487results about "Weighing apparatus using counterbalance" patented technology

A test battery method and system (10, 100, 200, 225) for use in assessing auditory function (e.g., the screening or diagnosis of impairments, fitting of hearing aids, etc.) is provided which performs one or more auditory tests including, for example, an acoustic reflectance test. Such an acoustic reflectance test may be a reflectance tympanometry test that includes a feedback system to control static pressure in the ear canal. Such acoustic reflectance tests may be used alone or in combination with one or more other auditory tests. Further, for example, such a battery of tests may include middle-ear muscle reflex tests in combination with one or more other auditory or hearing tests.

An implantable pedometer for measuring the amount of joint use is disclosed. The implantable pedometer includes a sensor adapted for detecting indicators of joint usage. A counter is configured for storing count data corresponding to the number of indicators detected by the sensor and a telemetry circuit is configured for transmitting the count data outside of the body.

In industrial sensing applications at least one parameter of at least one fluid in a pipe 12 is measured using a spatial array of acoustic pressure sensors 14,16,18 placed at predetermined axial locations x1, x2, x3 along the pipe 12. The pressure sensors 14,16,18 provide acoustic pressure signals P₁(t), P₂(t), P₃(t) on lines 20,22,24 which are provided to signal processing logic 60 which determines the speed of sound a_mix of the fluid (or mixture) in the pipe 12 using acoustic spatial array signal processing techniques with the direction of propagation of the acoustic signals along the longitudinal axis of the pipe 12. Numerous spatial array-processing techniques may be employed to determine the speed of sound a_mix. The speed of sound a_mix is provided to logic 48, which calculates the percent composition of the mixture, e.g., water fraction, or any other parameter of the mixture, or fluid, which is related to the sound speed a_mix. The logic 60 may also determine the Mach number Mx of the fluid. The acoustic pressure signals P₁(t), P₂(t), P₃(t) measured are lower frequency (and longer wavelength) signals than those used for ultrasonic flow meters, and thus is more tolerant to inhomogeneities in the flow. No external source is required and thus may operate using passive listening. The invention will work with arbitrary sensor spacing and with as few as two sensors if certain information is known about the acoustic properties of the system. The sensor may also be combined with an instrument, an opto-electronic converter and a controller in an industrial process control system.

A light source unit includes a light source having LED chips for emitting different colors of light and an optical sensor for detecting light from a light mixer. A light source control section controls by feedback control luminance of each of the LED chips according to values detected by the optical sensor. The light source unit also includes a temperature control section for controlling the temperature of the light source. The temperature control section is a feedback control system. Keeping the light source at a constant temperature allows suppressing spectrum changes of the LED chips with temperature, thereby suppressing changes in the luminance and chromaticity of the light source unit.

Graphene layers, hexagonal boron nitride (hBN) layers, as well as other materials made of primarily sp2 bonded atoms and associated methods are disclosed. In one aspect, the present invention provides graphene and hBN devices. In one aspect, for example, an electronic device is provided including a graphene layer and a planar hBN layer operably associated with the graphene layer and forming a functional interface therebetween. Numerous functional interfaces are contemplated, depending on the desired functionality of the device.

At least one exemplary embodiment is directed to a method of monitoring hearing health comprising: measuring a first acoustic sound pressure level due to an ambient audio signal; measuring a second acoustic sound pressure level due to an emitted audio signal from a speaker; calculating a total sound pressure level dosage, where the total sound pressure level dosage is calculated using the first acoustic sound pressure level and a first time span, and the second acoustic sound pressure level and a second time span associated, where the first time span is the time associated with the measured first acoustic sound pressure level and second time span is the time associated with the measured second acoustic sound pressure level; and sending a notification signal when total sound pressure level dosage is greater than a threshold value.

At least one exemplary embodiment is directed to a system for monitoring a sound pressure level dose at an ear which includes an audio transducer adapted to be placed within an ear to receive sound at the ear. The audio transducer outputs a sound signal. A sound level threshold detector receives the sound signal and determines whether a sound pressure level of the sound signal is at a minimum level and outputs a sound pressure level signal corresponding to a sound pressure level of the sound pressure level when the sound pressure level is not at the minimum level. A clock calculates a time period during which the sound pressure level is not at the minimum threshold level. A listening fatigue calculator receives the sound signal and the time period and determines whether a cumulative effect of exposure to the sound at the ear over a monitored time period will cause harm to the ear. At least a portion of the system is disposed in situ at the ear.

Certain embodiments of the invention may be found in an ultra low power dosimeter assembly. The ultra low power dosimeter assembly may comprise a low power voltage source and a table circuit. The table circuit may be adapted to convert an input voltage to a second voltage level. The second voltage level may correspond to noise dose. The ultra low power dosimeter assembly may also comprise a switch adapted to trigger a control circuit. The control circuit may provide progressive attenuation of an output signal as the second voltage level increases. In certain embodiments, the control circuit may also be adapted to send one or more warning signals to a user of the ultra low power dosimeter. The one or more warning signals may be sent when the control circuit determines the second voltage level has reached one or more pre-determined threshold voltage levels.

PCT No. PCT/DE97/01266 Sec. 371 Date Jan. 29, 1999 Sec. 102(e) Date Jan. 29, 1999 PCT Filed Jun. 20, 1997 PCT Pub. No. WO98/00688 PCT Pub. Date Jan. 8, 1998A support base for a measuring cell including a base plate with a bore and an annular groove defined therein, and a planar pressure surface machined therein. A load pin is connected to the base plate to provide articulated support for a load. The load pin has a threaded shank adaptable to adjust its height relative to the measuring cell and terminates in a pressure head with a convex pressure surface and an annular groove defined therein. The pressure head of the load pin is inserted with play into the bore of said base plate. A resilient ring is disposed between the annular grooves to connect the base plate and the pressure head.

Methods and devices for the formation of droplets of a first fluid in a second fluid and the encapsulation of particles or cells within such droplets are disclosed. Impetus for droplet formation is provided by the creation of a transient bubble, which may be induced using a pulsed laser. Droplet volume and the frequency at which droplets are formed can be controlled by modulation of the pulsed laser. The disclosed methods and devices are particularly suitable for use in microfluidic devices.

An ultrasonic field-portable system for accurately measuring hematocrit (HCT) and hemoglobin concentration (HGB) in small food samples. The system includes an analyzer (10) that allows extremely accurate measurements of blood hematocrit from only one or two drops of +>>d collected in a disposable sampling device (12) that is then inserted into the analyzer (10). The system is compact enough to package into a point of care device, making it a point of care device with accuracy comparable to larger CBC lab equipment.

A system for monitoring sound pressure levels at the ear includes an ambient sound microphone (ASM) for receiving ambient sounds and an ear canal microphone (ECM) for producing audio signals as a function of ambient sound received at the ambient sound microphone and sound signal received from an associated personal audio device. A logic circuit is operatively associated with the ASM and ECM calculates a total SPL_Dose experienced by the ear at a time t. In one exemplary embodiment, the total SPL_Dose is calculated by determining SPL_Dose for periods Δt as measured at the ECM. The logic circuit then may then select an action parameter in response to the Total SPL_Dose.

A noise dosimeter with capability to rapidly predict noise exposure over an extended time period based on a measurement of short duration. Either an acoustic or an electrical earphone adapter provides a convenient means to connect the noise dosimeter to an external sound source. A direct input jack operable to receive at least one audio signal provides a signal to an RMS detector, which provides a DC signal to a two-stage amplifier circuit. The outputs of the amplifiers are provided to a processor having multiple A/D channels. The processor calculates accumulated noise doses and drives a display, which in one embodiment includes a panel of light-emitting diodes. In one embodiment, the dosimeter includes functionality for control of external devices such as sound boards.

A method for determining a shear modulus of an elastic material with a known density value is provided. In this method, a spatially modulated acoustic radiation force is used to initially generate a disturbance of known spatial frequency or wavelength. The propagation of this initial displacement as a shear wave is measured using ultrasound tracking methods. A temporal frequency is determined based on the shear wave. The shear modulus of the elastic material at the point of excitation may be calculated using the values of the spatial wavelength, material density, and temporal frequency.

An acoustic system has an acoustic sensor and a processing circuit. The acoustic sensor includes a base, a microphone having a microphone diaphragm supported by the base, and a hot-wire anemometer having a set of hot-wire extending members supported by the base. The set of hot-wire extending members defines a plane which is substantially parallel to the microphone diaphragm. The processing circuit receives a sound and wind pressure signal from the microphone and a wind velocity signal from the hot-wire anemometer, and provides an output signal based on the sound and wind pressure signal from the microphone and the wind velocity signal from the hot-wire anemometer (e.g., accurate sound with wind noise removed). The configuration of the hot-wire extending members defining a plane which is substantially parallel to the microphone diaphragm can be easily implemented in a MEMS device making the configuration suitable for miniaturized applications.

A method of indicating a medium jam along a medium transport path comprising one or more rollers for use in conveying the medium along the medium transport path; a microphone for detecting the sound of the medium being conveyed and producing a signal representing the sound; a processor for producing sound values from the signal and computing a moving window sum responsive to the sound values; computing a high amplitude count responsive to the sound values; and computing a post roller sum responsive to the sound values; and indicating the medium jam responsive to the moving window sum, high amplitude count, or post roller sum.

Method and apparatus for simultaneous acoustic measurement at a point (M) in space of the three components of the sound intensity vector. A preferred omnidirectional vector probe (40) includes a central ring (42) with four small, microphones on tubes attached to the ring spaced from one another in a regular tetrahedral arrangement. The tubes are parallel to the axis of the ring, two on one side (58) and two on the reverse side (60) of the ring, with two of the microphones pointing in one direction and two in the opposite direction. The microphone signals are processed by an analog-to-digital converter feeding a digital signal processor (68) and employing a cross-spectral formulation to compute a sound intensity vector at the measurement point (M). Sound velocity and pressure can also be determined at this point. The resulting data may be outputted on a computer screen or other device (70). Additional related features and methods are disclosed.

A capacitance sensor has a substrate, a vibration electrode plate formed over an upper side of the substrate, a back plate formed over the upper side of the substrate to cover the vibration electrode plate, and a fixed electrode plate arranged on the back plate facing the vibration electrode plate. At least one of the vibration electrode plate and the fixed electrode plate is divided into a plurality of regions. A sensing unit configured by the vibration electrode plate and the fixed electrode plate is formed in each of the divided regions. The plurality of sensing units output a plurality of signals having different sensitivities. At least some sensing units of the sensing units have vibration electrode plates having areas different from the areas of the vibration electrode plates in the other sensing units.