# US 2013/0155412 A1 · Spectrum detecting device and method for operation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0155412 A1 - Document ID: US20130155412A1 - Status: Published application - Kind: A1 - Application number: 13/633,569 - Filed: 2012-10-02 - Published: 2013-06-20 - Earliest claimed: 2011-12-19 - Assignees: Industrial Technology Research Institute - Inventors: Kuang-Po Chang; Shu-Yi Wang - Web page: https://patentgrep.com/patent/US20130155412A1 ## CPC - G01J 3/2889: {Rapid scan spectrometers; Time resolved spectrometry} - G01J 3/0224: {using polarising or depolarising elements} - G01J 3/4406: {Fluorescence spectrometry} - G01J 3/443: Emission spectrometry - G01N 21/718: {Laser microanalysis, i.e. with formation of sample plasma} - 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) - 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) ## Abstract A spectrum detecting device including a laser apparatus, an optical splitting apparatus, an optical gate, a first polarizer, a second polarizer, and an optical analysis apparatus is provided. The optical splitting apparatus splits the laser beam providing from the laser apparatus into a first and a second light beam, and the second light beam is transmitted to a sample to produce a spectral signal. The optical gate activated by the first light beam is disposed between the optical analysis apparatus and the sample. The first polarizer is disposed between the sample and the optical gate, and the second polarizer is disposed between the optical gate and the optical analysis apparatus. The spectral signal passes through the first polarizer, the optical gate, and the second polarizer to be transmitted and received to the optical analysis apparatus when the optical gate is activated and turned on in a predetermined time period. ## Claims ### Claim 1 A spectrum detecting device, comprising: a laser apparatus for providing a laser beam; an optical splitting apparatus for splitting the laser beam into a first light beam and a second light beam, wherein the second light beam is transmitted to a sample to produce a spectral signal; an optical analysis apparatus for receiving the spectral signal; an optical gate disposed between the optical analysis apparatus and the sample, wherein the first light beam is for activating the optical gate; a first polarizer disposed between the sample and the optical gate; and a second polarizer disposed between the optical gate and the optical analysis apparatus, wherein the spectral signal passes through the first polarizer, the optical gate, and the second polarizer to be transmitted to the optical analysis apparatus when the optical gate is activated and turned on in a predetermined time period. ### Claim 2 (depends on 1) The spectrum detecting device according to claim 1, further comprising: an optical path adjusting apparatus disposed between the optical splitting apparatus and the optical gate for adjusting a transmitting distance of the first light beam from the optical splitting apparatus to the optical gate. ### Claim 3 (depends on 2) The spectrum detecting device according to claim 2, wherein the optical path adjusting apparatus comprises a plurality of reflecting surfaces, and the distance between each of the reflecting surfaces is adjustable. ### Claim 4 (depends on 1) The spectrum detecting device according to claim 1, wherein the optical gate is a Kerr gate. ### Claim 5 (depends on 1) The spectrum detecting device according to claim 1, wherein the first polarizer and the second polarizer are linear polarizers, and the difference in polarization angles between the first polarizer and the second polarizer is 90 degrees. ### Claim 6 (depends on 1) The spectrum detecting device according to claim 1, further comprising: a first lens disposed on a path for the second light beam to travel from the optical splitting apparatus to the sample, and the second light beam is focused on the surface of the sample by the first lens. ### Claim 7 (depends on 1) The spectrum detecting device according to claim 1, further comprising: a second lens disposed between the sample and the optical analysis apparatus for collecting the spectral signal. ### Claim 8 (depends on 1) The spectrum detecting device according to claim 1, further comprising: a filter disposed between the optical analysis apparatus and the sample for filtering signals except the spectral signal. ### Claim 9 (depends on 1) The spectrum detecting device according to claim 1, wherein the laser beam is a pulse laser, and the pulse laser has a pulse width substantially from 1 femtosecond to 1 nanosecond. ### Claim 10 (depends on 1) The spectrum detecting device according to claim 1, wherein a time difference between the time point when the optical gate is turned on and the time point when the spectral signal is produced is substantially between 0 and 1 microsecond, and the predetermined time period is substantially between 1 picosecond and 1 nanosecond. ### Claim 11 A spectrum detecting method, comprising: splitting a laser beam into a first light beam and a second light beam with an optical splitting apparatus; transmitting the second light beam to a sample to produce a spectral signal; activating an optical gate by the first light beam to turn on the optical gate in a predetermined time period; and receiving the spectral signal with an optical analysis apparatus, wherein the optical gate is disposed between the optical analysis apparatus and the sample, and the spectral signal passes through a first polarizer, the optical gate, and a second polarizer in regular turn to be transmitted to the optical analysis apparatus when the optical gate is activated and turned on in the predetermined time period. ### Claim 12 (depends on 11) The spectrum detecting method according to claim 11, further comprising: adjusting a transmitting distance of the first light beam from the optical splitting apparatus to the optical gate with an optical path adjusting apparatus. ### Claim 13 (depends on 12) The spectrum detecting method according to claim 12, wherein the optical path adjusting apparatus comprises a plurality of reflecting surfaces, and the step of adjusting the transmitting distance of the first light beam from the optical splitting apparatus to the optical gate with the optical path adjusting apparatus comprises: adjusting the distance between each of the reflecting surfaces. ### Claim 14 (depends on 12) The spectrum detecting method according to claim 12, wherein the laser beam comprises a plurality of continuous laser pulses, the first light beam comprises a plurality of continuous first light beam pulses, and the second light beam comprises a plurality of continuous second light beam pulses. ### Claim 15 (depends on 14) The spectrum detecting method according to claim 14, wherein the step of adjusting the transmitting distance of the first light beam from the optical splitting apparatus to the optical gate with the optical path adjusting apparatus and the step of receiving the spectral signal with the optical analysis apparatus are carried out simultaneously, such that the transmitting distance of each of the first light beam pulses from the optical splitting apparatus to the optical gate is different from other transmitting distances of the first light beam pulses from the optical splitting apparatus to the optical gate. ### Claim 16 (depends on 14) The spectrum detecting method according to claim 14, wherein the spectral signal comprises a plurality of continuous spectral signal pulses, the step of adjusting the transmitting distance of the first light beam from the optical splitting apparatus to the optical gate with the optical path adjusting apparatus and the step of receiving the spectral signal with the optical analysis apparatus are carried out simultaneously, the predetermined time period comprises a plurality of continuous sub-predetermined time periods, the sub-predetermined time periods are different from one another, each of the spectral signal pulses passes through the optical gate in each of the corresponding sub-predetermined time periods, and the spectral signal pulses are received by the optical analysis apparatus in the sub-predetermined time periods. ### Claim 17 (depends on 11) The spectrum detecting method according to claim 11, further comprising: focusing the second light beam on the surface of the sample by a first lens; collecting the spectral signal with a second lens; and adjusting a relative position of the first lens and the second lens. ### Claim 18 (depends on 11) The spectrum detecting method according to claim 11, further comprising: filtering signals except the spectral signal with a filter, and the filter is disposed between the optical analysis apparatus and the sample. ### Claim 19 A spectrum detecting method, comprising: transmitting a laser beam to a sample to produce a spectral signal; and receiving the spectral signal with a photoelectric sensing device, wherein the photoelectric sensing device has a time-resolved ability, the spectral signal comprises a plurality of continuous spectral signal pulses, each of the spectral signal pulses passes through the photoelectric sensing device in one of a plurality of continuous sub-predetermined time periods, the sub-predetermined time periods are different from one another, and the spectral signal pulses are received by the photoelectric sensing device in the sub-predetermined time periods.