Conveners
A8: Instrument I
- Narongrit Maneejiraprakarn (Department of Physics, Faculty of Science, Naresuan University)
A8: Instrument I
- Anucha Kaewpoonsuk (Naresuan Univerisity)
The diameter measurement of sphere is very important in dimensional metrology. However, most of diameter measurement carried out by using 2 points method measuring distance from opposite site of the sphere. For work which require high accuracy or the mating part where the contact area cover the large area of the object, form error of the part is need to be determined. One of the mostly use...
Glass fragments are one of evidence that can be found in many crime scenes and used to include or exclude suspects or victims from the criminal event. For many years, a typical method known as a sink-float method has been used in many investigation laboratories to prove the correspondence between the questioned glass fragments and the reference ones by matching their density values. However,...
The ADMI color scale is developed to measure the color of wastewater as an indicator of water quality. ADMI color is a metric quantity based on the Adams Nickerson color difference between the APHA/Pt-Co liquid standards and water. The Adams Nickelson color formula is obtained by transforming CIE tristimulus color indices into a uniform metric color scale that is independent of hue. If two...
Non-contact absolute thickness measurement is necessary especially to delicate specimen or optics where deformation and scratch must be avoided. The absolute thickness of a specimen can be measured using various optical methods but the refractive index of the specimen shall be pre-determined with high accuracy. In this paper, we applied an optical-domain interferometer using an optical...
Flatness is one of the key components that determine quality of the mating parts. It also can be used to interpret performance of the production process or the machine tools. Orientation and fixture used in holding the object also affect flatness of the surface. This paper investigated effect of the mounting configuration to flatness of the flat surface. Flatness of the optical flat diameter...
Nowadays, the water flow measurement involves in our daily life such as water meters for tap water, hydrocarbon flow meters at petrol stations, etc. Those flow meters have to be calibrated by higher accuracy equipments with the accredited calibration laboratory. Therefore the accreditation laboratory has to complete the measurement comparison with reliable laboratory or the National Institute...
A photoplethysmography (PPG) is one of an alternative technique for monitoring personal health with the advantages of non-invasive, inexpensive, and easy to use. In this work, PPG is used to estimate blood pressure with the aim to construct a prototype of blood pressure monitor by photoplethysmography and calibrate with upper-arm blood pressure monitor. The NIR LED light source, and detector...
The flow and volume of liquid laboratory of the National Institute of Metrology, Thailand (NIMT) has developed the latest facility which covers the liquid flow measurement range from (10 – 1,000) mL/h. This facility has been developed according to the need of high accuracy equipment in several of industries such as pharmaceutical products, fuel cell, semiconductor and medical devices. For...
A NIMT optical frequency comb was compare with an Er-fiber laser comb with repetition frequency of 250 MHz made by the Center for Measurement Standards (CMS), Taiwan by simultaneously measuring the frequency of a 633 nm He-Ne laser. The difference of average frequency measurement is 283 Hz and corresponds to a relative difference of 6.0x10-13.
