Test methods for relative dielectric constant and dielectric loss of optical glass materials

Abstract

The present invention provides a method for testing the relative dielectric constant and dielectric loss of an optical glass material. The method comprises the following steps: 1) preparing an optical glass material sample into a cylindrical rod-shaped material with uniform diameter; 2) performing cavity calibration and system calibration of a re-entrant coaxial cavity testing device; 3) placing the optical glass material sample to be tested in a test cavity in the re-entrant coaxial cavity testing device, entering a test process of relative dielectric constant and dielectric loss, and obtaining a relative dielectric constant ε 测 ˊ and dielectric loss ε 测 "; 4) for the relative dielectric constant ε 测 ˊ、Dielectric loss ε 测 "Correction is performed to obtain the relative dielectric constant εˊ and dielectric loss ε". The measurement error of the relative dielectric constant of the optical glass material tested by the present invention is less than 1.5%, and the measurement error of the dielectric loss is less than 20%, which can well reduce the measurement error of the optical glass material and make the measurement result better reflect the dielectric properties of the optical glass material.

Description

Technical Field

[0001] The invention belongs to the field of optical glass material testing, and in particular relates to a method for testing the relative dielectric constant and dielectric loss of optical glass materials. Background Art

[0002] The magnetoelectric phenomenon of optical glass is directly related to the structure of optical glass materials and the motion state of electrons and atoms in the glass, reflecting the quantum effect of the motion state of microscopic particles in the glass. Therefore, the test and research on the magnetoelectric properties of optical glass can obtain a lot of information about the material structure and the interaction between various microscopic particles in the optical glass material, and can provide a deeper understanding of the material nature of the optical glass material. Generally, it is hoped that optical glass materials have consistency. By measuring electrical and magnetic parameters, we can further understand the various factors affecting optical glass materials, analyze the changing relationship between the composition of optical glass materials and the influence of different group distribution ratios in the matrix on the corresponding properties, and test the electrical parameters of optical glass materials such as dielectric constant and dielectric loss. It can be used for application research, research and development evaluation of the performance of optical glass materials, and provide a basis for improving the performance of optical glass materials.

[0003] At present, there is no test specifically for electromagnetic performance parameters such as dielectric constant of optical glass materials. The research on testing technology and methods for electromagnetic performance parameters such as dielectric constant of optical glass materials is still in a blank stage. Research on testing technology and methods for optical glass dielectric constant, dielectric loss and other parameters can provide testing technology support for the development of optical glass, especially functional glass, electronic glass, microcrystalline glass and other optical glasses, and meet the needs of optical glass material property analysis. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for testing the relative dielectric constant and dielectric loss of an optical glass material.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a method for testing the relative dielectric constant and dielectric loss of optical glass materials, the method comprising the following steps:

[0006] 1) preparing an optical glass material sample into a cylindrical rod-shaped material with uniform diameter;

[0007] 2) Cavity calibration and system calibration of re-entrant coaxial cavity test equipment;

[0008] 3) Place the optical glass material sample to be tested in the test cavity of the re-entrant coaxial cavity test equipment, enter the test process of relative dielectric constant and dielectric loss, and obtain the relative dielectric constant ε 测 ˊ and dielectric loss ε 测 "data;

[0009] 4) The relative dielectric constant ε is calculated by the following formula: 测 ˊ、Dielectric loss ε 测 "Correction is performed to obtain the relative dielectric constant εˊ and dielectric loss ε":

[0010] ε=(kd)ε 测 (1)

[0011]

[0012] Furthermore, in step 1), two optical glass material samples are processed, and step 3) is repeated to test the relative dielectric constant and dielectric loss of the second optical glass material sample, and step 4) the relative dielectric constant ε 测 ˊ and dielectric loss ε 测 " are the average values ​​of relative dielectric constant and dielectric loss of two optical glass material samples.

[0013] Furthermore, the relative dielectric constants ε of the two optical glass material samples are 测 ˊ and dielectric loss ε 测 The test data of "difference is no more than 2%.

[0014] Furthermore, in step 1), both ends of the optical glass material sample are finely ground or polished, the roughness Ra of the sample surface is 0.4-1.6, the parallelism is 0-0.02, and the sample diameter d is The sample length L is greater than or equal to 30 mm. The surface of the optical glass material sample is cleaned with distilled water and dried.

[0015] Furthermore, the cavity calibration described in step 2) is: software initialization of the reentrant coaxial cavity test equipment; selecting the "Cavity Calibration" submenu under the "Test Operation" menu in the test software menu bar, that is, the "Cavity Measurement Confirmation" window pops up, click "Confirm", set the equipment cavity parameters, and click "Confirm" again to wait for the cavity calibration to be completed.

[0016] Furthermore, the system calibration in step 2) is to calibrate the test system using a standard sample with known microwave characteristics to verify the stability and accuracy of the test system.

[0017] Furthermore, step 3) is to enter the test process of relative dielectric constant and dielectric loss: click the "Sample Test" submenu under the "Test Operation" menu in the test software menu bar to measure the relative dielectric constant of the sample. After clicking "Sample Measurement", the "Test Sample Data" dialog box pops up. After all the data of the test piece has been entered, click "OK" to enter the test process of relative dielectric constant and dielectric loss of the sample.

[0018] The beneficial effects of the present invention are as follows: the measurement error of the relative dielectric constant of six brands of optical glass materials tested by the method of the present invention is less than 1.5%, and the measurement error of the dielectric loss is less than 20%. The method of the present invention adopts the measurement data to introduce error correction by diameter and is suitable for the dielectric property measurement of most optical glass materials; the method of the present invention can well reduce the measurement error of the optical glass material, so that the measurement result can better reflect the dielectric property of the optical glass material; the method of the present invention can establish the test evaluation means and test process of the technical indicators of the dielectric constant and dielectric loss electrical performance of optical glass. DETAILED DESCRIPTION

[0019] The test system of the present invention adopts the re-entrant coaxial cavity test equipment of Chengdu Enchi Microwave Technology Co., Ltd. The equipment is suitable for testing the complex dielectric constant of uniform, isotropic low-loss materials. It is used as a part of the resonant structure in the test system of the relative dielectric constant and dielectric loss of optical glass materials. The test system includes a vector network analyzer, a test cable and automatic measurement software. The system adopts a perturbation method to measure the dielectric performance parameters of optical glass materials.

[0020] The above perturbation method is a method with high testing accuracy. By placing the optical glass material sample to be tested at the place where the electric field or magnetic field is the strongest in the cavity, the electromagnetic field structure and cavity ratio in the cavity change, and the resonance parameters also change accordingly. The resonant frequency f and the quality factor Q value of the cavity before and after the perturbation are measured using a vector network analyzer, and then the relative dielectric constant ε of the optical glass material to be tested is calculated according to the perturbation theory calculation formula. 测 ˊ and dielectric loss ε 测 " of test data.

[0021] The specific method of the present invention comprises the following steps:

[0022] 1) Preparation of optical glass material test samples

[0023] The optical glass material sample should be a uniform medium without visible streaks, bubbles and stones. Two test samples are processed from the same optical glass material sample. The optical glass material sample is prepared into a cylindrical rod-shaped material with uniform diameter. The two end surfaces are finely ground or polished. The roughness Ra of the sample surface is 0.4-1.6, the parallelism is 0-0.02, and the sample diameter d is The sample length L is greater than or equal to 30 mm; the surface of the optical glass material sample is cleaned with distilled water and dried.

[0024] 2) Cavity calibration

[0025] Initialize the software of the re-entrant coaxial cavity test equipment; select the "Cavity Calibration" submenu under the "Test Operation" menu in the test software menu bar, and the "Cavity Measurement Confirmation" window will pop up. Click "Confirm" to set the equipment cavity parameters, and click "Confirm" again to wait for the cavity calibration to be completed.

[0026] 3) System calibration

[0027] Before testing optical glass material test samples, the test system must be calibrated using standard samples with known microwave properties to verify the stability and accuracy of the test system.

[0028] 4) Optical glass material sample testing

[0029] Place the optical glass material sample to be tested in the test cavity of the re-entrant coaxial cavity test equipment, click the "Sample Test" submenu under the "Test Operation" menu in the test software menu bar to measure the relative dielectric constant of the sample, and after clicking "Sample Measurement", the "Test Sample Data" dialog box pops up. After all the data of the test piece is entered, click "OK" to enter the test process of the relative dielectric constant and dielectric loss of the sample, and wait for the test of the sample to be tested to be completed.

[0030] 5) Repeat step 4) to test the relative dielectric constant and dielectric loss of the second optical glass material sample.

[0031] 6) When the test data of two pieces of the same sample glass do not differ by more than 2%, take the average value as the test result to obtain the relative dielectric constant ε 测 ˊ and dielectric loss ε 测 " data.

[0032] 7) Data correction: Due to the influence of the processing accuracy of the optical glass material sample, there is a measurement error in the measurement result. The diameter of the optical glass material sample has a great influence on the test result. The relative dielectric constant ε of the test data is corrected by the following formula (1): 测 ˊ、Dielectric loss ε 测 "Correction is performed to obtain the relative dielectric constant εˊ and dielectric loss ε":

[0033] ε=(kd)ε 测 (1)

[0034] Where:

[0035] ε: relative dielectric constant εˊ, dielectric loss ε"

[0036] k: Correction coefficient

[0037] d: Optical glass material sample diameter

[0038] ε测 : are the relative dielectric constants ε 测 ˊ、Dielectric loss ε 测 "

[0039] The correction coefficient k is calculated by mixing multiple optical glass material samples with different diameters d, and its formula is as follows (2) and (3):

[0040]

[0041] In the formula

[0042] ε0: Standard value of relative dielectric constant and dielectric loss of optical glass material samples (test value of optical glass material samples by qualified national laboratories)

[0043] n: number of samples

[0044] d1, d2…d n : are the diameters of the 1st, 2nd to nth optical glass material samples respectively

[0045] ε1, ε2…ε n : Relative dielectric constants ε of the 1st, 2nd to nth optical glass material samples respectively 测 ˊ、Dielectric loss ε 测 "

[0046] In engineering applications, it is impossible to perform fine carving on the test samples. To ensure the timeliness of the test of the optical glass material samples, the correction method of the present invention can solve the measurement error introduced by the diameter size in the processing of the optical glass material samples.

[0047] Example 1.

[0048] Take the same piece of optical glass of a certain brand 1 and process it into 5 experimental samples with different diameters. Use the re-entrant coaxial cavity test equipment to test the relative dielectric constant at a frequency of 3GHz. The test results are as follows:

[0049] <![CDATA[εˊ 测 ]]> 4.618 4.581 4.486 4.616 4.446 <![CDATA[ε 测 "]]> 0.024 0.026 0.025 0.025 0.026 d(mm) 3 2.99 2.96 2.97 2.95

[0050] The relative dielectric constant of the optical glass material sample of this brand tested by a qualified national laboratory is 4.56, and the dielectric loss is 0.031. The relative dielectric constant correction factor k of this brand is calculated by the above formula (2) (3) to be 3.97, and the relative dielectric loss correction factor k of this brand is 4.15. Another sample of this brand of optical glass with a diameter of 2.94mm is taken and the relative dielectric constant ε is tested using a re-entrant coaxial cavity test device. 测 ˊ is 4.39, dielectric loss ε 测" is 0.025. After correction by formula (1), the relative dielectric constant εˊ is 4.52. After correction, its measurement error is 0.8%, which proves that the test method meets the measurement error <1.5%. After correction, the relative dielectric constant εˊ is 0.03. After correction, its measurement error is 2.2%, which proves that the test method meets the measurement error <20%.

[0051] Example 2.

[0052] Take the same piece of optical glass of a certain brand 2 and process it into 6 experimental samples with different diameters. Use the re-entrant coaxial cavity test equipment to test the relative dielectric constant at a frequency of 6GHz. The test results are as follows:

[0053] <![CDATA[εˊ 测 ]]> 6.212 6.211 6.196 6.222 6.115 6.192 <![CDATA[ε 测 "]]> 0.034 0.036 0.035 0.036 0.033 0.034 d(mm) 2.98 3 2.99 3 2.95 2.96

[0054] The relative dielectric constant of the optical glass material sample of this brand tested by a qualified national laboratory is 6.24, and the dielectric loss is 0.042. The relative dielectric constant correction factor k of this brand is calculated by the above formula (2) (3) to be 3.96, and the relative dielectric loss correction factor k of this brand is 4.1. Another sample of this brand of optical glass with a diameter of 2.95mm is taken and the relative dielectric constant ε is tested using a re-entrant coaxial cavity test device. 测 ˊ is 6.13, dielectric loss ε 测 " is 0.035. After correction by formula (1), the relative dielectric constant εˊ is 6.19. After correction, its measurement error is 0.8%, which proves that the test method meets the measurement error <1.5%. After correction, the relative dielectric constant εˊ is 0.0405. After correction, its measurement error is 3.6%, which proves that the test method meets the measurement error <20%.

Claims

1. A method for testing the relative dielectric constant and dielectric loss of optical glass materials, characterized in that: The method comprises the following steps: 1) preparing an optical glass material sample into a cylindrical rod-shaped material with uniform diameter; 2) Cavity calibration and system calibration of re-entrant coaxial cavity test equipment; 3) Place the optical glass material sample to be tested in the test cavity of the re-entrant coaxial cavity test equipment, enter the test process of relative dielectric constant and dielectric loss, and obtain the relative dielectric constant ε 测 ˊ and dielectric loss ε 测 "data; 4) The relative dielectric constant ε is calculated by the following formula (1): 测 ˊ、Dielectric loss ε 测 "Correction is performed to obtain the relative dielectric constant εˊ and dielectric loss ε": ε=(kd)ε 测 (1) Where: ε: relative dielectric constant εˊ, dielectric loss ε" k: Correction coefficient d: Optical glass material sample diameter ε 测 : are the relative dielectric constants ε 测 ˊ、Dielectric loss ε 测 " The correction coefficient k is calculated using the following formulas (2) and (3) using multiple optical glass material samples with different diameters d: In the formula ε0: Standard value of relative dielectric constant and dielectric loss of optical glass material sample n: number of samples d1, d2…d n : are the diameters of the 1st, 2nd to nth optical glass material samples respectively ε1, ε2…ε n : Relative dielectric constants ε of the 1st, 2nd to nth optical glass material samples respectively 测 ˊ、Dielectric loss ε 测 ".

2. The method for testing the relative dielectric constant and dielectric loss of an optical glass material according to claim 1, characterized in that: Step 1) Process two optical glass material samples, repeat step 3) test the relative dielectric constant and dielectric loss of the second optical glass material sample, step 4) test the relative dielectric constant ε 测 ˊ and dielectric loss ε 测 " are the average values ​​of relative dielectric constant and dielectric loss of two optical glass material samples.

3. The method for testing the relative dielectric constant and dielectric loss of an optical glass material as claimed in claim 2, characterized in that: The relative dielectric constants ε of the two optical glass material samples 测 ˊ and dielectric loss ε 测 The test data of "difference is no more than 2%.

4. The method for testing the relative dielectric constant and dielectric loss of an optical glass material according to claim 1 or 2, characterized in that: Step 1) The two end surfaces of the optical glass material sample are finely ground or polished, the roughness Ra of the sample surface is 0.4-1.6, the parallelism is 0-0.02, and the sample diameter d is The sample length L is greater than or equal to 30 mm.

5. The method for testing the relative dielectric constant and dielectric loss of an optical glass material according to claim 1 or 2, characterized in that: Step 1) The surface of the optical glass material sample is cleaned with distilled water and dried.

6. The method for testing the relative dielectric constant and dielectric loss of an optical glass material according to claim 1 or 2, characterized in that: Step 2) The cavity calibration is: software initialization of the re-entrant coaxial cavity test equipment; select the "Cavity Calibration" submenu under the "Test Operation" menu in the test software menu bar, and the "Cavity Measurement Confirmation" window will pop up, click "Confirm", set the equipment cavity parameters, and click "Confirm" again to wait for the cavity calibration to be completed.

7. The method for testing the relative dielectric constant and dielectric loss of an optical glass material according to claim 1 or 2, characterized in that: Step 2) The system calibration is to calibrate the test system using a standard sample with known microwave characteristics to verify the stability and accuracy of the test system.

8. The method for testing the relative dielectric constant and dielectric loss of an optical glass material according to claim 1 or 2, characterized in that: Step 3) The test process of entering the relative dielectric constant and dielectric loss is: click the "Sample Test" submenu under the "Test Operation" menu in the test software menu bar to measure the relative dielectric constant of the sample. After clicking "Sample Measurement", the "Test Sample Data" dialog box pops up. After all the data of the test piece is entered, click "OK" to enter the test process of the relative dielectric constant and dielectric loss of the sample.

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