CN1313819C

CN1313819C - Laser light-emitting sensor

Info

Publication number: CN1313819C
Application number: CNB02134549XA
Authority: CN
Inventors: 马军; 李转发; 何德毅
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-08-07
Filing date: 2002-08-07
Publication date: 2007-05-02
Anticipated expiration: 2022-08-07
Also published as: CN1405551A

Abstract

The present invention relates to a laser-induced light-emitting sensor which orderly comprises one laser light source, one light beam shaping system, one light-filtering system, one detector, one signal processing and outputting device at least, wherein the emitted excitation light modulated by the laser light source is irradiated on photosensitive material to be detected by the light beam shaping system; then the excitation light and the photosensitive material are excited the emitted laser-induced light; the excitation light is isolated and inhibited by one light-filtering system, and the laser-induced light is transmitted; then laser-induced light signals are output after laser-induced light signals are received by the detector and processed by the signal processing and outputting device. Elements of a false identification sensor, etc. by applying the method can be widely applied to the automatic identification of trade mark tickets, non-trade mark tickets and automatic money checkers.

Description

Laser light-emitting sensor

Technical field

The present invention relates to the detection field of photoelectric technology of all kinds of laser radiations to the faint optical signal of the embedded photoluminescent material generation that can respond this laser.

Background technology

Development along with laser technology, to can inspire the photochromics spraying of photoluminescence at present to the laser of certain wavelength or be printed on a certain position mark of trade mark, non-trade mark scope and mobile object, to distinguish true from false or to have begun to use as the technology of object space reference point.But automatic identification, detection means to this technology relatively lag behind, and whether existing only have the static state identification to this mark, the Laser Devices that detect, and can only have the photoluminescence bright spot to discern the false from the genuine or the shift position by eye-observation.According to the knowledge of the applicant, also do not have both at home and abroad to find to distinguish the lasing light emitter (light source that is used for the exciting light photoluminescence, be strong background noise) and photoluminescence feeble signal (light signal to be measured), light laser fully can be suppressed again, detect the feeble signal of photoluminescence efficiently and accurately and replace human eye that observed photoluminescence signal is exported electric signal through opto-electronic conversion, with the sensing technology of machine means identification.

Technical scheme

The object of the present invention is to provide and a kind ofly can discern the sensor of all kinds of laser radiations automatically in photoluminescence that corresponding photochromics sends.Above-mentioned purpose can be achieved through the following technical solutions: a kind of laser light-emitting sensor, and it comprises 1 LASER Light Source (exciting pumping source) at least in regular turn, 1 beam shaping system, 1 filter system; 1 detector; 1 Signal Processing and output unit, wherein,

This LASER Light Source is used to produce laser, comes drive laser by one through the modulation signal driving circuit, can (mark of the printing of the laser photochromics of wavelength coverage 140nm～10.6um), spraying sends the laser of respective wavelength at the response different wave length;

This beam shaping system can be modulated to corresponding light beam with the beam shaping that laser instrument sent by actual requirement, as parallel or etc. the poly-or light beam dispersed;

This filter system can be made up of following manner: one group of optical filter adds a grating, or a dichroic mirror adds one group of optical filter, or a dichroic mirror adds one group of optical filter, adds a grating again.This filter set and dichroic mirror are used for isolating effectively and suppressing exciting light and the photic light that is excited is shone in transmission by the photochromics Stimulated Light; This grating pair mixed light signal carries out beam split, and the photoluminescence and the background laser of different wave length is reflected to different directions respectively.

This detector is used to receive the photic light of being come by the filter system transmission, and is converted to electric signal;

This Signal Processing and output unit are formed by presetting amplifying circuit, shaping circuit, comparator circuit in regular turn.

After adopting the present invention, can isolate and suppress exciting light (background noise) effectively, transmission also detects photic light, realizes photoluminescence feeble signal the discerning automatically and effectively by machine to laser excited.The devices such as false distinguishing sensor of using this method can be widely used in the automatic identification of trade mark, non-trade mark ticket and automatic cash inspecting machine.

Description of drawings

Fig. 1 is a theory diagram of the present invention, wherein represents exciting light with the arrow of solid line, and the arrow of band dotted line is represented photic light;

Fig. 2 is concrete light path of the present invention and circuit diagram, and wherein a, b, c are respectively three kinds of different implementations of light path;

Fig. 3 is three kinds of different optical filterings or a beam split synoptic diagram in the described theory diagram of Fig. 1.

Embodiment

Embodiment one: shown in the described laser light-emitting sensor of one embodiment of the present of invention, its light path a part in as shown, this sensor comprises 1 LASER Light Source 1, and its wavelength X is 980nm ± 20nm; 3 condenser lenses 2; 1 dichroic mirror 3; 1 optically filtering system 4 that forms by filter plate; 1 photodetector 6; Reach the signal Processing and the output circuit 9 that join with photodetector.

Impinge upon with respect on the laser sensitive photochromics 7 of wavelength X only through the 980nm laser of 1 condenser lens 2 shaping, be that laser is after penetrating from light source 1, behind this condenser lens 2, form parallel beam, then with α angle [(1 ° of α ∈, 179 °)] the oblique dichroic mirror 3 that is mapped to, the most of reflection of the laser of 3 pairs of incidents of dichroic mirror.This reflected light focuses on the tested material 7 through other 1 condenser lens, and photochromics 7 is shone by laser, i.e. flashlight is sent in response; If belong to false material or do not have photosensitive anti-fake material can not respond laser, be i.e. no signal light.

This flashlight that is being mingled with laser background noise signal focuses on and after dichroic mirror 3 transmissions through above-mentioned 1 condenser lens 2 in addition once more, through dichroic mirror filtering, laser is isolated and suppressed to the pass cooperation usefulness of line focus lens 2, dichroic mirror 3, optical filter 4 generally generally, transmission feeble signal light.

6 pairs of feeble signal light of being come by optical filter 4 transmissions of detector produce reaction, and light signal is converted to electric signal.Its electric signal of gathering improves signal to noise ratio (S/N ratio) through presetting amplifying circuit, after shaping circuit carries out shaping to the amplifying signal pulse, by amplifying circuit relatively signal and noise are compared again, obtain required electric impulse signal output, foregoing circuit all can adopt existing technology.

Embodiment two: shown in the b part of its light path in as shown, this sensor comprises 1 LASER Light Source 1, and its wavelength is 808nm ± 20nm; 3 condenser lenses 2; 1 dichroic mirror 3; 1 optically filtering system 4 that forms by filter plate; 1 grating 5; 1 photodetector 6; Reach the signal Processing and the output circuit 9 that join with photodetector.

The main difference part of itself and embodiment one is to increase by 1 grating 5 in the light path behind filter plate 4, and the light after the transmission filter mating plate 4 is penetrated on grating 5, carries out beam split, and photic light reflects to different directions because wavelength is different with laser.Photic anaclasis is on detector 6.

Embodiment three: shown in the c part of its light path in as shown, this sensor comprises 1 LASER Light Source 1, and its wavelength is 780nm ± 20nm; 2 condenser lenses 2; 1 optically filtering system 4 that forms by filter plate; 1 grating 5; 1 photodetector 6; Reach the signal Processing and the output circuit 9 that join with photodetector.

Laser is penetrated on photochromics 7 after 1 condenser lens 2 shaping after penetrating light source 1, and its reflected light is after other 1 condenser lens head 2 focuses on, and through filter plate 4 filtering, then through grating 5 beam split, needed photic light is detected device 6 and receives in the reflected light.

Claims

1, a kind of laser light-emitting sensor is characterized in that: it comprises 1 LASER Light Source at least in regular turn, 1 beam shaping system, 1 filter system; 1 detector; 1 Signal Processing and output unit, wherein, described LASER Light Source is used to produce laser, is driven through the modulation signal driving circuit by one, can send corresponding laser at the mark of the printing of response different wave length laser photochromics, spraying; Described beam shaping system can be modulated to corresponding light beam with the beam shaping that this laser instrument sent by actual requirement; Described filter system is used for isolating and suppressing laser signal, the photic light that transmission is excited by the irradiation of photochromics Stimulated Light, and it is made up of 1 dichroic mirror and 1 filter set in regular turn; Described detector is used to receive the photic light of being come by this filter system transmission, and is converted to electric signal; Described Signal Processing and output unit are formed by presetting amplifying circuit, shaping circuit, comparator circuit in regular turn.

2, laser light-emitting sensor as claimed in claim 1 is characterized in that: after the dichroic mirror and filter set of described filter system, also be provided with a grating.