摘要
本课题是与XX公司的合作项目,研究的主要内容是基于NI虚拟仪器软硬件平台探索相对湿度信号作为洗衣干衣机(合作公司的产品)自动烘干程序结束判断条件的可行性。
湿度的采集具有一定的难度,因为湿度量不仅受相关参数特别是环境温度的影响。而测量精度高的仪器体积大、结构复杂、成本很高不利于在洗衣干衣机中集成。但是随着科学技术的发展,湿度测量仪器向集成化、智能化和多参数检测方向迅速发展,为湿度检测系统在洗衣干衣机中的应用创造了有利条件。
本论文主要完成了以下工作：
首先,选择湿度检测方法。通过实验对比分析电容式湿度传感器HS1101和数字式温湿度传感器SHT10在恒温恒湿环境和高温高湿环境中的工作性能,选择以SHT10为湿敏元件的湿度采样模块检测湿度信号。
然后,确认湿度传感器在洗衣干衣机中实际的安装位置。在初步选择的4个位置中,冷凝器出风口处的湿度信号有明显的变化趋势,并且最不容易受烘干过程中产生的冷凝水和绒毛的影响。所以,选择该位置安装湿度测量模块。
最后,分析如何利用湿度信号控制烘干程序自动结束。根据实验数据拟合出负载重量与关断相对湿度初步的线性方程,并利用8个重量等级的负载烘干实验从实际烘干效果证明了该方程的有效性。
本课题的研究弥补了湿度传感器信号在洗衣干衣机自动烘干控制领域中的应用空白,并且为洗衣干衣机烘干功能的改善开阔了思路,具有实用意义。
This project is a cooperation with XX Company, and the primary goal of the research is to explore the feasibility of relative humidity as the normal auto-drying termination condition in washer-dryer (product from XX Company) by using NI virtual instrument engineering wokbench as well as a selected humidity sensor.
It is difficulty to detect relative humidity because moisture is easily influenced by relevant environment variables especially temperature. And instruments with high measurement precision are not appropriate to be integrated in washer-dryer due to large volume, complex structure and expensive cost. But with the development of science and technology, humidity measurement instruments develop to integrated, intelligent and muti-parameter detection rapidly, and this trend is advantageous to expand the application of humidity measurement system to the field of washer-dryer.
This thesis completes the work as follows:
First, determine the method to detect moisture. Analyze the performance of comparative humidity sensor HS1101 and digital temperature and humidity sensor SHT10 by contrastive experiments in constant temperature and humidity ambient as well as high temperature and moisture environment, and has been decided to use the encapsulated mode which takes SHT10 as core element to sense moisture.
Then, confirm the installation location of humidity sensor in washer-dryer. Determine the position at condenser outlet as the ultimate one of the initial selected positions because the behavior of relative humidity is obvious and the module is least sensible to the impact of condensed water generated in drying process and fluff.
Finally, analyze how to terminate drying process automatically by humidity value. Fit preliminary liner function to describe the relationship between load mass and switch-off relative humidity by massive test data. And the function is valid from the view of the load final moisture because that value of all eight single drying tests is in target range (±3%).
This research contributes to the application of humidity sensor output signal in the domain of controlling washer-dryer teminating drying process automatically, and broadens the mind for improving the drying function of the appliance. The value for future application is significant.
引文
[1]侯建军.电子式湿度传感器的选择.四川省电子学会传感技术第九届学术年会论文集,2005,17～20
[2]白韶红.湿度测量方法与仪器的发展.仪器仪表用户,2006,4(13)：1～3
[3]林君.干湿球湿度计测量原理与影响因素研究.中国计量,2008,10：80～81
[4]梁兴中,张炯.关于干湿球法测量湿度的几点讨论.计量技术,2007,7：66～69
[5]J.Wermczuk. A new method of super-cooled water recognition in dew point hygrometer by morphology-based image processing. Sensors and Actuators A,2004, 3(1-3):240～244
[6]D.A.Mathews. Review of the Lithium Chloride radiosonde hygrometer. Proceedings of the Conference on humidity and moisture,1963,6:219～227
[7]Bairui Tao et al. Capacitive humidity sensor based on Ni/SiNWs nanocomposites. Sensors and Actuators B.2009,136:144～150
[8]Xin Lv et al. A resistive-type humidity sensor based on cross linked polyelectrolyte prepared by UV irradiation. Sensors and Actuators B,2009,135:81～586
[9]Honywell Corporation. HIH3610 Datasheet. www.honywell.com
[10]Humirel Corporation. HM1500 Datasheet, www.humirel.com
[11]Humirel Corporation. HF3223 Datasheet.www.humirel.com
[12]Humirel Corporation. HTF3223 Datasheet. www.humirel.com
[13]Sensirion Corporation. SHTxx Datasheet. www.sensirion.com
[14]F.pascal-Delannoy et al. Fast humidity sensor using optoelectronic detection on pulsed Peltier device. Sensors and Actuators B.2000,68:300～306
[15]B.Sorli et al. Fast humidity sensor for high range 80%-90%RH. Sensors and Actuators A,1998,65(2):165～170
[16]S.McMurtry et al. A multiplexed low coherence interferometric system for humidity sensing. Sensors and Actuators B,2000,67:52～56
[17]C. Bariiain et al. Optical fiber humidity sensor based on a tapered fiber coated with agarose gel. Sensors and Actuators B,2001,80:132-135
[18]喻晓莉,杨健,倪彦.湿度传感器的选用及发展趋势.自动化技术与应用,2009,28(2)：107～110
[19]Alessio Carullo, Andrea Ferrero, Marco Parvis. A microwave interferometer system for humidity measurement. Precision Electromagnetic Measurements Digest.1998,7: 528～529
[20]罗怀杰,李源鸿,郑学文.两种典型温湿度传感器的比对试验及结果.气象水文海洋仪器,2008,3：31～34
[21]程宝平,黄继昌.湿度传感器在谷物水分测量电路中的应用.太原科技,2009,2：84～85
[22]张玥,陈勇,巩娟.现代湿度测量方法评述.计量技术,2006,26(4)：1～4
[23]祝晓燕,王继选,王晋涛.光学测量法和微波测量法在湿度测量中的应用.燃气轮机技术,2007,20(3)：50～53
[24]汪锐,傅连东,郑梁.Lab VIEW在数据采集中的应用.计算机技术应用,2007,34(11)：30～35
[25]Humirel Corporation. HS1101 Datasheet. www.humirel.com
[26]李国森,陈武框.自动气象站湿度传感器自动检定系统设计.2007,4：13～15
[27]曹新亮,白泽生.一种电容式相对湿度传感器的应用.西安电子技术,2005,2：22～23
[28]程坤,秦明等.一种湿度传感器接口电路的分析与改进.微电子学,2005,6(35)：647～650
[29]张萍,黄增双.基于555定时器的数字化测湿方法的研究. 自动化技术与应用,2007,9(26)：106～107
[30]常君,李延.湿度传感器HS1101在智能家居控制系统中的应用.电子测试,2008,2：77～80
[31]蔡兵.湿度传感器测量精度提高的方法.南阳师范学院学报,2005,3：38～39
[32]邱玉娟.运用KEILC分析HS1101湿度传感器F-RH转换算法.传感器技术,2008,24：184～186
[33]陈岩,何堏.Humirel相对湿度传感器及应用.传感器世界,1999,5,35～37
[34]罗飞.低成本的数字显示湿度测量仪的设计.实验室研究与探索.2006,7(25)：764～766
[35]秦玉伟,黄钊洪.基于CAV424的无接触式电容角度传感器.研究与开发,2006,1 0：16～18
[36]Torg Stecker, Helmur Kremer.用于电容传感器信号转换的集成电路CAV424.仪表技术与传感器.2003,1：40～42
[37]陈为民.电压／电容转换电路CAV424及其在油品含水率测量的应用.中国计量学院学报,2003,14(3)：94～97
[38]宋永东,白泽生.一种基于CAV424的原油含水率检测电路的设计.传感器与微系统,2008,6(27)：83～87
[39]唐正茂,潘慧.新型电容式液位变送器的研制.传感器世界,2007,4(36)：36～38
[40]丁喜波.电容式湿度传感器测试方法与测试系统研究.哈尔滨工业大学,2005
[41]俞斌,贾雅琼.电容式湿度传感器的测试方法及其DSP的实现.仪表技术与传感器,2008.4：77～79
[42]刘兆东,许言,刘环鹏,李萌.电容式湿度传感器性能测试方法分析.信息技术,2007,2：77～79
[43]王斌,黄晓东,秦明.黄庆安一种微电容式传感器检测电路的分析与改进.传感器技术学报,2008,21(2)：265～267
[44]Nihtianov S N, Shterev G P, Iliev B, et al. An Interface Circuit for R-C Impedance Sensors with a Relaxation Oscillator. IEEE Trans. Instrumentation and Measurement, 2001,50(6):1563-1567
[45]NI Corporation. NI cDAQ-9172 USER GUIDER AND SPECIFICATIONS. www.n1.com
[46]NI Corporation. NI 9421 USER GUIDER AND SPECIFICATIONS, www.ni.com
[47]吴越,方方,周伟等.基于SHT75的氡室温湿度测试系统.核电子学与探测技术,2008,4(28)：783～785
[48]吴国宏.新型温湿度传感器SHT10的原理及应用.单片机与嵌入式系统应用,2009,1：52～54
[49]宋迪,程志华.基于SHT1 1的WSN在矿井测控系统中的应用.传感器世界,2008,6：45～49
