CN103278264B - A kind of calibration steps of surface source blackbody temperature accuracy and calibration system thereof - Google Patents

A kind of calibration steps of surface source blackbody temperature accuracy and calibration system thereof Download PDF

Info

Publication number
CN103278264B
CN103278264B CN201310180695.1A CN201310180695A CN103278264B CN 103278264 B CN103278264 B CN 103278264B CN 201310180695 A CN201310180695 A CN 201310180695A CN 103278264 B CN103278264 B CN 103278264B
Authority
CN
China
Prior art keywords
temperature
blackbody
base measuring
point
measuring temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201310180695.1A
Other languages
Chinese (zh)
Other versions
CN103278264A (en
Inventor
韩顺利
胡为良
罗文健
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CLP Kesiyi Technology Co Ltd
Original Assignee
CETC 41 Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CETC 41 Institute filed Critical CETC 41 Institute
Priority to CN201310180695.1A priority Critical patent/CN103278264B/en
Publication of CN103278264A publication Critical patent/CN103278264A/en
Application granted granted Critical
Publication of CN103278264B publication Critical patent/CN103278264B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Radiation Pyrometers (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

The present invention is applicable to temperature correction field, provides a kind of calibration steps of surface source blackbody temperature accuracy, comprising: steps A: within the scope of extend blackbody design temperature, choose the individual different base measuring temperature point of M; Step B: utilize measurement standard platinum-resistance thermometer to carry out temperature survey by calibration hole to area blackbody radiation source at each base measuring temperature point, obtain true temperature value T i, and the radiation temperature t of the extend blackbody self of record correspondence i; Step C: the true temperature value that the radiation temperature of the extend blackbody self of each base measuring temperature point and measurement standard platinum-resistance thermometer are measured is carried out linear fit, calculates correction factor; Step D: utilize correction factor, corrects surface source blackbody temperature.The object of described calibration steps is the nonlinearity erron correcting platinum resistance temperature measuring system further, improves the measuring accuracy of whole system within the scope of total temperature, improves the calibration accuracy of extend blackbody radiation temperature accuracy, meets high precision measurement demand.

Description

A kind of calibration steps of surface source blackbody temperature accuracy and calibration system thereof
Technical field
The invention belongs to temperature correction technical field, particularly relate to a kind of calibration steps and calibration system thereof of surface source blackbody temperature accuracy.
Background technology
High precision extend blackbody infrared origin is as the underlying instrument of infrared test and calibration, and the radiation of outgoing can be full of visual field, convenient calibration and measuring, and can improve and measure and the precision of calibration, and demand is very large, has broad application prospects.Extend blackbody utilizes platinum resistance temperature sensor to carry out temperature control and measurement to radiating surface, the temperature variant voltage of platinum resistance that unbalanced bridge is measured is carried out amplifying rear input A/D convert, utilize the funtcional relationship between resistance and temperature to carry out measuring tempeature by the measurement of resistance, finally in single-chip microcomputer, carry out computing and process.Platinum resistance temperature sensor has the features such as stable performance, reproducible, accuracy is high, temperature-measuring range is large, therefore commercialization extend blackbody is generally the precision of only mark platinum resistance temperature sensor in the index of temperature accuracy both at home and abroad at present, and wherein platinum resistance temperature accuracy determines according to the grade of the platinum resistance adopted.But owing to there is nonlinear relationship between the resistance of platinum resistance and temperature, especially in high temperature section, and the systematic error of resistance measurement and the impact such as lead-in wire, environment temperature, also can bring impact to the temperature measurement accuracy of extend blackbody entire system, therefore be necessary to calibrate the accuracy of extend blackbody complete machine temperature.
Because system of Pt-resistance can be designed to linear system approx, therefore current temperature accuracy calibration steps is the two point calibration method algorithms based on blackbody radiation temperature two-end-point.By adopting measurement standard platinum-resistance thermometer to measure at two end points of extend blackbody control temperature, obtain the true temperature value T of two points for measuring temperature 1and T 2, record self radiation temperature t of corresponding extend blackbody simultaneously 1and t 2, according to linear fit formula:
t 1 = kT 1 + b t 2 = kT 2 + b ⇒ k = t 1 - t 2 T 1 - T 2 b = t 1 T 2 - t 2 T 1 T 2 - T 1
Calculate correction factor k and b, thus the temperature accuracy within the scope of total temperature is corrected.
Although two point calibration method algorithms of existing technology are simple, operand is little, calibration is convenient, nonlinearity erron is too large, and temperature accuracy calibration accuracy is too poor.
Summary of the invention
Technical matters to be solved by this invention is the calibration steps and the calibration system thereof that provide a kind of surface source blackbody temperature accuracy, and purport in the prior art surface source blackbody temperature adopts the two point calibration algorithms based on blackbody radiation temperature two-end-point to carry out calibrating the problem that precision is too poor in actual applications.
The present invention is achieved in that a kind of calibration steps of surface source blackbody temperature accuracy, wherein, comprises the following steps:
Steps A: choose the individual different base measuring temperature point of M within the scope of extend blackbody design temperature;
Step B: utilize high-precision measurement standard platinum-resistance thermometer to carry out temperature survey by calibration hole to area blackbody radiation source at each base measuring temperature point described, obtain the true temperature value T of each base measuring temperature point i, record the radiation temperature t of extend blackbody self corresponding to described each base measuring temperature point simultaneously i;
Step C: the true temperature value that the radiation temperature of the extend blackbody self of each base measuring temperature point described and measurement standard platinum-resistance thermometer are measured is carried out linear fit, and calculates correction factor k i, b i;
Step D: utilize described correction factor, surface source blackbody temperature is corrected.
The calibration steps of described surface source blackbody temperature accuracy, wherein, being chosen for of the point of base measuring temperature described in described steps A is chosen in the temperature range of setting.
The calibration steps of described surface source blackbody temperature accuracy, wherein, forms a segmentation between individual different every two points of base measuring temperature point of M described in described steps A, the design temperature of described extend blackbody is divided into some segmentations and calibrates.
The calibration steps of described surface source blackbody temperature accuracy, wherein, calculates correction factor k in described step C i, b iformula be:
t i ( R i ) = k i T i + b i t i + 1 ( R i + 1 ) = k i T i + 1 + b i ⇒ k i = t i + 1 ( R i + 1 ) - t i ( R i ) T i + 1 - T i b i = t i ( R i ) T i + 1 - t i + 1 ( R i + 1 ) T i T i + 1 - T i , Wherein, T ibe the true temperature value of i-th base measuring temperature point, t ibe the radiation temperature of the extend blackbody self that i-th base measuring temperature point is corresponding, 1≤i≤M-1.
The calibration steps of described surface source blackbody temperature accuracy, wherein, described step D comprises: by 2 multistage linear correcting algorithms, correct the surface source blackbody temperature in each segmentation.
The present invention also provides a kind of calibration system of surface source blackbody temperature accuracy, wherein, comprising:
Base measuring temperature point chosen module, will choose the individual different base measuring temperature point of M within the scope of extend blackbody design temperature;
Temperature-measuring module, be connected with described base measuring temperature point chosen module, utilize high-precision measurement standard platinum-resistance thermometer to carry out temperature survey by calibration hole to area blackbody radiation source at each base measuring temperature point described, obtain the true temperature value T of each base measuring temperature point i, and record the radiation temperature t of extend blackbody self corresponding to described each base measuring temperature point simultaneously i;
Computing module, be connected with described temperature-measuring module, the true temperature value that the radiation temperature of the extend blackbody self of each base measuring temperature point measured by described temperature-measuring module and measurement standard platinum-resistance thermometer are measured carries out linear fit, and calculates correction factor k i, b i;
Correction module, is connected with described computing module, and the correction factor utilizing described computing module to calculate, corrects surface source blackbody temperature.
The calibration system of described surface source blackbody temperature accuracy, wherein, described base measuring temperature point chosen module also comprises line segment constructing module, described line segment constructing module is used for forming a segmentation by between individual for described M different every two points of base measuring temperature point, the design temperature of described extend blackbody is configured to some segmentations and calibrates.
The calibration system of described surface source blackbody temperature accuracy, wherein, described computing module comprises automatic computing module, and described automatic computing module is by correction factor k i, b iformula
t i ( R i ) = k i T i + b i t i + 1 ( R i + 1 ) = k i T i + 1 + b i ⇒ k i = t i + 1 ( R i + 1 ) - t i ( R i ) T i + 1 - T i b i = t i ( R i ) T i + 1 - t i + 1 ( R i + 1 ) T i T i + 1 - T i , Wherein, T ibe the true temperature value of i-th base measuring temperature point, t ibe the radiation temperature of the extend blackbody self that i-th base measuring temperature point is corresponding, 1≤i≤M-1 asks for correction factor k automatically i, b i.
The calibration system of described surface source blackbody temperature accuracy, wherein, described correction module comprises correcting algorithm module, and described correcting algorithm module, by 2 multistage linear correcting algorithms, corrects the surface source blackbody temperature in each segmentation.
The calibration steps of a kind of surface source blackbody temperature accuracy based on 2 multistage linear correcting algorithms of calibration steps of a kind of surface source blackbody temperature accuracy that the present invention proposes, in total temperature scope internal calibration extend blackbody radiation temperature, improve the temperature accuracy of complete machine, and trace to the source easily, precision is high.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the calibration steps of the surface source blackbody temperature accuracy that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The present invention proposes a kind of calibration steps of surface source blackbody temperature accuracy, object is the nonlinearity erron correcting platinum resistance temperature measuring system further, the measuring accuracy of whole system is improved within the scope of total temperature, improve the calibration accuracy of extend blackbody radiation temperature accuracy, meet high precision measurement demand.
The present invention adopts 2 multistage linear correcting algorithms, the scope that arranged by the platinum resistance temperature of extend blackbody is divided into some sections and calibrates, in each section, utilize linear segmented function to approach nonlinear characteristic curve, namely adopt multistage broken line chain to replace true nonlinear curve.By the method corrected in sectional calibration point internal linear, temperature accuracy calibration is carried out to extend blackbody total system, the nonlinearity erron that the non-equilibrium bridge for measuring temperature of further reduction platinum resistance, platinum resistance self and lead resistance etc. are brought, improves surface source blackbody temperature accuracy measuring accuracy.
As shown in Figure 1, a kind of calibration steps of surface source blackbody temperature accuracy, comprises the following steps:
Steps A: choose the individual different base measuring temperature point of M within the scope of extend blackbody design temperature;
Step B: utilize high-precision measurement standard platinum-resistance thermometer to carry out temperature survey by calibration hole to area blackbody radiation source at each base measuring temperature point described, obtain the true temperature value T of each base measuring temperature point i, record the radiation temperature t of extend blackbody self corresponding to described each base measuring temperature point simultaneously i;
Step C: the true temperature value that the radiation temperature of the extend blackbody self of each base measuring temperature point described and measurement standard platinum-resistance thermometer are measured is carried out linear fit, and calculates correction factor k i, b i; Described correction factor k iand b icomputing formula be:
t i ( R i ) = k i T i + b i t i + 1 ( R i + 1 ) = k i T i + 1 + b i ⇒ k i = t i + 1 ( R i + 1 ) - t i ( R i ) T i + 1 - T i b i = t i ( R i ) T i + 1 - t i + 1 ( R i + 1 ) T i T i + 1 - T i , Wherein, T ibe the true temperature value of i-th base measuring temperature point, t ibe the radiation temperature of the extend blackbody self that i-th base measuring temperature point is corresponding, 1≤i≤M-1;
Step D: utilize correction factor, is corrected the surface source blackbody temperature in each segmentation by 2 multistage linear correcting algorithms, thus realizes the high-precision calibration of surface source blackbody temperature accuracy within the scope of total temperature.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.

Claims (3)

1. a calibration steps for surface source blackbody temperature accuracy, is characterized in that, comprises the following steps:
Steps A: choose the individual different base measuring temperature point of M within the scope of extend blackbody design temperature, forms a segmentation between individual different every two points of base measuring temperature point of described M;
Step B: utilize high-precision measurement standard platinum-resistance thermometer to carry out temperature survey by calibration hole to area blackbody radiation source at each base measuring temperature point described, obtain the true temperature value T of each base measuring temperature point i, record the radiation temperature t of extend blackbody self corresponding to described each base measuring temperature point simultaneously i;
Step C: the true temperature value that the radiation temperature of the extend blackbody self of each base measuring temperature point described and measurement standard platinum-resistance thermometer are measured is carried out linear fit, and calculates correction factor k i, b i, and described calculating correction factor k i, b iformula be:
t i ( R i ) = k i T i + b i t i + 1 ( R i + 1 ) = k i T i + 1 + b i ⇒ k i = t i + 1 ( R i + 1 ) - t i ( R i ) T i + 1 - T i b i = t i ( R i ) T i + 1 - t i + 1 ( R i + 1 ) T i T i + 1 - T i , Wherein, T ibe the true temperature value of i-th base measuring temperature point, t ibe the radiation temperature of the extend blackbody self that i-th base measuring temperature point is corresponding, 1≤i≤M-1, R iit is the resistance value of the measurement standard platinum-resistance thermometer that i-th base measuring temperature point is corresponding;
Step D: utilize described correction factor, by 2 multistage linear correcting algorithms, corrects the surface source blackbody temperature in each segmentation.
2. the calibration steps of surface source blackbody temperature accuracy according to claim 1, is characterized in that, being chosen for of the point of base measuring temperature described in described steps A is chosen in the temperature range of setting.
3. a calibration system for surface source blackbody temperature accuracy, is characterized in that, comprising:
Base measuring temperature point chosen module, will choose the individual different base measuring temperature point of M within the scope of extend blackbody design temperature;
Temperature-measuring module, be connected with described base measuring temperature point chosen module, utilize high-precision measurement standard platinum-resistance thermometer to carry out temperature survey by calibration hole to area blackbody radiation source at each base measuring temperature point described, obtain the true temperature value T of each base measuring temperature point i, and record the radiation temperature t of extend blackbody self corresponding to described each base measuring temperature point simultaneously i;
Computing module, be connected with described temperature-measuring module, the true temperature value that the radiation temperature of the extend blackbody self of each base measuring temperature point measured by described temperature-measuring module and measurement standard platinum-resistance thermometer are measured carries out linear fit, and calculates correction factor k i, b i;
Correction module, is connected with described computing module, and the correction factor utilizing described computing module to calculate, corrects surface source blackbody temperature; Wherein:
Described base measuring temperature point chosen module also comprises line segment constructing module, for forming a segmentation by between individual for described M different every two points of base measuring temperature point;
Described computing module also comprises automatic computing module, and described automatic computing module is by correction factor k i, b iformula
t i ( R i ) = k i T i + b i t i + 1 ( R i + 1 ) = k i T i + 1 + b i ⇒ k i = t i + 1 ( R i + 1 ) - t i ( R i ) T i + 1 - T i b i = t i ( R i ) T i + 1 - t i + 1 ( R i + 1 ) T i T i + 1 - T i , Wherein, T ibe the true temperature value of i-th base measuring temperature point, t ibe the radiation temperature of the extend blackbody self that i-th base measuring temperature point is corresponding, 1≤i≤M-1, R ibe the resistance value of the measurement standard platinum-resistance thermometer that i-th base measuring temperature point is corresponding, automatically ask for correction factor k i, b i;
Described correction module comprises correcting algorithm module, for by 2 multistage linear correcting algorithms, corrects the surface source blackbody temperature in each segmentation.
CN201310180695.1A 2013-05-16 2013-05-16 A kind of calibration steps of surface source blackbody temperature accuracy and calibration system thereof Active CN103278264B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310180695.1A CN103278264B (en) 2013-05-16 2013-05-16 A kind of calibration steps of surface source blackbody temperature accuracy and calibration system thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310180695.1A CN103278264B (en) 2013-05-16 2013-05-16 A kind of calibration steps of surface source blackbody temperature accuracy and calibration system thereof

Publications (2)

Publication Number Publication Date
CN103278264A CN103278264A (en) 2013-09-04
CN103278264B true CN103278264B (en) 2016-02-17

Family

ID=49060849

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310180695.1A Active CN103278264B (en) 2013-05-16 2013-05-16 A kind of calibration steps of surface source blackbody temperature accuracy and calibration system thereof

Country Status (1)

Country Link
CN (1) CN103278264B (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104614076A (en) * 2015-01-27 2015-05-13 天津大学 Precision calibrating method of infrared thermometer with wide temperature range
CN105823713A (en) * 2016-05-24 2016-08-03 深圳市蜂联科技有限公司 Method for improving measuring precision of air quality detection device through iteration optimal calibration
CN107607229A (en) * 2017-09-14 2018-01-19 武汉昊博科技有限公司 Method for the temperature calibration instrument and progress temperature correction of thermosphere analysis probe
CN107727061B (en) * 2017-09-27 2021-03-09 武汉霸云创新科技有限公司 Photoelectric distance measurement system and method for autonomous weather correction
CN110057468A (en) * 2019-01-31 2019-07-26 西安和其光电科技股份有限公司 A kind of scaling method applied to temperature measuring equipment
CN109870487B (en) * 2019-02-18 2021-06-22 中国石油天然气集团有限公司 Method, device and system for compensating resistance of conductivity sensor verification lead
CN110006529B (en) * 2019-04-15 2020-12-01 烟台艾睿光电科技有限公司 Output correction method and device for infrared detection device
CN110702274B (en) * 2019-11-06 2021-01-26 中国计量科学研究院 Space calibration method based on accurate miniature phase-change fixed point blackbody model
CN111307293B (en) * 2020-03-26 2021-10-01 烟台艾睿光电科技有限公司 Infrared human body temperature measurement system and temperature measurement method thereof
CN111397755B (en) * 2020-04-08 2021-04-27 上海电机系统节能工程技术研究中心有限公司 Correction method for absolute error of temperature measuring instrument
CN111693154B (en) * 2020-06-19 2021-10-08 深圳蓝韵健康科技有限公司 Temperature compensation method and device for infrared temperature measurement sensor
CN113865750A (en) * 2021-08-23 2021-12-31 上海探寻信息技术有限公司 Temperature measurement calibration method of non-contact equipment and non-contact equipment
CN113916384B (en) * 2021-09-30 2024-03-19 云南电网有限责任公司电力科学研究院 Method for controlling temperature of blackbody radiation source based on multivariate statistical analysis modeling
CN114353969A (en) * 2021-12-28 2022-04-15 江苏弘冉智能科技有限公司 Infrared temperature measuring device capable of being calibrated and calibration method thereof
CN117906767B (en) * 2024-03-20 2024-07-12 国科大杭州高等研究院 Large-area source blackbody temperature self-correction method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102252770A (en) * 2011-04-29 2011-11-23 中冶赛迪工程技术股份有限公司 Temperature-measurement compensating method and corrective type high-accuracy thermometer
CN102818636A (en) * 2012-09-03 2012-12-12 北京理工大学 Radiometric calibration method for low-temperature measurement of thermal infrared imager

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08178764A (en) * 1994-12-24 1996-07-12 Tanaka Kikinzoku Kogyo Kk Calibration of r thermocouple
US7826991B2 (en) * 2007-07-25 2010-11-02 Rosemount Inc. Temperature-averaging field device compensation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102252770A (en) * 2011-04-29 2011-11-23 中冶赛迪工程技术股份有限公司 Temperature-measurement compensating method and corrective type high-accuracy thermometer
CN102818636A (en) * 2012-09-03 2012-12-12 北京理工大学 Radiometric calibration method for low-temperature measurement of thermal infrared imager

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
喷油泵试验台温度测量及线性化校正;齐观英等;《计算机测量与控制》;20061231;580-582 *
面源黑体辐射特性校准系统的校准方法;卫昱含;《科技信息》;20081231;117-118 *

Also Published As

Publication number Publication date
CN103278264A (en) 2013-09-04

Similar Documents

Publication Publication Date Title
CN103278264B (en) A kind of calibration steps of surface source blackbody temperature accuracy and calibration system thereof
CN108152325B (en) Method for calibrating heat conductivity instrument based on heat shield plate method
CN101706346B (en) Method for compensating for nonlinear temperature drift of measurement of intelligent force sensor
CN111307293B (en) Infrared human body temperature measurement system and temperature measurement method thereof
CN103698056B (en) Demarcate temperature error correcting device and modification method
CN104614076A (en) Precision calibrating method of infrared thermometer with wide temperature range
CN103759851A (en) Temperature compensation method used for thermal resistance collecting module
CN102818635A (en) Method for improving calibration precision of infrared sensor
CN103604525B (en) A kind of thermal resistance temperature surveying instrument based on checking data
CN102116687B (en) Method for calibrating temperature precision of temperature sensor chip
CN104970776B (en) A kind of body temperature detection method and a kind of Dynamic High-accuracy calibration electric body-temperature counter device
CN105527038B (en) Platinum thermal resistance sensor error correcting method and the calorimeter with this method thermometric
CN104977557A (en) Device and method for calibrating contact resistance tester
KR20200025784A (en) System and method for correcting current value of shunt resistor
CN116296047B (en) Temperature compensation improvement method of monocrystalline silicon pressure transmitter
CN109375291A (en) A kind of temperature and air pressure suitable for sonde and humidity measuring instrument and method
CN109945992A (en) A kind of calibration method of the electronic tag with temperature sensor
CN113418635A (en) High-precision temperature measuring method and measuring system
CN105277112A (en) A half-bridge Wheatstone bridge strain measuring system and method capable of eliminating conductor resistance influence
US20210235570A1 (en) Filament current control method and apparatus
CN202433129U (en) Calibrating device for ultrasonic calorimeter
CN103487170B (en) A kind of multichannel temperature logging calibrating installation and calibration steps thereof
CN105466575B (en) Measuring device and calibration method for consistency calibration
CN109620200A (en) A kind of device and method of intracranial pressure, encephalic temperature testing calibration
CN109407140B (en) Multi-path photomultiplier leveling device for PET detector

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20190312

Address after: 266000 No. 98 Xiangjiang Road, Huangdao District, Qingdao City, Shandong Province

Patentee after: China Electronics Technology Instrument and Meter Co., Ltd.

Address before: 266000 No. 98 Xiangjiang Road, Qingdao economic and Technological Development Zone, Shandong

Patentee before: The 41st Institute of CETC

TR01 Transfer of patent right
CP03 Change of name, title or address

Address after: 266555 No. 98 Xiangjiang Road, Huangdao District, Qingdao City, Shandong Province

Patentee after: CLP kesiyi Technology Co.,Ltd.

Address before: 266000 No. 98 Xiangjiang Road, Huangdao District, Qingdao City, Shandong Province

Patentee before: CHINA ELECTRONIC TECHNOLOGY INSTRUMENTS Co.,Ltd.

CP03 Change of name, title or address