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精密仪器是指用以产生、测量精密量的设备和装置,包括对精密量的观察、监视、测定、验证、记录、传输、变换、显示、分析处理与控制。精密仪器是仪器仪表的一个重要分支。


精密仪器种类繁多、结构各异。对于用于测量的精密仪器而言,可将其结构分为基准、感受转换、转换放大传输、瞄准/读数、数据处理、显示记录、驱动控制、机械结构等八大功能部件。但并不是说一台精密仪器中必须包含上述八大功能部件,而是应根据仪器功能的要求有所选择。


1.基准部件

基准部件为测量提供标准量,测量结果均须与之比较方能得到准确的测量值。因此,它是决定精密仪器精度的主要环节。

基准器件的种类很多,如用于几何量(长度和角度)测量的标准器件:量块、精密测量丝杠、线纹尺、度盘、多面棱体、多齿分度盘、光栅尺(盘)、磁栅尺(盘)、感应同步器、光波等。对于复杂参数,有渐开线样板、表面粗糙度样板等标准件,还有提供标准运动的标准圆运动、渐开线运动和齿轮运动装置。此外还有标准硬度块、频率计,以及时间、照度、流量、色度、激光参数、温度、测力、称重等标准。可根据需要选取。


2.感受转换部件

感受转换部件感受被测量,拾取原始信号以便进一步转换、处理和分析。其精度直接影响整个仪器的精度。

有的仪器的感受转换部件仅起感受原始信号的作用,有的同时还进行一次信号的转换。感受转换部件有两大类:一类为接触式的,如各种机械式探头;一类为非接触式的,如气动非接触测头、光学探头、红外线、涡流测头、拾音器等。


3.转换放大传输部件

转换放大传输部件将感受转换来的微小信号,通过各种原理(光、机、电、气)进一步转换和放大,成为观察者或其下一部件可直接接收的信号,如显示或进一步加工处理。

在精密仪器的设计中需要考虑的主要问题包括功能、性能、精度、经济实用和外观等方面。


1.功能方面

在精密仪器的具体设计过程中,需要考虑的因素或者要求有时可能很多,但首先要满足的是功能要求,例如仪器的检测、信号分析、数据传输、数据处理、误差修正、故障诊断、控制、显示、存储、记录、打印功能等。


2.性能方面

要使精密仪器在一定的使用条件下和一定的时间内有效地实现其预期的性能,必须要求仪器工作安全可靠,操作维修方便。因此精密仪器所使用的零部件应当具有相应的强度、刚度、振动稳定性和时间稳定性等。


3.精度方面

精度是精密仪器最重要的技术指标之一,设计时必须保证精密仪器在正常工作条件下能够达到所要求的精度指标。例如有传感器的精度、工作台的运动精度、导轨的导向精度、控制系统的精度、转换电路的精度、运算精度等。


4.经济实用方面

精密仪器产品的经济性要求既是增加产品市场竞争力、赢得用户的需要,也是节约社会资源、提高社会效益的需要。提高产品的经济性是以寿命周期成本最低为目标的,要求组成精密仪器的机械、电子、光学零部件,能够最经济地被制造出来,使得零件的结构简单、工艺性好、价格低廉、实用性强。


5.外观方面

随着科技水平的提高,人们对产品外观的审美意识越来越强,尤其是新研发的各类仪器仪表。仪器外观品质的好坏,直接反映了一个企业的实力和对细节的注重,间接地反映了企业的生产状况及服务质量,还有可能影响到测量的效果。因此在设计精密仪器时应使其造型美观大方、色泽柔和,尤其要处理好一些细节的问题。

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  146. /www/wwwroot/hennvi3.lgcms.com/vendor/topthink/think-template/src/Template.php ( 46.62 KB )
  147. /www/wwwroot/hennvi3.lgcms.com/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
  148. /www/wwwroot/hennvi3.lgcms.com/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  149. /www/wwwroot/hennvi3.lgcms.com/runtime/home/temp/7da820025008da55948009e3b38e526d.php ( 26.89 KB )
  150. /www/wwwroot/hennvi3.lgcms.com/vendor/topthink/framework/src/think/Response.php ( 8.81 KB )
  151. /www/wwwroot/hennvi3.lgcms.com/vendor/topthink/framework/src/think/response/Html.php ( 0.97 KB )
  152. /www/wwwroot/hennvi3.lgcms.com/vendor/topthink/framework/src/think/Cookie.php ( 6.06 KB )
  153. /www/wwwroot/hennvi3.lgcms.com/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000518s ] mysql:host=127.0.0.1;port=3306;dbname=hennvi3;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `config` [ RunTime:0.000692s ]
  3. SELECT * FROM `config` WHERE `id` = 1 LIMIT 1 [ RunTime:0.000371s ]
  4. SHOW FULL COLUMNS FROM `system` [ RunTime:0.000456s ]
  5. SELECT * FROM `system` WHERE `id` = 1 LIMIT 1 [ RunTime:0.000236s ]
  6. SHOW FULL COLUMNS FROM `label` [ RunTime:0.000356s ]
  7. SELECT * FROM `label` ORDER BY `id` ASC [ RunTime:0.000156s ]
  8. SHOW FULL COLUMNS FROM `category` [ RunTime:0.000679s ]
  9. SELECT * FROM `category` WHERE `status` = 1 AND `pid` = -1 ORDER BY `sort` ASC,`id` ASC [ RunTime:0.000435s ]
  10. UPDATE `category` SET `is_dow` = 0 WHERE `pid` = -1 [ RunTime:0.001746s ]
  11. SELECT * FROM `category` WHERE `pid` <> -1 [ RunTime:0.000233s ]
  12. SELECT * FROM `config` WHERE `id` = 1 LIMIT 1 [ RunTime:0.000300s ]
  13. SELECT * FROM `category` WHERE `filename` = 'product' OR `link` = '/product/' LIMIT 1 [ RunTime:0.000273s ]
0.053167s