optical e-field sensors perform signal measurement including accurate measurement of electric field intensity distribution and broadband frequency, which were not possible under conventional methods. in addition to applications mostly in research and product development, optical e-field sensors are used for identifying and resolving the causes of emc problems.



please refer to the next page for more information.

the oefs provides extremely accurate measurements of e-field strength distribution /signals, including wideband frequencies. this is possible because the technology uses almost no metal, lithium niobate wafers, an optical signal, and a measuring principle called "pockels effect", so the sensor is electrically "invisible" during measurements. the main uses of this instrument are for " research and development" and "investigation/measurements" of various emi related issues. now, major cost reductions can be achieved becaue the oefs validates various theories and simulated models of emc design during the design and modeling phase, both internal and external of the eut.

e-field strength distribution measurementst in the cabin of a car.

horiuchi et al., : comparisons of simulated and measured electric field distributions :icice trans.commun., vol.e90-b. no.9 september 2007

esd e-field waveform measurement(air discharge)

e-field strength distribution measurements in a microwave

fukushima : electromagneticanalysis and electric field intensity distributions in microwave oven., jemea symposium 2010

mimo antenna pattern measurements

mimo(2ch) antenna phase caracteristics

◆standard goods
・isotropic e‐field sensor head: measurements of the orthogonal 3 axis e‐field component.

sh‐03ex isotropic e‐field sensor head(high sensitivity type)

item specification
frequency 100k~3ghz
e-field strength 0.002~100v/m
isotropy ±1db typ.
size φ30㎜×90㎜
material foam


sh‐10ex isotropic e‐field sensor head(broadband type)

item specification
frequency 100k~10ghz
e-field strength 0.01~500v/m
isotropy ±1db typ.
size φ40㎜×90㎜
material form


・optical probe head:passively receives rf power from small antennas and modulates the rf into an optical signal.
item model specification
frequency ph-0255 300k~2ghz
ph-0455m 300k~4ghz
ph-0655 300k~6ghz
loss ph-0255 5db±5db typ.
ph-0455m 10db±5db typ.
ph-0655 15db±5db typ.
size(metal parts) 10x10x20mm


◆customized sensors

we welcome unique applications and requirements. custom specifications can be determined based on requirements.

・sh‐10el miniaturized isotropic e‐field sensor head

this is the isotropic optical e‐field sensor head for high e‐field measurements such as inside of the microwave

item specification
frequency 100k~10ghz
e-field strength※ 0.5~25000v/m
isotropy ±0.5db typ.
size φ12㎜×80㎜
material abs

※long period, high power cw radiation can damage the sensor.

・nld(noiseleak detector) head
ultra‐compact 1‐axis optical e‐field sensor head.

e‐field measurements in narrow/small spaces, such as inside a metal enclosure.




frequency 100k~10ghz
e-field strength※ cs-1403 0.5~25,000v/m
cs-1210 0.01~500v/m
size 6x6x24mm
material acrylic resin

※long period, high power cw radiation can damage the sensor.

・optical voltage probe‐

because there is no currents or voltages used in the probes, exact waveforms can be measured . additionally, the probes can be used on circuit boards during esd testing, so actual waveforms can be witnessed and esd can be traced through a system.