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Pyranometer and photometric device

A technology of intensity meter and light, which is applied in measuring devices, photometry using electric radiation detectors, photometry, etc., can solve problems such as sensor errors and achieve the effect of reducing COS errors

Inactive Publication Date: 2019-05-14
EKO INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the light receiving element has a light receiving angle like a sensor housed in a package, there is an error (COS error) between the output value (irradiance) of the sensor and the theoretical value of the irradiance depending on the incident angle θ The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0050] figure 1 It is a side cross-sectional view showing an example of a schematic configuration of a pyranometer 100 according to an embodiment of the present invention. The pyranometer 100 is, for example, a pyranometer defined and classified according to the ISO9060 standard. Additionally, a spectroradiometer may also be included in the pyranometer. like figure 1 As shown, the pyranometer 100 includes a condenser lens (first lens) 10 , a light shielding ring 20 , a sensor 30 , and a housing 40 .

[0051] The condensing lens 10 is a lens for condensing incident light and guiding the light to the sensor 30 , for example, a concave meniscus lens can be used. A light-shielding ring 20 is provided between the condenser lens 10 and the sensor 30 .

[0052] The light-shielding ring 20 is a member having a light-transmitting region 25 in the center. The light-shielding ring 20 is composed of one or more parts (workpieces), preferably has a predetermined or higher strength and...

Embodiment approach 2

[0059] Figure 4 It is a side sectional view showing an example of a schematic configuration of a pyranometer 101 according to an embodiment of the present invention. and figure 1 The same symbols indicate the same or similar structures. Such as Figure 4 As shown, the pyranometer 101 includes not only the light-shielding ring 20 but also light-shielding rings 21 and 22 . Like the light-shielding ring 20 , the light-shielding rings 21 and 22 have a light-transmitting region 25 at the center, and the center of the light-transmitting region 25 is located on the optical axis of the condensing lens 10 .

[0060] The three light-shielding rings 20 to 22 are configured such that the area becomes smaller as they are closer to the sensor 30 , that is, the area of ​​the light-transmitting region 25 becomes smaller in the order of the light-shielding ring 22 , the light-shielding ring 21 , and the light-shielding ring 20 .

[0061] Figure 5 It is a diagram schematically showing li...

Embodiment approach 3

[0065] Figure 7 It is a side cross-sectional view showing an example of a schematic configuration of a pyranometer 102 according to an embodiment of the present invention. and figure 1 , Figure 4 The same symbols indicate the same or similar structures. Such as Figure 7 As shown, the pyranometer 102 has two light shielding rings 20 , 21 . In addition, the pyranometer 102 includes a condenser lens 11 between the condenser lens 10 and the light shielding ring 21 .

[0066] Figure 8 It is a graph showing an example of the relationship between the incident angle measured by the pyranometer 102 and the COS error. Figure 8 The horizontal axis in the center is the incident angle (°), and the vertical axis is the COS error (%). and image 3 It can be seen from the comparison of the graphs of the pyranometer 102 that the COS error of the pyranometer 102 is significantly improved compared with the pyranometer of the comparative example.

[0067] As described above, accordi...

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Abstract

A pyranometer which utilizes a sensor having an acceptance angle and which can fully reduce the COS error is provided. The pyranometer comprises: a light sensor; a first lens arranged to face a light-receiving surface of the light sensor; and a light-shielding ring arranged between the light sensor and the first lens, the light-shielding ring having a light-transmissive region allowing transmission of light at some angles of incidence in the light passing through the first lens.

Description

technical field [0001] The present invention relates to a pyranometer and a photometer for measuring the intensity or amount of solar radiation. Background technique [0002] For many years, solar radiation has been measured by radiation sensors called pyranometers (hereinafter, pyranometers) as defined and classified according to the ISO9060 standard. The most widely used type of pyranometer uses a flat panel thermal sensor (thermopile) with a face of black absorbing material for receiving radiation in the range of the sunlight spectrum (primary wavelength 300-3000nm). [0003] In recent years, products of new thermal sensors that use thin-film thermopiles instead of flat thermal sensors (thermopiles) are increasing. Thin-film thermopiles have a faster response speed than thermopiles, and have the advantage of being able to respond to short-term changes in irradiance from the sun. However, the light receiving part of the thin film thermopile is generally housed in the pac...

Claims

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Application Information

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IPC IPC(8): G01J1/42G01J1/06
CPCG01J1/04G01J1/0411G01J1/0474G01J1/42G01J2001/0485G01J2001/4285
Inventor 长谷川寿一秋山明仁矢野绫子
Owner EKO INSTR
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