CN2211598Y

CN2211598Y - Photometer

Info

Publication number: CN2211598Y
Application number: CN 95204453
Authority: CN
Inventors: 赵子春
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-03-09
Filing date: 1995-03-09
Publication date: 1995-11-01
Anticipated expiration: 2005-03-09

Abstract

The utility model relates to a photometer for measuring and indicating the illumination, which is different from the bygone complicated photometer. The utility model uses a photoresistor as a photoelectric sensor, uses a dual comparator as a logic circuit, and uses three light emitting diodes as indicator lamps. When a green lamp lights, the range of the illumination is what people need. When the illumination is above the range, the indication of a red lamp lights. When the illumination is below the range, the indication of a yellow lamp lights. Thereby, the visible light is divided into three ranges. The utility model has a simple circuit. The cost is very low. The utility model can be expediently used for the monitoring of the illumination of the living, learning and working environment and the indication of illumination of the light modulating desk lamp or other electronic products.

Description

Photometer

The utility model relates to the electronic metering field, the device of particularly a kind of measurement and pilot light illumination.

At present, known illuminometer all is used for industrial use.Generally make sensor, adopt full-enclosed structure, digital circuit output by blue silicon probe.As a kind of surveying instrument, it costs an arm and a leg, nearly 1,000 yuan, and application is little.

The purpose of this utility model just provides the device of a kind of simple measurement and pilot light illumination, thereby this device circuit can be advantageously used in all kinds of relevant electronic products, for example: the illuminance monitoring of all kinds of lives, work, academic environment, the illumination indication of lamp dimmer etc.

The purpose of this utility model comes to this and realizes, the device of a kind of measurement and pilot light illumination, it is characterized in that: form by the indicating circuit that photoelectric sensor, logical circuit, light emitting diode and triode constitute, the input end of the output termination logical circuit of photoelectric sensor wherein, the output termination indicating circuit of logical circuit.

---described photoelectric sensor is to be made of photoresistance (cds), and logical circuit is made of dual comparator LM393; Resistance R wherein ₁, light sensor cds and R ₃Be connected in series R ₁One termination power, R ₃One end ground connection, R ₃Meet the A of dual comparator LM393 with the contact of cds ₁Negative input end 2 and A ₂Positive input 5, resistance R ₂, R ₄, R ₅Be connected in series R ₂With R ₄Tie point meet A ₁Positive input 3, R ₄, R ₅Tie point meet A ₂ Reverse input end 6, A ₁, A ₂Output terminating diode D ₁, D ₂Negative terminal, D ₁, D ₂The base stage of positive termination triode (2SC2458), emitter connects the positive pole of green LED (G), its negative pole passes through R ₉Ground connection; Yellow light-emitting diode (Y) series connection R ₇After, its positive pole connects power supply, R ₇Another termination A ₂Output terminal; Red light emitting diodes (R) series connection R ₆After meet positive source and A respectively ₁Output terminal.

The utility model is described in further detail below in conjunction with drawings and Examples:

Accompanying drawing is the utility model circuit theory diagrams.

Referring to accompanying drawing, medical science and optics all prove: the illuminance of human eye perceives the most comfortable is the 130Lux(lux)～the 500Lux(lux).

When illumination surpasses 500Lux:

Cds is low resistance relatively: comparer A ₁Be input as high level, it is output as low level, and red light emitting diodes (R) is lighted.

When illumination is lower than 130Lux:

Cds is relative high value: comparer input low level, A ₂Be output as low level, yellow light-emitting diode (Y) is lighted.

When illumination is between 130Lux～500Lux, the corresponding resistance of reasonable disposition, triode 2SC2458 conducting, green LED (G) is lighted.

Thereby provided a suitable illumination range, reached the purpose of monitoring of environmental light.

Claims

1, the device of a kind of measurement and pilot light illumination, it is characterized in that: form by the indicating circuit that photoelectric sensor, logical circuit, light emitting diode and triode constitute, the input end of the output termination logical circuit of photoelectric sensor wherein, the output termination indicating circuit of logical circuit.

2, the device of measurement according to claim 1 and pilot light illumination is characterized in that: photoelectric sensor is to be made of photoresistance (cds), and logical circuit is made of dual comparator LM393; Resistance R wherein ₁, light sensor cds and R ₃Be connected in series R ₁One termination power, R ₃One end ground connection, R ₃Meet the A of dual comparator LM393 with the contact of cds ₁Negative input end 2 and A ₂Positive input 5, resistance R ₂, R ₄, R ₅Be connected in series R ₂With R ₄Tie point meet A ₁Positive input 3, R ₄, R ₅Tie point meet A ₂Reverse input end 6, A ₁, A ₂Output terminating diode D ₁, D ₂Negative terminal, D ₁, D ₂The base stage of positive termination triode (2SC2458), emitter connects the positive pole of green LED (G), its negative pole passes through R ₉Ground connection; Yellow light-emitting diode (Y) series connection R ₇After, its positive pole connects power supply, R ₇Another termination A ₂Output terminal; Red light emitting diodes (R) series connection R ₆After, meet positive source and A respectively ₁Output terminal.