TY  - SER
AU  - Viraphan Samadi
AU  - Manukid Parnichkun,
AU  - Pandey,P.C.
AU  - Afzulpurkar,Nitin V.
TI  - Development of a laser range finder for manufacturing control
T2  - Thesis
PY  - 1998///
CY  - Bangkok
PB  - Asian Institute of Technology
KW  - Process control
N1  - A thesis submitted in partial fulfillment of the requirements for the degree of Master of  Engineering, School of Advanced Technologies; Thesis (M.Eng.) - Asian Institute of Technology, 1998
N2  - In this study a Laser Range Finder (LRF) was developed and a mathematical relation was estab lished between object distance and PSD (Position Sensitive Detector) voltage output.  LRF is a single point optical triangulation instrument, which provides distance information quickly  and easily without touching the object being measured. This kind of instrument is available in  today's market. But it is limited to a short range (max. range about 400 millimeters). And the  nonlinearity is inherent in this kind ofinstrument, resulting the accuracy and resolution are chang ing nonlinearly with the distance. As distance of the object being measured increase as the accu racy and resolution decrease. The LRF was developed to achieve longer operation range (one  meter or more). To improve the instrument accuracy and resolution at long range, multi mode  measurement scheme was introduced and implemented. This method simply magnifies the PSD  output voltage at long range before feeding it to ADC (analog to digital converter). This method  showed the ability to make the resolution finer considerably depending on the number of mode  being used.
UR  - http://203.159.5.9/ait-thesis/detail.php?q=B13271
ER  -