CN103411884B - A kind of reference transmission dispersion sensitivity spectrum line detector - Google Patents

Abstract

The invention relates to a reference transmission dispersion-sensitive spectral line detection device, which can effectively solve the problems of high processing and assembly precision requirements, high cost, large volume, long measurement time and poor anti-interference ability of the tester. The technical solution is: , including a box, a linear array CCD sensor module and a linear photodiode, a shading cover is installed on the upper part of the box, a transparent vessel is installed in the middle of the box, and a light-emitting diode is installed on the left side of the transparent vessel. Connected, a diaphragm is installed on the right side of the transparent vessel, a dispersion grating is installed on the right side of the diaphragm, a linear array CCD sensor module is installed above the dispersion grating, the light-emitting diode is connected to the driving circuit, and the linear photodiode is connected to the second processor. The linear array CCD sensing module is connected with the first processor. The invention has ingenious structure, simple manufacturing process and convenient use, and can effectively solve the tester processing and assembly precision requirements, high cost, large volume, long measurement time, and anti-interference ability. bad question.

Description

A Reference Transmission Dispersion Sensitive Spectral Line Detection Device

1. Technical field

The invention relates to the field of liquid spectrum measurement, in particular to a reference transmission dispersion sensitive spectral line detection device.

2. Background technology

At present, in some liquid residual substance detection methods, liquid phase spectrophotometers are used. Due to the rotational movement or linear movement of the spectroscopic device during the measurement process to achieve dispersion scanning, the processing and assembly accuracy of the tester is demanding. The requirements for measuring environmental vibration, horizontal stability, temperature and humidity are very high. Usually, the equipment is expensive, bulky, long measurement time, poor anti-interference ability, and can only work under laboratory conditions. Although some testers based on color-sensitive sensors have also appeared, which have improved the defect that the dispersion device needs to be rotated and scanned during the measurement process of the spectrophotometer, but the luminous intensity of the light source is unstable due to unstable power supply, temperature change, and luminous efficiency attenuation. , leading to low measurement accuracy and poor consistency, the problems have not been well resolved, especially for the measurement that requires spectral line distribution, there is nothing we can do. Therefore, it is particularly important to provide emergency quick test methods and devices that can well meet the requirements of various complex field tests, especially for some emergencies or natural disasters.

3. Contents of the invention

In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a reference transmission dispersion sensitive spectral line detection device, which can effectively solve the tester processing and assembly precision requirements, high cost, large volume, and measurement time. Long, poor anti-interference ability.

The technical solution is to include a box body, a linear array CCD sensor module and a linear photodiode. It is connected with the light-emitting diode through the optical fiber. The right side of the transparent vessel is equipped with a diaphragm, and the right side of the diaphragm is equipped with a dispersion grating. A linear array CCD sensor module is installed above the dispersion grating. The center of the diaphragm and the light-emitting diode are on the same axis. The reflective surface of the grating corresponds to the right end face of the transparent vessel and forms an angle of 135 degrees with the horizontal axis of the diaphragm; the light-emitting diode is connected with the driving circuit, the linear photodiode is connected with the second processor, and the linear array CCD sensor module is connected with the second processor. The first processor is connected, the first processor and the second processor are respectively connected with the third processor, the third processor is connected with the fourth processor, and the fourth processor is connected with the display.

Said first processor, second processor, third processor and fourth processor are single-chip microcomputers.

The invention has ingenious structure, simple manufacturing process and convenient use, and can effectively solve the problems of high processing and assembly precision requirements, high cost, large volume, long measurement time and poor anti-interference ability of the tester.

4. Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a schematic diagram of the optical measurement principle of the present invention.

5. Specific implementation

The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Provided by Fig. 1 and Fig. 2, the device of the present invention comprises a box body, a linear array CCD sensor module and a linear photodiode, a light shield 3 is installed on the top of the box body 1, a transparent vessel 5 is housed in the middle of the box body 1, and the transparent vessel The left side of 5 is equipped with light-emitting diode 2, the linear photosensitive diode 4 is connected with light-emitting diode 2 through optical fiber 15, the right side of transparent vessel 5 is equipped with diaphragm 7, the right side of diaphragm 7 is equipped with dispersion grating 8, and the top of dispersion grating 8 is equipped with The linear array CCD sensor module 6, the center of the diaphragm 7 and the light emitting diode 2 are on the same axis, the reflective surface of the dispersion grating 8 corresponds to the right end face of the transparent vessel 5 and forms an included angle of 135 degrees with the horizontal axis of the diaphragm 7; The light-emitting diode 2 is connected to the drive circuit 9, the linear photodiode 4 is connected to the second processor 10, the linear array CCD sensing module 6 is connected to the first processor 11, and the first processor 11 and the second processor 10 are respectively It is connected to the third processor 12 , the third processor 12 is connected to the fourth processor 13 , and the fourth processor 13 is connected to the display 14 .

Said first processor 11, second processor 10, third processor 12 and fourth processor 13 are single-chip microcomputers.

The usage situation of the present invention is:

The light-emitting diode 2 emits light, and the liquid in the transparent vessel 5 and the optical fiber 15 receive the light at the same time. The light passing through the liquid in the transparent vessel 5 is irradiated on the dispersion grating 8 through the diaphragm 7, and then shines on the dispersion grating 8 after being reflected by the dispersion grating 8. The linear array CCD sensing module 6, the linear array CCD sensing module 6 transmits the signal to the first processor 11, and the V _i obtained after processing is transmitted to the third processor 12; the light received by the optical fiber 15 is sent to the linear The photosensitive diode 4 is converted into a signal and transmitted to the second processor 10. After processing, the measured luminous intensity E ₂ is obtained and transmitted to the third processor 12. The third processor 12 corrects the measured luminous intensity E ₂ coefficient, and then correct the actual measured value of each pixel V _i of the linear CCD sensor module 6 , and the corrected linearization by the fourth processor 13 is displayed on the display screen 14 .

Calculated as follows:

${\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\frac{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; \&Right\; Arrow;</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&Right\; Arrow;</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\frac{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}{\mathrm{<span\; class="notranslate">\; V</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}$

For a linear array CCD with N pixels, i=1～N in the above formula, where

S _i - the gray scale value of the i-th pixel of the measured liquid, which is the detection result;

K _i - the chromatographic absorption coefficient of the i-th pixel of the measured liquid, which is a known value;

V _i - the output gray value of the i-th pixel of the CCD sensor, which is the measured value;

E ₁ - the light intensity of the standard light source, which is a known value;

E ₂ - the measured light intensity of the light source, which is the measured value;

I ₁ -when corresponding to the light intensity of the standard light source, the photocurrent of the linear photodiode 4 is a known value;

I ₂ -the photocurrent of the linear photodiode 4 corresponding to the measured light intensity of the light source, which is the measured value.

Because the present invention uses a dispersion grating plus a linear array CCD sensing module to replace the traditional scanning dispersion structure, the entire measurement process does not require mechanical rotation and scanning, thus greatly improving the environmental applicability and measurement stability of the instrument. At the same time, due to the two spectral The measurement structure and method are different. The former is much faster than the latter in terms of signal acquisition and data processing speed, and the ordinary single chromaticity measurement time is less than 2 seconds.

The invention has ingenious structure, simple manufacturing process and convenient use, and can effectively solve the problems of high processing and assembly precision requirements, high cost, large volume, long measurement time and poor anti-interference ability of the tester.

Claims (2)

1. a reference transmission dispersion sensitivity spectrum line detector, comprise casing, line array CCD sensing module and linear photosensor diode, light shield (3) is equipped with on casing (1) top, transparent utensil (5) is housed in the middle of in casing (1), transparent utensil (5) left is equipped with light emitting diode (2), linear photosensor diode (4) is connected with light emitting diode (2) through optical fiber (15), the right-hand diaphragm (7) that is equipped with of transparent utensil (5), the right-hand dispersion grating (8) that is equipped with of diaphragm (7), line array CCD sensing module (6) is equipped with in dispersion grating (8) top, the center of diaphragm (7) and light emitting diode (2) is on same axis, the right side of dispersion grating (8) reflective surface and transparent utensil (5) is corresponding and become 135 degree angles with the horizontal axis of diaphragm (7), light emitting diode (2) is connected with drive circuit (9), linear photosensor diode (4) is connected with the second processor (10), line array CCD sensing module (6) is connected with first processor (11), first processor (11) is connected with the 3rd processor (12) respectively with the second processor (10), the 3rd processor (12) is connected with four-processor (13), and four-processor (13) is connected with display (14).

2. reference transmission dispersion sensitivity spectrum line detector according to claim 1, it is characterized in that, said first processor (11), the second processor (10), the 3rd processor (12) and four-processor (13) are single-chip microcomputer.