Noise thermometer

H.V.Brixy*; Kakuta, Tsunemi

JAERI-Review 96-003, 77 Pages, 1996/03

JAERI-Review-96-003.pdf:3.21MB

no abstracts in English

Outline of air-cooling thermal transient test facility

*; *; Uno, Tetsuro*

PNC TN9410 86-029, 68 Pages, 1986/02

PNC-TN9410-86-029.pdf:12.61MB

A new test facility "Air-Cooling Thermal Transient Test Facility" (ATTF) was constructed at O-arai Engineering Center. This test facility is utilized, in the first place, for evaluating the strength of outlet tube-sheets of steam generators of FBR Plants. The objectives of the tube-sheet model tests are as follows. The first is to investigate and evaluate the strain concentration in the plastic region. The second is to confirm the adequacy of the design criteria for the prototype reactor MONJU. The third is to confirm the safety margin for failure incorporated in the design evaluation methods. ATTF can impose severe thermal loadings (only cold shock) on the test specimens. The facility produces compressed air (Max. 35kg/cmG) by two large-sized compressors, and stores it in a storage tank (about 60m). After a test specimen is heated up to the aimed temperature the compressed air passes through the test specimens quickly by opening the valve to apply cold shock and is released in the atmosphere. Each main loop pipe is 8 inches in diameter and the flow rate is max. 10kg/s in compressed air. The most severe down thermal transient condition is from 550C to 150C (for tube-sheet model) in about 4 min. The test section can be modified for various kinds of structures, which should be air-tight and have the maximum pressure of 8kg/cmG. The facility is operated automatically by two sequencer controllers. One of the main features of ATTF is the adoption of compressed air instead of sodium as coolant. By using compressed air, various kinds of sensors which can not be used in the sodium environment can be used in ATTF; particularly strain gages can be used effectively to obtain strain distribution for thermal transient condition, and the location as well as the mode of failure of test specimens can be recognized easily through the detection of crack initiation and the observation of crack growth. ATTF is expected to be a powerful ...

Toward user-friendly thermal radiometers; Microfabrication of novel photo-thermal sensors and broadband ultra-black absorbers

Amemiya, Kuniaki*; Koshikawa, Hiroshi; Yamaki, Tetsuya; Maekawa, Yasunari; Shitomi, Hiroshi*; Kinoshita, Kenichi*; Numata, Takayuki*; Tanabe, Minoru*; Fukuda, Daiji*

no journal, , 

A thermal radiometer absorbs all incoming photons and has a high sensitivity to detect the resulting temperature rise. The big challenges here were insufficient mechanical stability of broadband ultra-black absorbers and low sensitivity of photo-thermal sensors. We developed a robust optical absorber and low-noise photo-thermal sensor by new microfabrication techniques. The optical absorbers had micrometer-sized surface structures of chemically-etched ion tracks on CR-39 plastic and hard carbon coating as an optical absorption layer, therefore, exhibiting a spectral reflectance suppressed to below 1% in the ultra-violet to near infrared range of wavelengths. Importantly, they were never made susceptible to dust blow off as well as to mechanical contact. The photo-thermal detectors were equipped with the bimetal MEMS system, which can sensitively respond to thermally-induced deformation. They were found sensitive enough to reach almost the theoretical limit.