flow elbow,流量弯管

flow measurement calibration device,流量测量校准装置

flow measuring device,流量测量装置

flow nozzle,流量喷嘴

flow profile,流动剖面

flow rate of mobile phase,流动相流速

flow sihnal,流量信号

flow stabilizer,流量稳定器

flow switch,流量开关

flow to close,流关

flow to open,流开 flow transducer[sensor],流量传感器

flowmeter,流量计

flow-rate,流量

flow-rate range,流量范围

fluctuation,波动（度）

fluid damping galvanometer,液体阻尼振动子

fluidic flowmeter,射流流量计

fluorescence,荧光修正

fluorescence detector,荧光检测器

fluorescence effect,荧光效应

fluorescent image,荧光象

flurescent magnetic partcle,荧光磁粉

fluorescent magnetic particle inspection machine,荧光磁粉探伤机

fluorescent penetrant festing method,荧光渗透探伤法

fluorine plastic,氟塑料

fluorine rubber(viton),氟橡胶

fluorometer,荧光计 flush mounted(pressure)gauge,，嵌装压力表

flutter,颤振

flux constant,磁通常数

flux meter,磁通表

flux of radiation,辐射通量

fluxgate compass,磁通门罗盘

fluxgate magnetometer,磁通门磁力仪；磁通门磁强计

fluxmeter,磁通表

fluxmeter calibrator,磁通表校验仪

focal distance,焦距

focal plane,焦平面

focal point,焦点

focus,焦点

focus size,焦点尺寸

focus-to-film distance,焦距

focusing,聚焦

focusing type probe,聚焦探头

fog-gauge,雾量器

foil strain gauge,箔式应变计

folding chart[paper],折叠式记录纸

follow-up control,随动控制

follow-up pointer,从动针

food analyzer,食品分析仪

force,力

force-balance acceleration transducer,力平衡式加速度传感器

force-balance accelerometer,力平衡式加速度计

force convection,强近对流

force standard machine,力标准机

force transducer[sensor],力传感器

forced vibration,强迫振动；受迫振动

foregraound,前台 foreground processing,前台处理

foreground program,前台程序

form factor,波形因数

Fortin barometer,福丁气压表

forward channel,正向信道

Foundation Fieldbus(FF),基金会现场总线；FF总线

four-terminal standard resistor,四端（钮）标准电阻器

Fourier transform,傅里叶变换

Fouier transform ion cyclotron resonance mass spertrometer (FT-ICR-MS), 傅立叶变换离子回旋共振质谱计

Fourier transform infrared spectrometry,傅立叶变换红外光谱法

Fourier transform spectrometer,傅里叶变换光谱仪

fracture toughness,断裂韧性

fragment ion,碎片离子

fragmentation,碎裂过程

frqgmentation pattern,碎裂图型

frame,帧 framework,框架

free falling STD profilinge system,自返式温盐深剖面仪

free field,自由声场

free field correction curves,自由场修正曲线

free-field frequency response of microphone,传声器自由声场频率响应

free field reciprocity calibration,自由声场互易校准

free-field sensitivity of microphone,传声器自由声场灵敏度

free induction decay signal;FID signal,自由感应衰减信号

free oscillating period,自由振动周期

free swing of pendulum,摆锤空击

free vehicle respirometer,活动式海底生物呼吸测量器

free vibration,自由振动

freezing heat,凝固热

freezing point,凝固点

frequency,频率

frequency-amplitude characteristic,幅频特性

frequency analysis,频率分析

frequency analyzer,频率分析仪

frequency band,频带

frequency distrbution,频率分布

frequency division multiplexing,频分多路传输

frequency domain,频域

frequency domain analysis,频域分析

frequency domain method,频域法

frequency domain model reduction method,频域模型降价法

frequency index,频率指数

frequency measurement by comparison with time scale,时标比较法测频