DOI数值代表的意义

xiulp

DOI是测流平的，DOI值越高代表流平越好

0星之刃0

wkdlxy 发表于 2011-6-17 16:44
BYK DOI仪的计算函数是DOI=F(50%du，30%wa，20%wb），其中du值对DOI的影响最大，与之有一一对应的关系，du值 ...

对，BYK公司提供的计算公式

zhangyf07

ro1673 发表于 2011-6-17 19:07
分母的“最大” 是指的什么

在今年BYK交流会议上，我问了这个问题；du值是个比值。漫反射值比上中心的光线强度值（中心的光线强度最大）。

dfxqstone

鲜映性的值最大为1，镜子的鲜映性为1，影像最清晰

qianlong5989

dqv1 发表于 2010-2-25 16:11
DOI值应该没有那么大，巴士车的DOI一般要求0.5-0.6，轿车一般要求0.8-1.0。没有DOI是40这种说法。

表述的方式不一样，你用的是PDG

qianlong5989

zhangyf07 发表于 2011-11-21 15:18
在今年BYK交流会议上，我问了这个问题；du值是个比值。漫反射值比上中心的光线强度值（中心的光线强度最大 ...

能向仁兄讨要相关资料吗

jasonhu

The required measurement scales can be selected under Instrument Configuration of the Organizer. Dependend by the instrument type, the following scales are available:
Structure Spectrum
The wave-scan DOI measures the optical profile for structure sizes up to 30 mm. By applying mathematical filter functions the structure spectrum is obtained. The measurement values Wa ... We represent certain structure sizes within a specific wavelength range.
Dullness (du) is a measure of light scattering caused by structures smaller than 0.1 mm. The measurement range goes from 0 (smooth) to 100 (highly structured). The values have no dimension.
du:
Wa:
Wb:
Wc:
Wd:
We:        Structures
Structures
Structures
Structures
Structures
Structures        smaller
from
from
from
from
from        than
0.1
0.3
1
3
10        <
-
-
-
-
-        0.1 mm
0.3 mm
1 mm
3 mm
10 mm
30 mm                 wavelength
wavelength
wavelength
wavelength
wavelength
wavelength
Longwave, Shortwave
These are the classical scales from the wave-scan plus (predecessor of the wave-scan DOI). The optical profile was limited to a range of 0.3 mm - 12 mm. The measurement data was filtered into 2 structure size ranges, LW and SW. The measurement range goes from 0 (smooth) to 100 (highly structured). The values have no dimensions.
Shortwave (SW)
Longwave (LW)        Structures
Structures        from
from        0.3
1.2        -
-        1.2 mm
12 mm        wavelength
wavelength


Calculated Scales
All following scales are calculated from the structure spectrum (Dullness, Wa ... We) or from LW and SW:
DOI – Scales
The new wave-scan DOI has an extended measurement range with a higher resolution than the wave-scan plus. Additionally, fine structures smaller than 0.1mm are measured with a CCD camera (dullness). DOI - Distinctness of Image - is influenced by these very fine structures and by the short waves Wa and Wb. Thus, DOI is calculated with these three values. The DOI-scales are correlated to existing methods:
DOI(Dorigon)
This scale correlates to the Hunter Dorigon. The Dorigon was introduced by Hunter Company in the 70ies and manufactured until 1987. The measurement principle is based on the ASTM specification E 430. The measured values are in a similar range as specular gloss readings (20°), but independent of the refractive index of the paint material.
DOI(GM)
GM is still using the Hunter Dorigon as their reference instrument. The DOI(GM) and the DOI(Dorigon) values are identical.
DOI(BYK)
Also this scale correlates to the Hunter Dorigon, but is more sensitive and shows greater differences. Therefore, the measurement values are lower than existing gloss specifications. In the instruments display, the abbreviation "BOI" is used for this scale.
Tension
These scales correlate to the "Tension Meter" which was originally developed by Renault. This instrument uses a polaroid camera to photograph a line pattern projected onto the surface. The polaroid picture had to be visually rated. The number of touching lines were a quality measure (1: very bad - 20: very good). Every automotive company interpreted the pictures a little bit different. Therefore, several Tension scales were created in the wave-scan. The correlation is mainly based on Longwave (LW).
Tension
GM - Tension
MB - Tension
P - Tension        The original Tension scale with extended measurement range
Correlation is based on GM specifications
Correlation is based on Mercedes Benz specifications
Correlation is based on Honda specifications
Rating
The Rating Scale is especially known at US automotive manufacturers. The scale is based on a set of 10 orange peel panels ranked from 1 (bad) to 10 (good). The correlation is mainly based on Longwave data
Hada Note (outdated)
The Hada scale was developed together with Toyota. This scale is based on a set of 6 panels ranked from 1 (bad) to 6 (good). Toyota specified 1998 new scales (W1 ... W4) which are measured with the "wave-scan T" (developed in co-operation with Toyota).
MIC Note and M-WS (outdated)
In co-operation with Mitsubishi the Long- and Shortwave data were correlated to their visual evaluation of orange peel. A new equation is currently under development based on the wave-scan DOI.
MIC-value is based on Longwave and Shortwave,
Best = 100 and Worst =0
If LW = SW --> M-WS value = MIC-value
If SW > LW --> MIC-value gets worse.

M-WS and MIC-value are both scales developed for Mitsubishi prior to wave-scan DOI (i.e. before 2000).

M-WS value is based on Longwave,
Best = 100, Worst = 0

Autospect QMS-System
Perceptron manufactures a semi-portable testing instrument to evaluate Orange Peel and DOI. Some automotive makers (Ford, Chrysler, Peugeot) established this system as their standard - several years ago. The measurement results consist of 4 values:

Luster
Sharpness
Orange Peel
Combined        a scale for gloss
a scale for DOI
a scale for longer waves with structure sizes between 1 - 6 mm
an overall rating based on the 3 scales, the weighting of the 3 values varies by automotive maker
Ford Specific Scales
In order to use existing specifications and at the same time use the benefits of the wave-scan, correlation functions to the QMS were developed with Ford Motor Company:
Old Scale: CR-Overall
This combined note is based on the wave-scan plus scales LW and SW. Therefore, only a correlation factor of 80% was achieved and only high gloss samples readings could be compared.
New Scales:
The new wave-scan DOI allowed to improve the correlation using the complete structure spectrum. Now, together with Ford correlation functions were established to the individual scales: Luster (LU), Sharpness (SH) and Orange Peel (OP). The Combined note "CF" uses the specific weighting function of the Ford Motor Company:
15% Luster, 35% Sharpness, 50% Orange Peel.
DaimlerChrysler Scales
The DC specific scales also correlate to the QMS system:
Gloss DCA (GL), Dori DCA(DI) and Orange Peel DCA (OP).
The DaimlerChrysler Combined Note, Over All DCA (OA) uses a different weighting function than the Ford Combined Note:
20% Gloss, 40% Dori, 40% Orange Peel.
Peugeot Specific Scales
The Autospect QMS - system was specified with Peugeot specific scales for DOI and Waviness.
PN: PSA DOI
Peugeot has been using the QMS system for evaluation of DOI or sharpness. The PN-value correlates with this sharpness value based on Peugeot evaluations.
PP: PSA Orange Peel
Peugeot has been using a system from Siemens called Topomat to measure orange peel. The PP-scale correlates with these measurement results.
PP and PN are currently under evaluation and therefore, labeled with Version 1.0. The official release is planned for mid of 2002.

yyyegucheng

ZHOUSHIOK 发表于 2010-2-25 16:08
谢谢楼上的朋友！
表面越平整光滑DOI值越高，这是没问题的。
但它是通过测量什么得来的啊？是漫反射率，反 ...

光泽我测出超过100的呢   

yyyegucheng

dqv1 发表于 2010-2-25 16:12
平整光洁的涂膜能像镜面一样反映出物体的影像(或投影)，其反映影像的清晰程度，称为鲜映度，以DOI值表示。测 ...

怎么可能小于1？？

我测量出来的DOI没有不大于80的，深色漆更为明显。浅色漆稍差。

请教版主一个问题：汽车测量最后评定标准中的R指的又是什么？如何计算或者衡量？

jasonhu

R一般代表粗糙度

jasonhu

粗糙度仪器，波统计后数学出

lanlang001

DOI是鲜映度，PGD为鲜映性，2者有大概换算的比列吗？
如D0I   80,相当于PGD 多少？

wangxi-1

lanlang001 发表于 2012-2-1 09:50
DOI是鲜映度，PGD为鲜映性，2者有大概换算的比列吗？
如D0I   80,相当于PGD 多少？

是不是就是百分比的问题，以哪个为参照物

森林

学习了。
两者什么样的关系，如何换算？

zhangzifu86

不错，学习下

chen123027

我们这边用的是NID，请问下有何不同呢

poly.c

DOI和PGD都是表征漆膜对影像清晰度的一个反映，两者是同一个含义，但为什么会有这两个说法呢？
因为这是2个不同的仪器测试出来的，DOI是采用BYK公司的桔皮仪测试的，PGD是采用鲜映度测定仪测试的，
目前用的越来越多、越广泛的是DOI,两者很难说如何转换，但是DOI高的，相应的PGD一定高，反之亦然。。

poly.c

chen123027 发表于 2012-3-17 00:24
我们这边用的是NID，请问下有何不同呢

NID也是漆膜外观的一个测试标尺（可以采用BYK桔皮仪测试），它是Nissan在2004年提出的指标，综合考量了漆膜目视和结构谱图基础上获得的数值，数值越小，外观越好。。。

poly.c

yyyegucheng 发表于 2012-1-18 06:28
怎么可能小于1？？

我测量出来的DOI没有不大于80的，深色漆更为明显。浅色漆稍差。

在BYK桔皮仪中，用来评测漆膜外观的综合指标，它是美国汽车制造厂基于ACT标准的一个综合评价值，主要与长波有关，范围3～10.5，数值越大，外观越好

顽强的虫子

路过学习~~