Apparatus and method for identifying individuals through their subcutaneous ...

(54) APPARATUS AND METHOD FOR

IDENTIFYING INDIVIDUALS THROUGH
THEIR SUBCUTANEOUS VEIN PATTERNS
AND INTEGRATED SYSTEM USING SAID
APPARATUS AND METHOD

(75) Inventor: Hwan-Soo Choi, 110-901 Jungja-dong, Bundang-gu, Seongnam, Kyeongkido, 463-010 (KR)

(73) Assignees: BK Systems, Seoul; Hwan-Soo Choi,

Kyeongkido, both of (KR)

( * ) Notice: This patent issued on a continued prosecution application filed under 37 CFR 1.53(d), and is subject to the twenty year patent term provisions of 35 U.S.C. 154(a)(2).

Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.

(21) Appl. No.: 09/055,330

(22) Filed: Apr. 6, 1998

(30) Foreign Application Priority Data

Apr. 14, 1997 (KR) 97-14162

(51) Int. CI. G06K 9 00

(52) U.S. CI 382/115

(58) Field of Search 382/115, 116,

382/117, 172, 173, 125, 124; 395/200.55; 340/825.3, 825.31, 825.34; 713/182, 186;

902/3-6

(56) References Cited

U.S. PATENT DOCUMENTS

4,699,149 * 10/1987 Rice 600/475

4,817,183 * 3/1989 Sparrow 382/125

5,787,185 * 7/1998 Clayden 382/115

5,805,723 * 9/1998 Fujiwara 382/172

5,887,140 * 3/1999 Itsumi et al 395/200.55

* cited by examiner

Primary Examiner—-Joseph Mancuso

Assistant Examiner—-Vikkram Bau

(74) Attorney, Agent, or Firm—Baker & McKenzie

(57) ABSTRACT

Disclosed is an optical current/voltage measurement apparatus comprised of an optical current/voltage sensor assembled in a unit and a light signal computing apparatus. The optical current/voltage sensor includes a linear polarizer for linearly polarizing the input light, some of which passes through the polarizer and some of which is diverted by 90°; a current sensor section; a voltage sensor section that is arranged perpendicular to the current sensor section with respect to the light path, and the light signal computing apparatus including a light receiver for transforming an input light signal into an electric signal; a pre-amplifier for amplifying the electric signal; a high-pass filter and a low-pass filter for separating an AC and a DC component from the amplified signal; an AC amplifier and a DC amplifier for amplifying each separated signal, respectively; a divider for obtaining the ratio of the two output signals from the amplifiers; and a main amplifier for amplifying the obtained value of the ratio to some level. The optical current/voltage measurement apparatus provides the advantages of having the capability of taking an accurate measurement of the current and voltage of a transmission line simultaneously without the influence of external disturbance or light distortion caused by bent of an optical fiber, to achieve a cost savings through the reduction of the number of expensive optical components and high voltage insulators, and to simplify carriage, set-up, and maintenance through reduction in the size of the circuit board forming the current/voltage sensor section.

11 Claims, 6 Drawing Sheets