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                                                地震检波器假频检测的方法

                                                  方法介绍:

                                                地震检波器假频检测的方法包括:将标准加速度传感器与被测地震检波器同时固定在振动台上,并使两传感器的轴向和振动台的主振方向垂直;采集标准加速度传感器和被测地震检波器的输出电压波形,并计算得到由于振动台横向振动引起的检波器输出电压波形;用被测地震检波器的实际输出电压波形减去由于振动台横向振动引起的输出电压波形,计算其幅值后,再除以当前时刻振动台主振方向的速度幅值,所得的商为被测地震检波器的横向灵敏度;由低频到高频逐点激励地震检波器,得到横向幅频特性曲线,曲线的峰值对应的频点即为被测地震检波器的假频。本发明具有能够利用普通振动台即可******测得地震检波器假频的优点。 

                                                  方法:
                                                  假频测试可以应用如下检波器:

                                                Type

                                                LGT-20D4.5

                                                LGT-20D10

                                                LGT-20D14

                                                LGT-20D28

                                                Natural Frequency (Hz)

                                                4.5 ± 0.5

                                                10 ± 5%

                                                14 ± 5%

                                                28 ± 5%

                                                Open Circuit Damping

                                                0.6 ± 5%

                                                0.3 ± 5%

                                                0.22 ± 5%

                                                0.27 ± 5%

                                                Damping with Shunt Resistance

                                                 

                                                0.7 ± 5%

                                                0.51 ± 5%

                                                0.552 ± 5%

                                                Intrinsic Voltage Sensitivity (V/cm/s)

                                                0.288± 5%

                                                0.28 ± 5%

                                                0.28 ± 5%

                                                0.39 ± 5%

                                                Sensitivity with Shunt Resistance(V/cm/s)

                                                 

                                                0.2 ± 5%

                                                0.2 ± 5%

                                                0.28 ± 5%

                                                Coil Resistance

                                                375 ± 5%

                                                395 ± 5%

                                                395 ± 5%

                                                395 ± 5%

                                                Close Circuit Resistance (Ω)

                                                 

                                                283 ± 5%

                                                283 ± 5%

                                                283 ± 5%

                                                Harmonic Distortion 

                                                ≤0.6%

                                                ≤0.2%

                                                ≤0.2%

                                                ≤0.2%

                                                Typical Spurious Frequency (Hz)

                                                ≥150

                                                ≥250

                                                ≥250

                                                ≥350

                                                Moving Mass (g)

                                                11.3

                                                11

                                                11

                                                11

                                                Coil Excursion P-P

                                                4.0

                                                1.5

                                                1.5

                                                1.5

                                                Maintains Fn Specifications to Tilt Angle 

                                                ≤10

                                                ≤20

                                                ≤20

                                                90

                                                Core Unit Diameter (mm)

                                                25.4

                                                25.4

                                                25.4

                                                27

                                                Core Unit Height (mm)

                                                36

                                                33.5

                                                33.5

                                                33.5

                                                Core Unit Mass (g)

                                                81

                                                87

                                                87

                                                100

                                                Operating Temperature()

                                                -40 to +90

                                                -40 to +90

                                                -40 to +90

                                                -40 to +90

                                                Warranty (year)

                                                1

                                                3

                                                3

                                                3

                                                 

                                                Type

                                                LGT-20D40

                                                LGT-20D60

                                                LGT-20D100

                                                Natural Frequency(Hz)

                                                40 ± 5%

                                                60±5%

                                                100 ± 5%

                                                Open Circuit Damping

                                                0.37 ± 5%

                                                0.503±5%

                                                0.464 ± 5%

                                                Damping with Shunt Resistance

                                                0.576 ± 5%

                                                0.60±5%

                                                0.65 ± 5% (1500 Ω)

                                                Intrinsic Voltage Sensitivity(V/cm/s)

                                                0.42 ± 5%

                                                0.39±5%

                                                0.612 ± 5%

                                                Sensitivity with Shunt Resistance (V/cm/s)

                                                0.304 ± 5% (1500)

                                                0.27±5% (2000)

                                                0.32 ± 5% (1500 Ω)

                                                Close Circuit Resistance (Ω)

                                                 

                                                 

                                                 

                                                Coil Resistance (Ω)

                                                575 ± 5%

                                                668±5%

                                                808± 5% 

                                                Distortion (%)

                                                ≤0.2

                                                0.2

                                                0.2

                                                Typical Spurious Frequency (Hz)

                                                ≥400

                                                 ≥550

                                                ≥ 600

                                                Moving Mass (g)

                                                8.2

                                                6.5

                                                7.6

                                                Coil Excursion P-P (mm)

                                                1.5

                                                1.5

                                                1.5

                                                Maintains Fn Specifications to Tilt Angle

                                                90

                                                90°

                                                90°

                                                Core Unit Diameter (mm)

                                                27

                                                27

                                                27

                                                Core Unit Height (mm, )

                                                33.5

                                                33.5

                                                33.5

                                                Core Unit Mass (g)

                                                100

                                                98

                                                98

                                                Operating Temperature()

                                                -40 to +90

                                                -40 to +90

                                                -40 to +90

                                                Warranty(year)

                                                3

                                                2

                                                2

                                                 

                                                *Longet Equipment Co., Ltd can customize different kind of seismic geophones to meet all the customer's various applications.

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