object plane,物面

object program,目标程序

object wave,物体声束

objective evidence,客观证据

objective lens of the scanning electron microscope,扫描电子显微镜物镜

objective lens of the transmission electron microscope,透射电子显微镜物镜

oblique visibility,斜能见度

observability,可观测性；能观测性

observation and recording device,观察和记录装置

ocean bottom seismograph,海底地震仪

ocean date station,浮标站

oceanographic geological instrument,海洋地质仪器

oceanographic instrumentation,海洋仪器

oceanographic measuring system,海洋测量系统

oceanographic observation,海洋观测

oceanographic survey,海洋调查

octave,倍频程

octave(bandwidth)filter,倍频程（宽带）滤波器

octave filter set,倍频程滤波器组

odd-even check,奇偶校验

off-axis response,离轴响应

off-line,离线

off-line processing,离线处理；脱机处理

off-line system simulation,离线系统仿真

office automation (OA),办公自动化

office automation system (OAS),办公自动化系统

office information system (OIS),办公信息系统

officially recognized standard,官方认可标准

offset,静差

offset coefficient,静差系数

oil-filled enclosure (Ex o),充油外壳（Ex o）

oil-water meter,原油水分仪

omegatron mass spectrometer,回旋质谱计

omnidirectional microphone,全向传声器

on-cold column injector,冷柱头进样器

one-dimensional location,线定位；一维空间定位

on-line,在线

on-line assistence,在线帮助

on-line measurement and frequency spectrum analysis,在线测量频谱分析

on-line process gas chromatograph,在线过程气相色谱仪

on-line processing,在线处理；联机处理

on-line real-time processing,在线实时处理

on-line real-time system,联机实时系统

on-line system simulation,在线系统仿真

on-off action,通断作用

on-off controller,通断控制器

one-man atmospheric submersible,常人常压潜水器

one-third octave filter,1/3倍频程滤波器

one-turm time of output shaft,输出轴每转时间

one-way communication,单向通信

open-circuit intermediate voltage,开路中间电压

open front case with pressure relief,带泄压装置的前开式外壳

open front case without pressure relief,无泄压装置的前开式外壳

(open hole) caliper,井径仪

open-jet wind tunnel,开口式风洞

open loop,开环

open loop control,开环控制

open loop control system,开环控制系统

open loop electronic balance,开环式电子天平

open-loop frequency response,开环频率响应

open-loop gain,开环增益

open-loop gain characteristic,开环增益特性

open loop pole,开环极点

open loop process control,开环过程控制

open loop remote control system,开环遥测控制系统

open loop stabilization,开环稳定

open loop transfer function,开环传递函数

open loop voltage gain,开环电压增益

open loop zero,开环零点

open source,裸式离子源

open system,开放系统；开环系统

open system interconnection (OSI),开放系统互连

open tubular column,空心柱

opening valve time,开阀时间

operating conditions,工作条件

operating error,工作误差

operating infulence,工作条件影响

operating limits,极限工作条件

operating period,工作周期

operating pressure differential,工作压差

operating system (OS),操作系统

operating temperature range,工作温度范围

operating time,工作时间

operational amplifier,运算放大器

operational reliability,运行可靠性

operational research model,运筹学模型

operational unit,运算器

operations research,运筹学

operative limits,极限工作条件

operator,操作员

operator command,操作员命令

operator's console,操作员操纵台

operator's station,操作员站

optic fiber displacement meter,光纤式位移计

optic fiber position measuring instrument,光纤式位置测量仪

optic fiber pressure transducer,光纤压力传感器

optic fiber tachometer,光纤式转速表

optic fiber tachometric transducer,光纤式转速传感器

optical arm length,光臂长度

optical Doppler effect,光的多普勒效应

optical fiber,光导纤维

optical fiber chemical sensor,光纤化学传感器

optical fibre magnetometer,光纤磁强计

optical fiber sensor,光纤式传感器

optical(measurement)method,光测法

optical micrometer,光学测微器

optical plummet,垂准仪；光学对中器

optical pumping,magnetometer,光泵磁强计；光泵磁力仪

optical(quantity)transducer(sensor),光（学量）传感器

optical reading range,光学读数范围

optical spectrometer,光学光谱仪

optical system,光学系统

optical theodolite,光学经纬仪

optical vibrometer,光学测振仪

optical wedge micrometer,光楔测微器

optima estimation,最优估计

optimal control,最优控制

optimal control law,最优控制律

optimal control system,最优控制系统

optimal control theory,最优控制理论

optimal decision problem,最优决策问题

optimal solution,最优解

optimal strategy,最做出策略

optimality principle,最优性原理

optimization,（最）优化

optimization layer,优化层

optimization technique,最优化技术

optimum frequency,最佳频率

order,有序

order parameter,序参数

ordinary temperature thermistor,常温热敏电阻器

organic semiconductor gas transducer [sensor],有机半导体气体传感器

organic semiconductor humidity transduce [sensor],有机半导体湿度传感器

organic semiconductor thermistor,有机半导体热敏电阻器

orientation,定向

orientation control,定向控制

orifice,节流孔

orifice plate,孔板

orifice-and-plug flowmeter,锥塞式流量计

original system,原系统

originator,源发站

orthogonal distrortion,正交畸变

ortho-projector,正射投影仪

oscillating period,振荡周期

oscillator,振荡器

oscillograph,录（示）波器

oscillographic polarograph,示波极谱仪

oscilloscope,示波器

outboard rotor,外重心转子

outdoor location,户外场所

outer package,外包装

outlier,剔除值

output device,输出单元；输出设备

output equation,输出方程

output error,输出误差

output feedback,输出反馈

output fluctuation,输出波动

output force or torque stability,输出激振力或力矩的稳定性

output impedance,输出阻抗

output impedance of microphone,传声器输出阻抗

output information,输出信息

output matrix,输出矩阵

output noise,输出噪声

output prediction method,输出预估法

output shaft rotation clearance,输出轴间隙角

output shaft rotation range,输出轴转角范围

output shaft torque,输出轴转矩

output signal,输出信号

output signal "one" level,输出信号“1”电平

output signal "zero" level,输出信号“0”电平

output state,输出状态

output stem travel clearance,输出杆间隙位移

output system,输出系统

output unit,输出设备

output variable,输出变量

output vector,输出向量；输出矢量

oval gear flowmeter,椭圆齿轮流量计

oval wheel flowmeter,椭圆齿轮流量计

oven temperature,箱温

over-current protection,过电流保护

over-voltage protection,过电压保护

overall design,总体设计

overdampin,非周期阻尼；过阻尼

overflow,溢出

overflow indication,溢出指示

overlapping averages,滑动平均

overlapping event,交迭事件

overload,过载；超负荷

overload flow-rate,过载流量

over-load meter,过载仪

overpressure characteristic,超压特性

overpressure failure,超压破裂

overrange,过范围

overrange limit,过范围限

overshoot,过冲；超调量；过振比

overview panel,总貌画面

overvoltage protection varistor,过电压保护电压敏电阻器

oxide thermistor,氧化物热敏电阻器

oxygen bomb,氧弹

oxygen bomb calorimeter,氧弹式热量计

oxygen (pressure)gauge,氧压力表

oxygen regulator,氧气减压器

ozone analyzer,臭氧分析仪

ozone sonde,臭氧探空仪