvolution; (c) Convolution denoising of SEC baseline (e.g. p-p value changes from 10.56 mV to 0.19 mV after denoising around 101.725 hr. It is equivalent to temperature stability = 2 10 4 C ( 0.01 C for water bath).

7. Example 2: SEC2007 Up-left: calibration of SEC Up-right: P/W = 5.75676V + 0.1766V2, 2 =1.49 10 6, R2 = 1, SD = 1.7 mW (<< 30 mW originally). Down-right: response of SEC with power pulse of 30 mW.

8. Meanings of convolution-denoising for large SEC Twin-cell (Calvet) Present work physics math Principle Denoising passive active method = 1 << 1 Vreference/Vsample Requirement of High stability Basic stability bath temperature

9. New calorimeter based on new principles Sample room: 60(W) X 19(H) X 30(D) cm3 (34 L) Power range: mW to kW @ 20 C Zhang: China Patent #201810191597.0

10. Thank you!