Apparatus for measuring optical absorption of sample and sample holder applicable to the same
AssigneeNikon Corporation
InventorYoshijiro Ushio
Life of this patent
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Abstract
A present invention is directed to an apparatus which measures the optical absorption of a sample by photoacoustic measurement and has a configuration for improving the reliability and efficiency in this measurement and is directed to a sample holder applicable to this apparatus. In particular, this sample holder has a specific configuration for improving the reproducibility of acoustic propagation conditions.
Claims36
A sample holder applicable to an apparatus which measures an optical absorption of a sample with respect to measurement light having a predetermined wavelength by photoacoustic measurement, said sample holder comprising:
- a holder body having a sample supporting section which saves a predetermined amount of a liquid and supports the sample while a part of the sample is immersed in the liquid, said sample supporting section having an opening through which a part of the sample to be irradiated with the measurement light is placed above a liquid level of the liquid;
- an acoustic sensor for detecting an acoustic signal generated upon a change in volume of the sample occurring due to the optical absorption of the sample irradiated with the measurement light;
- and
- a holding mechanism for directly attaching said acoustic sensor to a predetermined position of said holder body.
A sample holder applicable to an apparatus which measures an optical absorption of a sample with respect to measurement light having a predetermined wavelength by photoacoustic measurement, said sample holder comprising:
- a holder body having a sample supporting section which saves a predetermined amount of a liquid and supports the sample while a part of the sample is immersed in the liquid, said sample supporting section having an opening through which a part of the sample to be irradiated with the measurement light is placed above a liquid level of the liquid;
- a liquid level adjusting mechanism for constantly maintaining the liquid level of the liquid while a part of the sample is immersed in the liquid, said liquid level adjusting mechanism being provided at said holder body;
- and
- a liquid container which is disposed at a predetermined position of said holder body and accommodates, of the liquid saved in said sample supporting section, an unnecessary part of the liquid guided by said liquid level adjusting mechanism.
A sample holder applicable to an apparatus which measures an optical absorption of a sample with respect to measurement light having a predetermined wavelength by photoacoustic measurement, said sample holder comprising:
- a holder body having a sample supporting section which saves a predetermined amount of a liquid and supports the sample while a part of the sample is immersed in the liquid, said sample supporting section having an opening through which a part of the sample to be irradiated with the measurement light is placed above a liquid level of the liquid;
- and
- an acoustic sensor for detecting an acoustic signal generated upon a change in volume of the sample occurring due to the optical absorption of the sample irradiated with the measurement light, said acoustic sensor directly attached to said holder body by a adhesive,
- wherein said holder body is made of a material having a remarkably higher acoustic impedance than the liquid having an acoustic impedance within the range of 1.0.times.10.sup.6 to 1.5.times.10.sup.6 N.s.m .sup.-3.
Dependencies are inferred from the claim text.