Calorimeter

About: Calorimeter is a research topic. Over the lifetime, 5878 publications have been published within this topic receiving 77157 citations.

An improved calorimeter for measuring the core loss of magnetic materials

Abstract: Accurate measurements of core loss for distributed-air-gap magnetic materials have traditionally been very difficult to obtain. Wattmeter measurements are affected by very small phase and time-delay measurement errors, while traditional calorimeters measure the sum of excitation winding loss and core loss. This paper presents an improved calorimeter which excludes winding loss and measures core loss alone.

Digital Signal Reconstruction in the ATLAS Hadronic Tile Calorimeter

Abstract: We present an Optimal Filtering (OF) algorithm to reconstruct the energy, time and pedestal of a photomultiplier signal from its digital samples. The OF algorithm was first developed for liquid ionization calorimeters, its implementation in scintillator calorimeters, specifically in the ATLAS hadronic Tile calorimeter (TileCal), is the aim of this study. The objective is to implement the algorithm on the DSPs of the Read Out Driver cards in order to reconstruct online the energy of the calorimeter and provide it to the second level trigger. The algorithm is tested and compared with a plain filtering algorithm using both calibration and real data from the TileCal detector. The results are promising specially in the regions where the electronic noise contributes significantly to the resolution

High-pressure isobaric heat capacities using a new flow calorimeter

Abstract: An automated flow calorimeter has been developed for the measurement of high accurate isobaric heat capacities for pure compounds and mixtures over the range 250–400 K and 0–20 MPa. The technique has been checked for different compounds and at different conditions of temperature and pressure and the results have been compared with the literature values available. The conclusion of this comparison is that the new calorimeter can measure heat capacities with an estimated total uncertainty better than 0.5%. This paper report describes the new equipment, its set-up and gives new heat capacity data for toluene and ethyl tert-butyl ether at different temperatures and pressures.

Development of the Calorimeter Heat Transfer Gauge for Use in Shock Tubes

Abstract: A heat transfer gauge suitable for measuring extremely high heat transfer rates under the quasi‐transient conditions occurring in shock tubes has been developed. The instrument is based on a calorimetric principle and is made possible by the short steady state times inherent in shock tubes. The technique developed extends, verifies, and supplements the shock tube heat transfer measurements made by thin film resistance thermometers.The operating principles and experimental experiences with calorimeter heat transfer gauges are reported in some detail.Much heat transfer data obtained with calorimeter gauges has been collected and published. Experimental measurements of laminar and turbulent heat transfer rates at velocities up to satellite speeds, approximately 26 000 ft/sec, have been reported. Heat transfer rates as high as 40 kw/cm2 have been encountered in these experiments.

Interferometric calorimeter for the measurement of water-vapor absorption

Abstract: An interferometric calorimeter has been developed to measure the optical-absorption coefficient of gases at the level of 10−10 cm−1. The system operates by measuring the phase shift on a cw He–Ne laser probe beam, which is caused by the expansion of the gas after it has been heated in the focal volume of a pulsed excitation laser beam. The minimum detectable fringe shift is approximately 2 × 10−5 waves. For a 1-J excitation laser this shift corresponds to an absorption coefficient of 2 × 10−10 cm−1. The continuum absorption of water vapor at 9466 cm−1 has been measured to be 6 × 10−10 cm−1 at a 16.5-Torr partial pressure in a 1-atm (760 Torr) N2 buffer at 30°C.