# US 2014/0152988 A1 · System and method for measuring the rotation angle of optical active substance > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0152988 A1 - Document ID: US20140152988A1 - Status: Published application - Kind: A1 - Application number: 13/784,947 - Filed: 2013-03-05 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Industrial Technology Research Institute - Applicants: Industrial Technology Research Institute - Inventors: CHIH-SHANG LIU; FU-CHENG YANG - Web page: https://patentgrep.com/patent/US20140152988A1 ## CPC - G01B 9/00: Measuring instruments characterised by the use of optical techniques - A61B 5/14532: {for measuring glucose, e.g. by tissue impedance measurement} - A61B 5/14558: {by polarisation} - G01N 21/21: Polarisation-affecting properties (G01N21/19 takes precedence) - A61B 3/10: Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions - A61B 5/6821: {Eye} - G01J 4/04: Polarimeters using electric detection means (G01J4/02 takes precedence) - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) ## Abstract A system for measuring the rotation angle of optical active substances has a light source, a polarization generation unit; a polarization analyzing unit; a signal generating unit, respectively and electrically coupled to the polarization generation unit and the polarization analyzing unit; a signal processing unit, electrically coupled to the electric signal generating unit; wherein the light source is enabled to emit a beam toward the polarization generation unit for enabling the beam to be polarized into an incident polarized beam while being projected and traveled in an optical path passing through an optical active substance so as to be converted into a emerging beam; and the polarization analyzing unit is positioned to receive and analyze the emerging beam so as to generate a signal to be received and processed by the signal processing unit. ## Claims ### Claim 1 A system for measuring rotation angle of optical active substances, comprising: a light source; a polarization generation unit; a polarization analyzing unit; and a signal generating unit, respectively and electrically coupled to the polarization generation unit and the polarization analyzing unit; wherein the light source is enabled to emit a beam toward the polarization generation unit for enabling the beam to be converted into an incident polarized beam; and the polarization analyzing unit is enabled to generate a signal according to a emerging beam. ### Claim 2 (depends on 1) The system of claim 1, wherein the light source is a light emitting diode. ### Claim 3 (depends on 1) The system of claim 1, wherein the beam is a beam selected from the group consisting of: a continuous wave beam, an amplitude modulation beam, and a frequency modulation beam. ### Claim 4 (depends on 1) The system of claim 1, wherein the electrical coupling is enabled by a means selected from the group consisting of: a wired connection means and a wireless connection means. ### Claim 5 (depends on 1) The system of claim 1, further comprising: a signal processing unit, electrically connected to the signal generating unit for receiving and processing the signal. ### Claim 6 (depends on 1) The system of claim 1, further comprising: a beam splitting unit, disposed at a position on the optical path of the incident polarized beam. ### Claim 7 (depends on 6) The system of claim 6, wherein the beam splitting unit is a beam splitter. ### Claim 8 (depends on 1) The system of claim 1, further comprising: a light detector, disposed at a position on the optical path of the emerging beam that is being emitted from the polarization analyzing unit. ### Claim 9 (depends on 1) The system of claim 1, wherein the polarization generation unit further comprises a polarization element and a first phase modulator; and the polarization analyzing unit further comprises: a second phase modulator, a third phase modulator, a fourth phase modulator and an analyzer. ### Claim 10 (depends on 9) The system of claim 9, wherein the signal generating unit is respectively and electrically connected to the first phase modulator, the second phase modulator, the third phase modulator and the fourth phase modulator. ### Claim 11 (depends on 9) The system of claim 9, wherein the polarization element is an element selected from the group consisting of: a polarizer and a Nicol prism; the analyzer is a polarizer; and each of the first, the second, the third and the fourth phase modulators is a phase modulation device. ### Claim 12 (depends on 11) The system of claim 11, wherein the phase modulation device is a device selected from the group consisting of: a liquid crystal retardation modulator, a photoelastic modulator, and a Babinet-Soleil compensator. ### Claim 13 (depends on 1) The system of claim 1, wherein the polarization generation unit further comprises a polarization element, a phase modulator and a wave plate; and the polarization analyzing unit further comprises: a wave plate, a phase modulator, a phase modulator and an analyzer. ### Claim 14 (depends on 13) The system of claim 13, wherein the signal generating unit is respectively and electrically connected to the phase modulators. ### Claim 15 (depends on 13) The system of claim 13, wherein the wave plate is a quarter-wave plate, the analyzer is a polarizer, the phase modulator is a phase modulation device and the polarization element is an element selected from the group consisting of: a polarizer and a Nicol prism. ### Claim 16 (depends on 15) The system of claim 15, wherein the phase modulation device is a device selected from the group consisting of: a liquid crystal retardation modulator, a photoelastic modulator, and a Babinet-Soleil compensator. ### Claim 17 A method for measuring rotation angle of optical active substances, comprising the steps of: projecting a beam toward a polarization generating unit for converting the beam into an incident polarized beam; receiving a emerging beam from the substance so as to be used as basis for generating a signal; and converting the signal into a rotation angle data. ### Claim 18 (depends on 17) The method of claim 17, wherein the beam is characterized by a wavelength ranged between 600 nm and 1700 nm. ### Claim 19 (depends on 17) The method of claim 17, wherein the beam is a beam selected from the group consisting of: a continuous wave beam, an amplitude modulation beam, and a frequency modulation beam. ### Claim 20 (depends on 17) The method of claim 17, wherein the signal is received by a signal processing unit so as to be used as basis for generating the rotation angle data. ### Claim 21 (depends on 20) The method of claim 20, wherein the signal processing unit employs a means selected from the group consisting of a Stokes parameter analysis and a normalization analysis, for generating the rotation angle data.