CN2035478U

CN2035478U - Photoelectric sensor for concentration

Info

Publication number: CN2035478U
Application number: CN 88218979
Authority: CN
Inventors: 王祖文
Original assignee: Institute of Optics and Electronics of CAS
Current assignee: Institute of Optics and Electronics of CAS; Academy of Opto Electronics of CAS
Priority date: 1988-10-26
Filing date: 1988-10-26
Publication date: 1989-04-05

Abstract

The utility model discloses a photoelectric sensor for concentration, relating to the measuring technique of solution concentration; the utility model mainly comprises a semiconductor light emitting device, a condenser, a fiducial reflecting mirror and a light sensitive detector, and is entirely sealed; the solution concentration can be converted to electrical signal for output, and the existing Abbe concentration sensor can be replaced. The utility model has the advantages of small size, light weight, simple manufacture technology, low cost, high precision, wide purpose, convenient operation, high effectiveness and reducing labour intensity, and is great change for the existing concentration sensor; the photoelectric sensor for concentration can be widely used for the industry such as sugar-producing, food product, agriculture research, medicine, etc., and can also be used for the measurement and control of the liquid in the petrochemical industry.

Description

Photoelectric sensor for concentration

The utility model relates to the measuring technique of solution concentration.

Existing Abbe formula concentration sensor is that a refractive power face with refractive prism contacts with detected solution, utilize the solution of variable concentrations to have different refractive indexes, under the certain condition of the refractive index of refractive prism, the size of critical angle only depends on these characteristics of concentration of detected solution, when light incides detected solution and the formed interface of refractive prism, the refraction angle enters refractive prism less than the light of critical angle, the refract light of process refractive prism is again by focusing on behind the telescopic system on the graticule that has scale, and forming a bright-dark cut, the pairing scale of its line just can reflect the concentration of detected solution.This concentration sensor exists following shortcoming:

1. when measuring, must or become clear and locate the detected solution alignment light source, it be not too convenient to use.

2. the concentration of solution is to reflect by the position of bright-dark cut in the graticule of visual field, thus must connect together with observing part, and can only observe with human eye.Because aberration exists, bright-dark cut and fuzzy have increased testing staff's labour intensity greatly, have also limited measuring accuracy and usable range simultaneously.

The utility model aims to provide a kind of new photoelectricity concentration sensor that is enough to overcome above-mentioned shortcoming.

The theory structure of this photoelectricity concentration sensor as shown in Figure 1.It is mainly formed by light emitting semiconductor device 1, condenser 2, benchmark catoptron 3, light-sensitive detector 4 integral sealings.And permissible accuracy difference during owing to use, condenser 2 can be by the different structures of forming with respect to benchmark catoptron 3.As Fig. 1 (A): condenser 2 and benchmark catoptron 3 adopt the form of isolating constructions; As Fig. 1 (B): condenser 2 can adopt compact more semiglobe 6 with the composition of benchmark catoptron 3.Detected solution 5 is positioned on the benchmark catoptron 3, and there is an interface to form, when incident light during through the interface, part reflected light is received by light-sensitive detector 4, the magnitude of voltage that obtains on the pull-up resistor on the light-sensitive detector 4 just can reflect the concentration of detected solution, being the photoelectricity concentration sensor is converted to electric signal output with the concentration of solution, can observe the concentration of detected solution very intuitively through signal processing circuit.Adopt the method that changes incident angle of light and change pull-up resistor, can improve measuring accuracy, further reduce the nonlinearity erron of measuring.This photoelectricity concentration sensor is applicable to as industries such as sugaring, food, agri-scientific research, medical science and oil, chemical industry measurement and the control to liquid.

Advantage and good effect that the utility model had are as follows:

1. the electric signal of the reflection detected solution concentration of photoelectricity concentration sensor output, through signal processing circuit, can observe detected solution concentration intuitively, thereby alleviated testing staff's labour intensity greatly, productivity effect and measuring accuracy (as the measurement to sucrose solution concentration, the measuring accuracy of sensor is higher than 1/1000) have been improved.

2. photoelectricity concentration sensor integral sealing, volume is very little, and is in light weight, and cost is low, and purposes is very extensive, uses observation convenient.During measurement, detected solution can be placed on the benchmark catoptron of photoelectricity concentration sensor, also the photoelectricity concentration sensor can be placed detected solution.Especially select the photoelectricity concentration sensor of anti-corrosion material sealing for use, also very convenient to measuring corrosive liquids such as acid, alkali.

Description of drawings: Fig. 1, photoelectricity concentration sensor theory structure synoptic diagram;

Fig. 2, photoelectricity concentration sensor most preferred embodiment structural representation.

The utility model most preferred embodiment:

As shown in Figure 2, condenser 2 is glued on the benchmark catoptron 3, and this part is sealed into an integral body with light emitting semiconductor device 1 and light-sensitive detector 4, and three core I/O cables are arranged.Place detected solution 5 on the benchmark catoptron 3 of photoelectricity concentration sensor.The light that light emitting semiconductor device 1 sends enters benchmark catoptron 3 through condenser 2, and on the oblique interface that is mapped to benchmark catoptron 3 and detected solution 5, so light is by folding, reflection law, part light is refracted, part light is reflected, reflected light through behind condenser 2 optically focused, converges on the light-sensitive detector 4 again, and the magnitude of voltage that obtains on the tunable load resistance of light-sensitive detector 4 just can reflect the concentration of detected solution.If behind this electric signal input signal treatment circuit, then can observe the concentration of detected solution intuitively.

Claims

1, photoelectricity concentration sensor is characterized in that being formed by light emitting semiconductor device 1, condenser 2, benchmark catoptron 3 and light-sensitive detector 4 integral sealings.Condenser 2 can be by the different structures of forming with benchmark catoptron 3.

2, photoelectricity concentration sensor as claimed in claim 1, it is characterized in that the condenser 2 and the composition structure of benchmark catoptron 3 can be separate types, or be glued at the structure of forming on the benchmark catoptron 3 or a semiglobe 6 that directly processes by condenser 2.