The present invention aims to present an angular velocity sensor having a self diagnosis function. An angular velocity sensor of the present invention includes a driving part for stably vibrating a driving part of a sensor element having a driver part and a detector part for detecting an angular velocity and detection means for detecting the angular velocity of the sensor element and obtains a self diagnosis signal for a malfunction by detecting a mechanical coupling signal obtained at the detection means.

Angular velocity sensor

New sensors and methods for qualitative and quantitative analysis of multiple gaseous substances simultaneously with both high selectivity and high sensitivity are provided. The new sensors rely on a characteristic difference in energy between the interaction of a particular substance with a catalyst coated heat transfer device (HTD) (5) (figure 1A) and a non-catalyst coated (or one coated with a different catalyst) reference HTD (10) (figure 1B). Molecular detection is achieved by an exothermic or endothermic chemical or physical reaction between the catalytic surface of the sensor and the molecule, tending to induce a temperature change of the sensor. Both high temperature and non-destructive low temperature detection are possible. The magnitude and rate of endothermic or exothermic heat transfer from a specific molecule-catalyst interaction is related to molecular concentration.

Sensor device and method for qualitative and quantitative analysis of gas phase substances

A capacity(ies) of a variable capacitor(s) varies with a physical amount. A C-V conversion circuit converts variation in the capacity into a voltage signal. First and second charge holding circuits hold the voltage signal at different timings as first and second charges, respectively. An offset compensating charge holding circuit generates and holds an offset charge for compensation of an offset in the voltage signal. A charge combining and holding circuit combines and holds the first and second charges and the offset charge. An outputting circuit receives the combined charge from the charge combining and holding circuit and outputs an output voltage signal corresponding to the physical amount in accordance with the received charge. The outputting circuit, the offset compensating charge holding circuit, the C=V circuit may be omitted. The variable capacitance may include a capacitor or a differential type capacitors.

Signal processing apparatus

A method for operating a metal detection system that comprises a balanced coil system. One embodiment of the method comprises: determining the phase and magnitude of related signals at least for a first metal contaminant for at least two transmitter frequencies and for at least two particle sizes of the first metal contaminant; determining the phase and magnitude of the related signal for a specific product for the at least two transmitter frequencies; comparing information established at least for the first metal contaminant and the information established for the product; determining a transmitter frequency with which signal components of smallest sized particles of the at least first metal contaminant differ sufficiently or most in phase and amplitude from the phase and amplitude of the product signal; and selecting the transmitter frequency for measuring the product. A metal detection apparatus adapted to operate according to an exemplary method is also provided.

Method for operating a metal detection system and metal detection system

PROBLEM TO BE SOLVED: To provide a compact and highly sensitive pressure detector capable of always accurately detecting an external pressure without causing any electric short circuit between capacitance electrodes. SOLUTION: This package for the presser detector is provided with an insulated base body 1 for mounting a semiconductor element 3 on one main face, a plurality of wiring conductors 5 arranged in the insulated base body 1 for electrically connecting electrodes of the semiconductor element 3, an insulating board 2 connected to the insulated base body 1 flexibly for forming a substantially disc-shaped sealed space between the other main face of the insulated base body 1 and itself, capacitance formation first electrode 7 installed to the other main face of the insulated base body 1 and electrically connected one conductor 5a in the wiring conductors 5, and a capacitance formation second electrode 8 installed to the inside main face of the insulating board 2 opposedly to the first electrode 7 and electrically connected to the other wiring conductor 5b of the wiring conductors 5. The surface of the first electrode 7 or the second electrode 8 is covered with an insulating film 9. COPYRIGHT: (C)2003,JPO

Package for pressure detector

PURPOSE:To measure 3 components in the magnetic field measurement and 2 components in the electric field measurement simultaneously by switching extremely low, ultra low and very low frequency band amplification circuits with one measuring device. CONSTITUTION:Regarding a magnetic field, an induction output of a magnetic sensor 1' is obtained as cleared of a noise frequency through a differential amplification circuit 1, a notch filter 2 and an attenuation circuit 3. When this output is amplified, VLF (very low frequency), ELF (extremely low frequency) and ULF (ultra low frequency) amplification circuts 4, 5 and 6 are changed over with a selector switch 16 and outputs of the circuits 4-6 are changed over with a selector switch 16' interlocking the switch 16. Then, waveform thereof is observed via a buffer circuit 15. Outputs of the circuits 4-6 are inputted into VLF, ULF and ELF BPF7-9, outputs of which are changed over with a selector switch 16'' interlocking the switch 16 and provided to a display circuit via a rectification circuit 10, an LPF11 and a DC amplification circuit 12. In this circuitry, sensors are provided for the magnetic field in three directions, two on the plane parallel with the ground surface and one vertical thereto and for the electric field in two directions on the plane to enable a simultaneous measurement.

Specific resistance measuring apparatus for earth's crust

PURPOSE: To reduce the error caused by a temperature drift in an electrostatic capacity sensor CONSTITUTION: A switched capacitor circuit 12 converts the ratio between the detection electrostatic capacity and reference electrostatic capacity into a voltage The reference potential applied to the switched capacitor circuit 12 is switched by switching transistors 10, 11 driven by the drive signal The switching transistor of the switched capacitor circuit 12 is applied with the reset signal having the frequency 1/2 times that of the drive signal, and the switched capacitor circuit 12 is applied with the clock signal having the same frequency as that of the drive signal The output of the switched capacitor circuit 12 is sample-held at every phase difference 90 deg against the clock signal, and the sample hold value is added or subtracted

Detecting circuit for electrostatic capacity type sensor

PURPOSE:To constitute a titled detector so that the external magnetic field has a wide and high accuracy linear characteristic, extending from the vicinity of zero to a magnetic field of a bridge balance point of a detecting circuit, by incorpoating a correcting circuit by which an output to the external magnetic field has the linear characteristic, in the poststage side of the detecting circuit. CONSTITUTION:A coil having a high permeability magnetic material as a magnetic core is connected in series to a position relation in which an X axis, a Y axis and a Z axis are orthogonal to each other. In this case, the coils whose inductance and variation of the inductance to the external magnetic field become the same, respectively, are used. Subsequently, when the external magnetic field is applied from some direction to a magnetic sensor having such a constitution, a variation of the total inductance LT in case each coil is connected in series is proportional to a square of the external magnetic field Hex. That which has fetched a variation of this total inductance LT as a detecting output of a Wheatstone bridge circuit is corrected by inputting the detecting output to a correcting circuit 5, so that an output of its correcting circuit becomes linear to the external magnetic field.

Three axes system magnetic detector

PROBLEM TO BE SOLVED: To provide a detection circuit for small, high sensitivity angular speed sensor in which excellent temperature characteristics are sustained regardless of the temperature characteristics of device output or parasitic capacity. SOLUTION: The detection circuit for angular speed sensor comprises a common switched capacitor circuit 3 connected with a pair of oscillators and applying arbitrary AC voltages or pulse voltages independently to an exciting circuit 1 and a detection drive circuit 2, a sample hold circuit 4 for holding the output signal from the switched capacitor circuit 3 at more than one different sampling timing and outputting as sample signals, and a compensation capacitor Cd3 having electric capacitance substantially equal to the sum of electric capacitance of exciting capacitors Cd1 , Cd2 in the exciting circuit 1 and applying AC voltages or pulse voltages from the detection drive circuit 2 to the exciting capacitors Cd1 , Cd2 while shifting the phase by 180 deg. from that of the exciting capacitors Cd1 , Cd2 .

Detection circuit for angular speed sensor

PURPOSE:To allow highly accurate measurement by exposing one of two inductance elements, each employing a metal oxide film having permeability variable with temperature, to an atmosphere to be measured and detecting the quantity of heat to be removed based on the difference of inductance. CONSTITUTION:Heat-sensitive inductance elements 1, 2 are fed with an AC exciting voltage and a voltage is applied to heaters in the elements 1, 2. Thermal conduction acts on the element 1 through steam in the atmosphere flowing into a sensor through a vent 3 to accelerate heat dissipation thus lowering the ambient temperature of the element 1. Consequently, initial permeability of magnetic metal oxide employed in the element 1 decreases thus decreasing the inductance of the element 1 correspondingly. On the other hand, the element 2 is enclosed and thermal conduction through steam in the atmosphere does not act thereon and thereby the temperature does not vary. Consequently, the inductance is differentiated between the elements 1 and 2 and the difference is taken out as an output voltage from a bridge circuit.

Tsuruga Kikuo

Papers

Specific resistance measuring apparatus for earth's crust

Detecting circuit for electrostatic capacity type sensor

Three axes system magnetic detector

Detection circuit for angular speed sensor

Heat removing atmospheric detector and atmospheric sensor therefor