Global Patent Index - EP 1047930 A1

EP 1047930 A1 2000-11-02 - LIQUID CRYSTAL SENSORS

Title (en)

LIQUID CRYSTAL SENSORS

Title (de)

FLÜSSIGKRISTALLSENSOREN

Title (fr)

CAPTEURS A CRISTAUX LIQUIDES

Publication

EP 1047930 A1 (EN)

Application

EP 98962568 A

Priority

  • GB 9803841 W
  • GB 9726923 A

Abstract (en)

[origin: GB2332511A] A device for sensing one or more analyte molecules comprises a membrane (1) whose surfaces are rendered electrically conducting; a liquid crystal material or liquid crystal blend impregnated within the membrane; a light source; a light sensor; and light guides (8) between the light source and one surface of the membrane (1) and between the other surface and the light sensor, whereby the light sensor senses light transmitted through the membrane (1) from the source via the light guides (8). The light transmitted through the liquid crystal is affected by the presence of particular molecules in a liquid or gas passed through holes (7) into a space adjacent the membrane. Different sinusoidally modulated voltages applied across the two surfaces of the membrane change the response of the liquid crystal and render the device sensitive to different molecules. Further optical fibres (9) form a reference channel where the liquid crystal is not exposed to the analyte.

IPC 1-7 (main, further and additional classification)

G01N 21/77; G01N 21/59

IPC 8 full level (invention and additional information)

G01N 21/59 (2006.01); G01N 21/77 (2006.01)

CPC (invention and additional information)

G01N 21/77 (2013.01); G01N 21/59 (2013.01); G01N 2021/7783 (2013.01)

Citation (search report)

See references of WO 9932878A1

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

GB 2332511 A 19990623; GB 9726923 D0 19980218; AU 1770399 A 19990712; CA 2314366 A1 19990701; EP 1047930 A1 20001102; WO 9932878 A1 19990701

INPADOC legal status


2004-01-14 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20030701

2000-11-02 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000620

2000-11-02 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB IT