Tohru Iuchi, Atsushi Gogami
UNCERTAINTY IN THE TEMPERATURE OF SILICON WAFERS MEASURED BY RADIATION THERMOMETRY BASED UPON A POLARIZATION TECHNIQUE

The emissivity behaviour of a silicon wafer under various conditions was theoretically and experimentally investigated. As a result, the quantitative relationship between the ratio of p-polarized radiance to s-polarized one, and polarized emissivities was obtained irrespective of the emissivity change of wafers due to the oxide film thickness under the wide variations of resistivity. Based on the result, we propose a new radiation thermometry method that can measure both the temperature and the spectral polarized emissivity of the silicon wafer, and estimate the uncertainty of the measurements. Currently, the uncertainty of the temperature measurement is estimated to be 3.52 K (k = 2) and 3.80 (k = 2) for p-polarization and s-polarization, respectively, in the temperature range over 900 K.

Sung Hun Lee, Han Young Ryu, Yong Pyong Kim, H. Suh
ULTRA STABLE COHERENT SOURCES BASED ON INJECTION LOCKED DFB FROM A FEMTOSECOND FIBER LASER COMB

We propose ultra stable coherent laser sources based on optical injection locked single mode of the femtosecond fiber laser comb. The source is discretely tunable coherent optical sources by two DFB lasers, which are injection-locked to a respective single mode of the fiber laser comb with the frequency difference of 500 MHz, that is exactly twice of the comb repetition frequency.

Rob Haines, Michael Bair
A METHOD OF TRACEABILITY FOR A FPG8601 FORCE BALANCED PISTON GAUGE TO DEFINE PRESSURES IN THE RANGE FROM 1 PA TO 15 KPA IN GAUGE AND ABSOLUTE MEASUREMENT MODES

The FPG8601 has become an important reference for many primary measurement laboratories in a pressure range from approximately 1 Pa to 15 kPa in both gauge and absolute measurement modes. The FPG8601 measurement range spans the gap between the traditional measurement regimes of "pressure" and "'vacuum", a range where other primary pressure standards either do not exist or do not have uncertainties sufficient to support the FPG8601 traceability. The limitations of available primary standards create a challenge for FPG8601 users needing to define traceability in this range. This paper suggests a method of maintaining traceability using force, dimensional and primary pressure measurements in a manner different from that normally used for traditional "floating" piston gauges.

Torben Licht, Sven Erik Salbøl
ISO 16063-11: UNCERTAINTIES IN PRIMARY VIBRATION CALIBRATION BY LASER INTERFEROMETRY. REFERENCE PLANES AND TRANSVERSE MOTION

Primary vibration calibration by laser interferometry using quadrature outputs has been used for the last 10-15 years. The ISO 16063-11 was published in 1999 and this has increased the interest further.
With new compact laser interferometers the difficulties of optical alignment and adjustment has been practically eliminated and dedicated software has made the process automatic, permitting to gather much more data.
In most cases it is applied to reference transducers, either single-ended or meant for back-to-back calibration.
However the problem that the laser beam not always can be directed towards the point or surface to which it ideally should be directed, introduces errors that can be quite significant. At low frequencies this is often due to non-ideal exciter motions. At high frequencies it is often due to relative motion between points on apparently rigid mechanical structures or rocking or bending motion of the combined structures.
Some examples and solutions to these problems including uncertainty calculations will be presented.

Enilson José Costa, Raimundo C. S. Freire, João Bosco Silva, Carlos Magno Cursino, Cláudio Oliveira, Bruno A. M. Pereira, Roniere F. L. Silva
HUMIDITY CONTROL SYSTEM IN NEWBORN INCUBATOR

In this work they were developed a microcontrolled system devoted to the newborn incubator, in order to check the conditions of the environment provided to the premature newborns, a humidity control system and software that carries out the reading of the sensors. Two microprocessed, similar newborn incubator were used, for the realization of the measurements, being that one of the newborn incubator used distilled water and other one was valued without water. The measures were collected to each 2 minutes during 96 hours. The relative humidity inside newborn incubator without water and with water but, without humidity control, goes out from the band of comfort established by standard. With water and humidity control, if it kept inside established band of comfort by standard. One checked that the newborn incubator used in this inquiry does not provide to the premature newborns a totally appropriate environment taking into account the requisites of the standard NBR IEC 601-2-19.