MEASUREMENT SYSTEM OF A TISSUE'S OPTICAL PROPERTIES USING MULTI-WAVELENGTH LASER SOURCE AND MULTI-WAVELENGTH LASER SOURCE

• Main Authors: HAN, SEUNG HEE, KIM, JONG UK, LEE, KYEONG HEE, PARK, YANG HA
• Format: Patent
• Language: English
• Published: 17.01.2008
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

A multi-wavelength laser source and a measurement system of tissue optical properties using thereof are provided to enable selective wavelength projection within a range of 300~900nm depending on the measured properties of objective tissue for each part of a human body in real time, thereby ensuring accurate and wide measurement range. A measurement system measurement system of tissue optical properties comprises a multi-wavelength laser source(101), a 90% reflector(105,106), a chopper(107), an integrating sphere(108), and a lock-in amplifier(112). The multi-wavelength laser source allows wavelength selection depending on the tissue properties of objective tissue to be measured. The 90% reflector adjusts the direction a beam projected from the multi-wavelength laser source. The chopper transmits a reference signal to a lock-in amplifier. The integrating sphere measures the projection and reflectance value of the light source. The lock-in amplifier converts the measured signal and reference signal into digital signals. The multi-wavelength laser source comprises an excitation light source(102) for excitation of dye laser, 12 tunable dye lasers(103) showing absorbers and absorption lines within tissues from 300~900nm zone onto an epicyclic wheel, and a laser intensity filter(104) for intensity adjustment of the dye lasers.