Title:
METHOD OF REDUCING FALSE-POSITIVE PARTICLE COUNTS OF AN INTERFERENCE PARTICLE SENSOR MODULE
Document Type and Number:
WIPO Patent Application WO/2020/002616
Kind Code:
A8
Abstract:
The invention relates to a method of reducing false-positive particle counts detected by an interference particle sensor module, preferably a self-mixing interference particle sensor module, wherein the interference particle sensor module comprises a laser (100) and a light detector (200), the method comprises the steps of: emitting laser light (315) by means of the laser (100), providing a high-frequency signal to the interference particle sensor module during the emission of the laser light (315), wherein a modulation frequency of the high-frequency signal is chosen in the range between 10 MHz and 500 MHz, detecting an optical response by means of the light detector (200) when providing the high-frequency signal in reaction to the emitted laser light (315), wherein the high-frequency signal is arranged such that a detection signal caused by a macroscopic object (25) positioned in a range between a first distance and a second distance of the particle sensor module is reduced in comparison to a detection signal caused by the macroscopic object (25) at the same position without providing the high-frequency signal, wherein the high-frequency signal is provided to a tuning structure of the particle sensor module which is arranged to modify a resonance frequency of an optical resonator comprised by the laser sensor module upon reception of the high-frequency signal. The invention further relates to a corresponding laser sensor (300), a particle detector comprising such a laser sensor (300), a mobile communication device comprising such a laser sensor (300) or particle detector and a computer program product.
Inventors:
SPRUIT HANS (DE)
VAN DER LEE ALEXANDER (DE)
GERLACH PHILIPP HENNING (DE)
WOLF ROBERT (DE)
WEISS ROBERT (DE)
FALK MATTHIAS (DE)
VAN DER LEE ALEXANDER (DE)
GERLACH PHILIPP HENNING (DE)
WOLF ROBERT (DE)
WEISS ROBERT (DE)
FALK MATTHIAS (DE)
Application Number:
PCT/EP2019/067358
Publication Date:
February 25, 2021
Filing Date:
June 28, 2019
Export Citation:
Assignee:
BOSCH GMBH ROBERT (DE)
TRUMPF PHOTONIC COMPONENTS GMBH (DE)
TRUMPF PHOTONIC COMPONENTS GMBH (DE)
International Classes:
G01N15/14; G01B9/02; G01N15/02; G01N15/06; G01S7/48; G01S17/32; G01S17/58; G01S17/88; H01S5/06; H01S5/183
Attorney, Agent or Firm:
WITTE, WELLER & PARTNERPATENTANWÄLTE MBB (DE)
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