CN2624305Y

CN2624305Y - Laser smoke sensing detector

Info

Publication number: CN2624305Y
Application number: CN 03243562
Authority: CN
Inventors: 陈海明
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-03-28
Filing date: 2003-03-28
Publication date: 2004-07-07
Anticipated expiration: 2013-03-28

Abstract

The utility model relates to a fire alarm detector, in particular relates to a laser smoke-sensitive detector. The laser smoke-sensitive detector comprises a diode drive circuit, a receiving circuit, a filter amplifying circuit, a judgment and processing circuit, a decoding output circuit, filter voltage regulating circuit, and pulse synchronous signals, and is characterized in that: the diode drive circuit is a laser diode drive circuit, which can be still designed as below: a capacitor is connected with a constant current source formed by two triodes in series after being connected with the laser diode in parallel,; a circuit of another capacitor connected with the circuit is connected to a resistor in serial. Due to the laser diode is specified as the light source, the laser smoke-sensitive detector has the advantages of strong light source, high energy, excellent monochromatic and directivity, and long service life; moreover, due to strong scatter of laser to smoke and mist particles, the laser smoke-sensitive detector also has high sensibility, which can realize the fire early alarm; meanwhile, compared with the conventional photoelectric smoke-sensitive detector, the coverage area of the laser smoke-sensitive detector is also greatly enlarged.

Description

The laser smoke detector

Technical field

The utility model relates to a kind of detector for fire alarm system, particularly relates to a kind of laser smoke detector.

Background technology

In the fire alarm field, what mainly use is optical detector of fire smoke at present.This detector mainly uses the LED light emitting diode as light source and since LED luminous a little less than, energy is little, excites the scattered light of smoke particle little, thereby not high to the susceptibility of smog, it is not high to show detector sensitivity, fails to report easily; And traditional optical detector of fire smoke requires high to sense cigarette darkroom, the smog labyrinth is unfavorable for that smog spreads in the darkroom, thereby the protection area is little.

Summary of the invention

The purpose of this utility model is in order to solve above-mentioned existing problem, and provides a kind of luminous strong, and energy is big, monochromaticity, good directionality, long service life, highly sensitive new pattern laser smoke detector.

The utility model is achieved through the following technical solutions for achieving the above object.This laser smoke detector includes diode drive circuit, receiving circuit, filter amplification circuit, judgment processing circuit, decoding output circuit, filter regulator circuit, pulse synchronous signal is characterized in that described diode drive circuit is a laser diode driver circuit.Because laser diode driver circuit adopts laser diode to do light source, the inspiration degree of this laser smoke detector is than the optical detector of fire smoke height.

Laser smoke detector provided by the utility model, its diode drive circuit can also be by following design: connect with the constant current source of being made up of triode V1 and V2 after capacitor C 2 and the laser diode L parallel connection again, capacitor C 1 and circuit after above-mentioned described circuit is in parallel are connected with resistance R 1 again.The constant current source of two triode compositions is controlled laser diode, can prolong the serviceable life of laser smoke detector so widely.

Laser smoke detector provided by the utility model, the receiving element of receiving circuit is a phototriode; The photosensitive surface of phototriode is coated with the laser interference filter coating, utilize the laser interference principle, increase the penetrability of 650nM light wave, filter other and disturb light wave, increase is to surveying the susceptibility of scattered light, therefore, sense smog labyrinth, cigarette darkroom is required to reduce greatly, can increase the diffusion of smog in sense cigarette darkroom; The protection area of detector can be by present 80M simultaneously ²Bring up to 120M ²More than.

Laser smoke detector provided by the utility model is owing to do light source with laser diode, has luminous by force, and energy is big, and monochromaticity is good, good directionality, the advantage of long service life; Because laser is also strong to the smoke particle scattered light, therefore the sensitivity of this laser smoke detector is also very high, can realize the super early warning to fire; The more traditional optical detector of fire smoke of the protection area of this laser smoke detector also increases widely simultaneously.

Description of drawings

Fig. 1 is the synoptic diagram of the laser smoke detector that provides of embodiment;

Fig. 2 is the structural representation of the laser diode driver circuit that provides of embodiment;

Fig. 3 is the structural representation of the receiving circuit that provides of embodiment.

The accompanying drawing identifier declaration

The 1-diode drive circuit, 2-receiving circuit, 3-filter amplification circuit, 4-judgment processing circuit, 5-decoding output circuit, 6-filter regulator circuit, 7-pulse synchronous signal, 8-system bus, 9-laser diode, 10-light activated element, 11-laser interference filter coating.

Embodiment

Come the utility model is further described below in conjunction with accompanying drawing.

Embodiment: the laser smoke detector that present embodiment provided, as shown in Figure 1, and by diode drive circuit 1, receiving circuit 2, filter amplification circuit 3, judgment processing circuit 4, decoding output circuit 5, filter regulator circuit 6, pulse synchronous signal 7, system bus 8 is linked in sequence; Wherein system bus voltages is 18--24V; Diode drive circuit 1 connects as shown in Figure 2, uses laser diode 9 as light source; Receiving circuit 2 connects as shown in Figure 3, uses phototriode 10 as receiving element, and is coated with laser interference filter coating 11 on the surface of phototriode.Wherein V1, V2 conduction period by capacitor C 1 power supply, ON time is gone up the rising edge decision of pulse by R4, V1, V2 turn-on cycle are determined by the time constant of R1, C1, electric current is by the resistance decision of R2, laser diode 9 working currents are about 50MA, the working current of entire circuit is determined by R1, about 0.2MA; Require the about 30MS of input pulse width W=U*C1*R1.L: laser diode 5mW650nM, V1:2N3704, V2:BD131, R1:1K Ω, C1:100UF, R2:20 Ω, R3:100K Ω, R4:100K Ω, C2:100pF, C3:100pF; V4: phototriode 3DU, V3: triode 3DG, R1:47K Ω, R2:1.2K Ω.As shown in Figure 2, when A point low level, V1, not conducting of V2; When A point high level-and V2 base stage high level, conducting-B point high level-V1 conducting-A point step-down level-V2 point shutoff-B point step-down level-V1 shutoff-A point uprises level, carries out work successively.Like this, during the V2 conducting, the L energising is bright; When V2 turn-offed, L turn-offed, and goes out; Thereby carrying out that the realization laser diode does not stop is glittering, the light that sends is through the smoke particle scattering, after filtering, the laser interference filter coating shines on the phototriode 10 of laser pick-off circuit 2, the band signal that produce this moment, after filter amplification circuit 3 is amplified, carry out analogy with the setup parameter window in the judgment processing circuit 4, the signal of generation changes alerting signal into by decoding output circuit 5, thereby realizes the effect of fire alarm.

Claims

1. laser smoke detector, include diode drive circuit (1), receiving circuit (2), filter amplification circuit (3), judgment processing circuit (4), decoding output circuit (5), filter regulator circuit (6), pulse synchronous signal (7) is characterized in that described diode drive circuit (1) is a laser diode driver circuit.

2. laser smoke detector according to claim 1, it is characterized in that described diode drive circuit 1 is by following design: connect with the constant current source of forming by triode V1 and V2 again after capacitor C 2 and laser diode (9) parallel connection, capacitor C 1 and circuit after above-mentioned described circuit is in parallel are connected with resistance R 1 again.

3. laser smoke detector according to claim 1 and 2, the receiving element that it is characterized in that described receiving circuit (2) are phototriode (10).

4. laser smoke detector according to claim 3 is characterized in that the surface of described phototriode (10) is coated with laser interference filter coating (11).