228 results about "Attenuation ratio" patented technology

An apparatus for determining concentrations of hemoglobins includes a light source for emitting lights of at least three different wavelengths, a first wavelength in a near-infrared region, a second wavelength in a red region, and a third wavelength in a red orange region, light receiving device for receiving light emitted by the light source, transmitted through a living tissue or reflected by the living tissue, attenuation ratio processing device for processing attenuation ratios between the wavelengths in accordance with variations of received-light output signals in each of the wavelengths output from the light receiving device, the variations are caused by a pulsation of blood and concentration ratio processing device for processing concentration ratios of at least oxyhemoglobin and methemoglobin based on the output signals from the attenuation ratio processing device.

A step attenuator apparatus is provided, having an attenuation ratio which is switchable according to a control signal. Multiple variable attenuators are connected in series. Each variable attenuator includes a first terminal, a second terminal, multiple paths having different attenuation ratios, a first switch that can be connected to one end of a desired path selected from among the multiple paths, and a second switch that can be connected to the other end of a desired path selected from among the multiple paths. When a control signal is an instruction to set the step attenuator apparatus to a disconnected state, a control unit connects the first switch of the first-stage variable attenuator to one of the multiple paths, and connects the second switch of the first-stage variable attenuator to a different one of the multiple paths.

The invention provides a system (2) for non-invasive detection of the state of hydration in a living specimen, the system including an RF generator/transmitter (416) for emitting RF radiation signals and for transmitting the radiation signals through a tissue of a living specimen; an RF receiver (8) for receiving RF signals transmitted through the tissue, and for feeding the signals to a processor (10) for comparison of relative attenuation of RF frequencies passing through the tissue with a reference attenuation ratio signal, and an indicator unit (12) for providing an output signal representative of the water content level of the tissue. A method for non-invasive detection of the state of hydration in a living specimen is also described and claimed.

The invention discloses a method for detecting the actual capacity of a battery, which comprises the following steps: (A1) measuring discharge quantity in the battery discharge process, and recording the discharge quantity when the battery voltage is reduced to a set threshold; (A2) setting the initial value of battery attenuation ratio as 100%, and multiplying the battery attenuation ratio by the ratio of the discharge quality this time to the discharge quantity last time after discharge from the recorded second discharge, thus obtaining the corrected battery attenuation ratio; and (A3) multiplying the nominal capacity of the battery by the newly corrected battery attenuation ratio, thus obtaining the actual capacity of the battery. The invention also discloses methods for detecting the residual capacity, the residual standby time and the health condition of a battery based on the method for detecting the actual capacity of a battery. By using the methods disclosed by the invention, the service condition and health state of the battery can be accurately obtained.

A PWM controller having frequency jitter includes a modulator for generating a first jitter current and a second jitter current. An oscillator generates a pulse signal for producing a switching frequency in response to the modulation of the first jitter current. An attenuator is connected in a voltage feedback loop for attenuating a feedback signal to an attenuated feedback signal, in which the attenuated feedback signal is utilized to control an on-time of a switching signal. A variable-resistance circuit is connected with the attenuator for programming an attenuation rate of the attenuator in response to the modulation of the second jitter current. The switching frequency increases whenever the first jitter current increases. Meanwhile, the impedance of the attenuator will decreases and the attenuation rate will increase whenever the second jitter current increase. The on-time of the switching signal is thus immediately reduced, which compensates the decrease of the switching period and keeps the output power as a constant.

The invention discloses an RCD (Residual Current Device) detection device. A detection circuit in the detection device can generate a simulation drain current on the basis of a first control signal output by a controller, and the processed simulation drain current is output to the controller, a differential current transformer can output a drain current obtained in the detection to a signal processing unit which can process and output the drain current to the controller, a trip circuit can generate a simulation voltage based on a second control signal output by the controller and can output the simulation voltage to the controller and a tripping device, and the controller can determine whether the differential current transformer and/or the signal processing unit has faults or not according to the comparison results of the simulation drain current and the drain current, and determine whether the trip circuit and/or the tripping device has faults or not according to the comparison results of the attenuation ratio of the simulation voltage with a preset attenuation ratio, cue signals denoting the detection results can be output to a detection result cue unit, and the detection result cue unit can output the detection results according to the obtained cue signals. The invention further discloses an RCD detection method. By adopting the RCD detection device and the detection method provided by the invention, an RCD (Residual Current Device) can be detected in the case of the connection of a circuit breaker with a power grid.

The invention discloses a composite of graphene and a conducting polymer. The composite comprises a base body; a graphene layer and a conducting polymer layer are arranged in sequence on the surface of the base body, or the conducting polymer layer and the graphene layer are arranged in sequence on the surface of he base body. A preparation method of the composite comprises the following steps: transferring the graphene onto the surface of the base body first, then coating the graphene with the conducting polymer; or coating the surface of the base body with the conducting polymer first, then transferring the graphene onto the conducting polymer; baking to obtain the composite of the graphene and the conducting polymer. According to the invention, the composite is simple in preparation process and can lower sheet resistance obviously after the graphene is transferred; the stability is excellent, that is, even though the composite is placed for a long time, attenuation of the sheet resistance of the graphene is extremely small, and the sheet resistance attenuation ratio of the composite placed for 30 days is less than 10%.

A liquid viscosity detecting method is performed in a liquid droplet ejecting device that includes a piezoelectric type droplet ejecting head to which a drive waveform is applied to pressurize a liquid chamber to eject a liquid droplet, a drive waveform generator to apply the drive waveform to the droplet ejecting head, and a residual vibration detector. The method includes detecting, by the residual vibration detector, amplitude values of multiple cycles of a residual vibration waveform occurring within the liquid chamber after the drive waveform is applied; calculating an attenuation ratio based on the amplitude values; and calculating a liquid viscosity in the liquid chamber based on the attenuation ratio.

While the amplification factor of an external amplifier is increased to raise the minimum volume level, synthesized speech of text data is generated as PCM data. When the PCM data is output for each frame (63 ms), the voltage of a battery power supply is detected and different ATT values (attenuation ratios) are set in accordance with threshold values (Level 1˜4) corresponding to the detected voltage. The lower the power supply voltage, the larger the attenuation ratios. The PCM data is attenuated by such an attenuation ratio to reduce a load to the battery power supply. Even though the battery power supply is exhausted to some extent, no power-down due to an instantaneous increase in power load occurs, with the result that a high-level part of a series of speech data items is output at an adequate volume level that makes a low-level part thereof easy to hear.

The invention relates to a gallium doped solar silicon wafer which is characterized by comprising the following raw materials by weight: 50-80kg of protogenesis polycrystalline silicon and 0.5-2g of 7N high purity gallium. The invention has the advantages that: firstly, a gallium doped solar silicon single crystal rod produced in the invention has uniform transfers and longitudinal resistivity, and the resistance range can be controlled to be 1-4 ohm cm; secondly, the unevenness of central resistance of the head and the tail of the silicon single crystal rod is less than 25 percent; thirdly, the photoinduced attenuation ratio of the monocrystalline silicon piece is generally less than 1 percent; and fourthly, the average photoelectric conversion efficiency is more than 17.4 percent.

The invention relates to the technical field of optical tests, in particular to an external field type infrared radiometer. According to the infrared radiometer, a main convergence mirror is connected with a wave chopper; the wave chopper is connected with a standard reference black body source and light filters; the light filters are connected with neutral attenuation pieces; the neutral attenuation pieces are connected with optical spectrum correcting pieces; the optical spectrum correcting pieces are connected with an infrared detector; a signal acquisition part is connected with the infrared detector and the wave chopper respectively. Through the embodiment, a corresponding optical spectrum curve of a whole system in a measurement waveband can be enabled to be a flat curve through the optical spectrum correcting piece, the linearity and the measurement accuracy of the whole system are improved, and the influence of a radiation spectrum of a tested object on a measurement structure is avoided; the neutral light filters with different attenuation ratios are adopted and the dynamic range of equipment is expanded. Therefore, the equipment has a plurality of ranges and strong and weak radiation targets can be measured.

The invention relates to a spring manufacturing process. The spring manufacturing process comprises the following steps of: reeling a spring, namely reeling a steel wire according to a rotating direction, a preset height, an outer diameter and the number of turns, and tightly compressing the two ends of the spring; tempering, namely putting the spring into a tempering furnace for stress relief tempering; grinding end surfaces, namely grinding the two end surfaces of the spring flatly, wherein the grinding angle is more than 300 degrees; performing shot-blasting for three times, wherein a first-time shot-blasting diameter is greater than a second-time shot-blasting diameter, and the second-time shot-blasting diameter is greater than a third-time shot-blasting diameter; performing creep deformation tempering, compressing the spring to ensure that a positioning length is reached, fixing on a fixture, putting the fixture with the spring into the tempering furnace, preserving the heat, and performing water cooling immediately to reach room temperature after a discharging process; washing; demagnetizing; and performing rust-proof treatment. By the spring manufacturing process, the spring has long service life and is low in thermal attenuation ratio under high stress; and the technical problems of short service life and high thermal attenuation ratios of springs under the high stress existing in the prior art are solved.

A pattern generating section forms two patterns based on a pattern size, an embedding strength, and a pattern attenuation ratio. When corresponding pixels in two patterns are added to each other, all of elements become zero. When all of pixels in each of patterns are added to each other, the added pixels become zero. Each of patterns has two edges, which include discontinuous pixel values and pass through a center portion of each of patterns in difference directions from each other. Absolute values of pixel values of the patterns are the largest at a center thereof. The absolute values of pixel values of the patterns decrease as being away from the center thereof. A pattern selecting section selects one of the two patterns in response to additional information. A pattern superimposing section superimposes the additional information on the image data to embed it into the image data.

An image processing device comprising: a conversion unit to receive a first input signal including first color information, a first color being reproduced at pixels on the basis of the first color information, the first input signal including first color information obtained from an input image signal corresponding to a red component, a green component and a blue component, to specify saturation of the first color, and configured to obtain luminance attenuation ratio on the basis of a relationship previously stored between saturation and luminance attenuation ratio, and the saturation of the first color, and to output a second input signal including second color information whose luminance is decreased from the first color information on the basis of the luminance attenuation ratio corresponding to the first color information; and a signal processing unit configured to output an output signal for driving the pixels on the basis of the second input signal.

The invention provides a display unit brightness correcting method. According to the invention, the method comprises the following steps of: (S1) outputting an all white test chart and observing the all white test chart; (S2) adjusting edge brightness attenuation ratio and central point offset positions of red, green and blue colors; (S3) generating an observing image according to the adjusted edge attenuation ratio of the red, green and blue colors and central point offset of the red, green and blue colors; (S4) comparing whether the effect of an observation chart generated by PC control software is consistent with the effect displayed by the display unit or not; and if so, executing the step 5; and if not so, continuing to execute the step 2; (S5) figuring out the compensation factor ofeach pixel point; and (S6) compensating the value of each pixel point of an input signal according to the compensation factor. According to the invention, the defects of high cost in correcting and debugging the brightness of the display unit, inconvenience for engineer to carry the instrument, difficulties in operation and difference between the debugging effect and human naked eye observation effect in the prior art are overcome.